Hamilton Sundstrand Company Gas Fuel Metering Valve Hfg2 0 Users Manual This Provides Installation, Maintenance, And Operating Instructions For The ACT2000 All Electric Actuator

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User Manual

HFG2.0 Gas Fuel Metering Valve

SD-6009 Rev. 6

August 2008

PRECISION ENGINE CONTROLS CORPORATION

This manual provides installation, maintenance, and operating instructions for the HFG2.0

Gas Fuel Metering Valve.

Every attempt has been made to provide sufficient information in this manual for the

proper operation and preventive maintenance of the valve. Read this manual in its

entirety to fully understand the system.

Operating the HFG2.0 Gas Fuel Metering Valve in accordance with instructions herein

ensures long term and reliable operation.

If you need additional information, please contact:

Precision Engine Controls Corporation

11661 Sorrento Valley Road

San Diego, California 92121

(858) 792-3217 • (800) 200-4404

Fax: (858) 792-3200

E-mail: peccntl@precisioneng.com

© 2006 PRECISION ENGINE CONTROLS CORPORATION. ALL RIGHTS RESERVED

TABLE OF CONTENTS

Purpose of This Guide ................................................................................................................................... iii

Product Identification...................................................................................................................................... iii

What the User Should Know ......................................................................................................................... iv

Related Publications....................................................................................................................................... iv

1 INSTALLING THE HFG2.0 ........................................................................................................................ 1

1.1 Before Beginning..................................................................................................................................... 1

1.2 General Specification Summary............................................................................................................. 3

1.3 Mechanical Installation............................................................................................................................ 4

1.4 Electrical Connections............................................................................................................................. 14

2 UNDERSTANDING THE HFG2.0 ............................................................................................................. 25

2.1 System Description ................................................................................................................................. 25

2.2 Electrical Description............................................................................................................................... 26

2.3 Mechanical Description........................................................................................................................... 30

2.4 Identification Plate ................................................................................................................................... 36

3 OPERATING THE HFG2.0........................................................................................................................ 39

3.1 Powering Up ............................................................................................................................................ 39

3.2 Finding Home Position............................................................................................................................ 39

3.3 Holding Motor Current State................................................................................................................... 40

3.4 Moving to Stop Position .......................................................................................................................... 42

3.5 Controlling Motion ................................................................................................................................... 42

3.6 Resetting the Actuator............................................................................................................................. 44

3.7 Monitoring System Health....................................................................................................................... 45

3.8 Changing Set-Up Parameters ................................................................................................................ 50

4 MAINTAINING THE HFG2.0 ..................................................................................................................... 53

4.1 Refurbishment ......................................................................................................................................... 53

5 TROUBLESHOOTING............................................................................................................................... 55

5.1 FAULT File............................................................................................................................................... 59

APPENDIX A: DECOMMISSIONING & DISPOSAL ...................................................................................... 61

APPENDIX B: GLOSSARY ............................................................................................................................. 63

LIST OF FIGURES

Figure 1-1. Typical HFG2.0 Gas Fuel System Installation ................................................. 5

Figure 1-2. Alternate HFG2.0 Gas Fuel System Installation ..............................................5

Figure 1-3. HFG2.0 Dimensions, 3-Piece Housing ............................................................ 8

Figure 1-4. HFG2.0 Dimensions, 1-Piece Housing ............................................................ 9

Figure 1-5. HFG2.0 Mounting Orientations .......................................................................10

Figure 1-6. HFG2.0 Mounting Provisions, 3-Piece Housing (Standard Mounting) .........11

Figure 1-7. HFG2.0 Mounting Provisions, 1-Piece Housing (Standard Mounting) .........12

Figure 1-8. HFG2.0 Mounting Provisions, 1-Piece Housing (Reversed Mounting) ........13

Figure 1-9: HFG2.0 System Power Wiring Diagram ........................................................15

Figure 1-10. Typical Power Connection With Power Supply ...........................................15

INSTALLING THE HFG2.0 i

ii HFG2.0 USER GUIDE

Figure 1-11. Typical Power Connection With Battery.......................................................15

Figure 1-12: HFG2.0 System Signal Wiring Diagram......................................................19

Figure 1-13. Typical Analog Input Connection..................................................................20

Figure 1-14. Typical Analog Output Connection ...............................................................20

Figure 1-15. Typical Discrete Input Command Connection .............................................20

Figure 1-16. Typical Discrete Output Alarm Connections ................................................21

Figure 1-17. Typical RS232 Serial Interface Connection .................................................21

Figure 2-1. HFG2.0 Electronics System Block Diagram ..................................................28

Figure 2-2. HFG2.0 Cut-Away View – Actuator Main Housing Assembly.......................34

Figure 2-3. HFG2.0 Cut-Away View (Partial) ....................................................................35

Figure 2-4. Typical Identification Plate...............................................................................36

Figure 2-5. Typical Refurbishment Plate ...........................................................................37

Figure 3-1. HFG2.0 Basic Operation Flow Chart..............................................................41

Figure 3-2. HFG2.0 Actuator Position vs. DEMAND ........................................................43

Figure 3-3. Dead Band of Actuator, Position vs. DEMAND Curve ..................................44

LIST OF TABLES

Table 1-1. Wire List for HFG2.0 Power Harness ..............................................................14

Table 1-2. Power Supply Requirements............................................................................16

Table 1-3. Wire Size for HFG2.0 Power Harness.............................................................17

Table 1-4. Wire List for HFG2.0 System Signal Harness .................................................18

Table 1-5. Computer COM Port Pin Outs .........................................................................22

Table 1-6. Wire Size for HFG2.0 Signal Harness .............................................................23

Table 3-1. Default Configuration For FAULT Alarm ..................................................47

Table 3-2. Default Configuration For OVERTEMP Alarm .........................................47

Table 3-3. Fault Configuration For FAULT Alarm ...........................................48

Table 3-4. Fault Configuration For OVERTEMP Alarm ..................................49

Table 3-5. Typical HFG2.0 Setup Parameters With Default Values................................51

Table 5-1. Initial Installation Troubleshooting Chart..........................................................57

Table 5-2. HFG2.0 In-Service Troubleshooting Chart......................................................57

Table 5-3. HFG2.0 Electrical Continuity Troubleshooting Chart ......................................58

Purpose of This Guide

This publication is designed to help the user install, operate, maintain and

troubleshoot the HFG2.0 Gas Fuel Metering Valve.

Product Identification

Most of the information in this manual is applicable to all generations of

the product. Where unique information applies to a specific generation,

one of the following symbols will be shown to indicate as such:

Fourth generation (isolated RS-232)

P/Ns: 5002605-XXX, 5002610-XXX, 5002447-XXX or:

Any Remanufactured Part with Config 116 and above

Configuration: 116 and above

Firmware version: 3.00 and above

Third generation (isolated RS-232)

P/Ns: 5002605-XXX, 5002610-XXX, 5002447-XXX or:

Any Remanufactured Part with Config 109 and DP 1028

Any Remanufactured Part with Config 110 and above

Configuration: 110 and above

Firmware version: 2.02 and above

Second generation (non-isolated RS-232)

P/Ns: 5002605-XXX, 5002610-XXX, 5002447-XXX

Configuration: between 105 and 108

Firmware versions: 2.0, 2.1

First generation (non-isolated RS-232)

P/Ns: 50024XX-XXX

Configuration: earlier than 105

Firmware versions: 1.00, 1.01

INSTALLING THE HFG2.0 iii

iv HFG2.0 USER GUIDE

What the User Should Know

To install, operate and troubleshoot the HFG2.0, it is necessary for the

user to have a fundamental understanding of:

• Electronics concepts, such as voltage, current, and switches

• Mechanical motion control concepts, such as inertia, torque,

velocity, distance, force

Related Publications

• ActWiz Software Operations Manual (p/n SD-6010)

1 INSTALLING THE HFG2.0

1.1 Before Beginning

Inspection

The HFG2.0 should be inspected immediately after unpacking. Check for

dings or dents or any other obvious signs of damage. Remove the

protective caps from the connectors and check for any bent pins or

damage to the threads of the connectors. Examine the wires of the signal

and power harnesses for any signs of damage to the wire insulation.

In the event that any damage is detected, contact PECC for instructions

about how to proceed.

Note: Retain the actuator’s original shipping container. In the

event of future transportation requirements, this container

will minimize any damage during shipment.

Recommended Installation Process

Users must determine if it is best to couple the HFG2.0 to the load before

or after the installation has been tested.

• Review the general specifications

• Mechanically connect the clevis of the HFG2.0

• Mechanically mount the valve body of the HFG2.0

• Mechanically connect the input pipe of the HFG2.0

• Mechanically connect the output pipe of the HFG2.0

• Connect Case Ground of the HFG2.0 to System Ground

• Connect the 4-wire Power Harness of the HFG2.0 to the user’s

power supply or battery

• Connect the 17-wire Signal Harness of the HFG2.0 to the user’s

controller

• Test the installation

INSTALLING THE HFG2.0 1

2 HFG2.0 USER GUIDE

Electrical Noise Guidelines

PECC has taken the following measures to reduce electrical noise with

the HFG2.0:

• High-voltage wires are routed separately from low-level signals

through the use of separate power and signal harnesses.

An additional measure to reduce electrical noise is to:

• Ensure that the HFG2.0 is properly grounded, as per Section 1.4

of this manual.

Environmental Considerations

The HFG2.0 operates satisfactorily with ambient air temperature of -40 °C

(-40 °F) to +93 °C (+200 °F), and is designed as an explosion-proof

assembly. The HFG2.0 enclosure is Canadian Standards Association

(CSA) Type 3, European IP65.

CAUTION

Solvent/water may enter the electronics area during a high-pressure

wash, which can cause decreased performance or failure of the unit.

1.2 General Specification Summary

PARAMETER VALUE

Power Input

Voltage Range 80-160 VDC; 120 VDC nominal

Maximum Current 20 A

Typical Transient Current +20A < 60ms; +10A < 120ms; -5A < 100ms

Typical Continuous Current < 1A

Inputs and Outputs

Discrete Inputs

RUN and RESET commands

ON Voltage: 12 – 32 VDC,

+24 VDC nominal @ 6.5 mA

OFF Voltage: 1.0 VDC, maximum

Discrete Outputs

FAULT & OVERTEMP alarms

OFF Voltage: 32 VDC maximum @ 150 µA typical

Effective ON Resistance 1.1 kΏ, nominal

@ ≥ 1.5 VDC:

Analog Input

DEMAND command signal

Current: 4 to 20 mA; 25 mA Maximum

Voltage: 5 VDC Maximum

Internal Impedance: 200 Ώ

Analog Outputs

POSITION & MTR CURRENT feedback

Current: 4 to 20 mA

External Load Resistance: 300 Ώ, Maximum

Maximum Common Mode Voltage ±200 VDC User I/O to 120 VDC Return (less serial interface)

Performance All performance values are based on use with HFG2.0 in default configuration.

Any changes to HFG2.0 firmware settings to change stroke profile will alter

performance values.

Maximum Operating Pressure 500 psig

Proof Pressure 2000 psig

Minimum Controllable Flow (Natural Gas) 15 pph (configuration dependent)

Maximum Controllable Flow 30,000 pph (configuration dependent)

Step Response (10% to 90%) 100 ms

Flow Accuracy ± 5% of flow point, typical

Mean Time Before Unscheduled Removal 30,000 Hours

Life Cycles 32,000 Minimum

Environmental

Temperature, Operating Ambient: -40° C (-40° F) to +93° C (+200° F)

Temperature, Operating Fuel: -40° C (-40° F) to +125° C (+257° F)

Temperature, Storage -40° C (-40° F) to +125° C (+257° F)

Environmental Rating Rated to CSA Type 3 and European IP65

Sealed against dust, protected against water

EMC Meets EN 50081-2 and EN50082-2 for DC powered industrial equipment

Vibration Meets Mil-Std-810E, Category 4 (5 – 2000 Hz)

INSTALLING THE HFG2.0 3

4 HFG2.0 USER GUIDE

Certifications

North American Certifications CSA Class I, Div 1, Group B, C, D; T4

European Directive Compliance (CE Mark)

EEx d, IIB+H2; T4

97/23/EC Pressure Equipment Directive (PED)

94/9/EC Potentially Explosive Atmospheres (ATEX) 02ATEX6051X

98/37/EC Machinery Directive

89/336/EEC Electromagnetic Compatibility Directive (EMC)

Materials

Actuator Housing 6061-T6 Anodized Aluminum

Valve Housing 6061-T6 Anodized Aluminum

316 Stainless Steel (Optional)

Conduit Union Zinc Plated Steel

Seals Viton and Teflon

Connectors Aluminum

Dimensions 9.7 in x7.7 in x 25.4 in

Weight 100 lbs. Max (Aluminum Valve Housing, 3-piece)

85 lbs. Max (Aluminum Valve Housing, 1-piece)

190 lbs. Max (Stainless Steel Valve Housing, 3 piece)

1.3 Mechanical Installation

This section describes proper HFG2.0 installation. Ensure compliance

with the factory recommendations.

Typical Fuel System

The HFG2.0 installs as part of a gas fuel system as shown in Figure 1-1.

In this arrangement, the HFG2.0 is located downstream from two

normally closed gas shut-off valves.

An alternate arrangement is shown in Figure 1-2. In this installation, the

HFG2.0 is located between two normally closed gas shut-off valves.

Fuel Filtering

For efficient valve operation, filter the fuel through a 40-micron absolute

filter before it reaches the valve. This extends the time between routine

maintenance. Locate the fuel filter as close as possible to the valve

INLET.

Figure 1-1. Typical HFG2.0 Gas Fuel System Installation

Figure 1-2. Alternate HFG2.0 Gas Fuel System Installation

Dimensions

Figure 1-3 and Figure 1-4 show external dimensions for the 3-piece

housing and 1-piece housing versions of the HFG2.0, respectively.

Mounting Considerations

The HFG2.0 can be mounted directly to a gas turbine engine skid using

brackets provided by the engine manufacturer. The HFG2.0 can be

mounted with any directional orientation, whether horizontal, vertical, or at

an angle. The clevis must be supported if the HFG2.0 is mounted

horizontally.

Valve life can be maximized if the HFG2.0 is mounted with the vertical

orientation shown in Figure 1-3 or Figure 1-4, where the valve end is on

the bottom. The drain hole is most effective when mounted in this vertical

orientation.

Note: The one-piece housing version of the HFG2.0 does not

have a drain hole.

INSTALLING THE HFG2.0 5

6 HFG2.0 USER GUIDE

The HFG2.0 includes four (4) 0.50-24 UNC-2B mounting holes with

stainless steel heli-coil inserts for securing the valve body. The mounting

holes on the standard version of the HFG2.0 are located on the opposite

side from the electrical connectors. The mounting holes on the reversed

version of the HFG2.0 are located on the same side as the electrical

connectors (see Figure 1-5).

Figure 1-6 shows mounting provisions for the 3-piece housing version of

the HFG2.0. Figure 1-7 and Figure 1-8 show mounting provisions for the

1-piece housing version of the HFG2.0.

Note: Provide adequate clearance to the OUTLET port to facilitate

cleaning.

Lifting Considerations

The aluminum body HFG2.0 weighs approximately 100 lbs. The stainless

steel body HFG2.0 weighs approximately 190 lbs. PECC recommends

using the 0.375-inch diameter clevis to lift the valve, in conjunction with

the appropriate lifting equipment.

Note: The clevis exceeds the Factor of Safety (FOS) requirement

of 3, based on component yield strength, per ASME B30.20-

1999.

WARNING

Lifting Hazard – Do not attempt to hand-lift the actuator. Use

appropriate lifting equipment.

Connecting the Clevis

The clevis can be used to secure the actuator end of the HFG2.0. A high-

strength shoulder bolt (0.375” diameter) is recommended to fasten the

clevis to a user-provided mount bracket.

The clevis can be rotated to any orientation to support installation. Loosen

the four retaining screws and rotate to the desired angle. The screw

pattern can be indexed ± 45 degrees to provide additional adjustment.

When adjustments are complete, torque the four retaining screws to

117-138 in-lbs.

WARNING

Explosion Hazard – Do not remove the clevis. Removing the clevis

violates the warranty.

Care should also be taken when rotating the clevis or indexing the

screw pattern to avoid scratching the flame path or introducing

particulates to the assembly.

Pipe Connections

The standard pipe connection for the HFG2.0 is per SAE J518, -32

(2 inch), code 61. The valve bodies contain locking helical inserts. Contact

Precision Engine Controls for other connection options.

Note: To maintain flow control accuracy, ten-(10) pipe diameters

(15 inches) straight length minimum is recommended

upstream and downstream.

Flange Bolts

Precision Engine Controls Corporation recommends SAE Grade 5 or

better flange bolts. Torque to 650 – 800 in-lb.

CAUTION

Do not over-torque fittings. Over-torque may result in stripped

threads and/or helical insert damage.

Drain Plug

PECC recommends 60 – 65 in-lb of torque for the drain plug (see

Figure 1-6, View B-B).

Note: The one-piece housing version of the HFG2.0 does not

have a drain hole.

INSTALLING THE HFG2.0 7

8 HFG2.0 USER GUIDE

Vent Port

The gas leakage rate through the vent port is less than 200 cm3/hr (air or

N2 as test flow). The vent port features a 1/8-NPT fitting. See Figure 1-4.

Consult local installation codes to determine whether and how to connect

this port.

Figure 1-3. HFG2.0 Dimensions, 3-Piece Housing

Figure 1-4. HFG2.0 Dimensions, 1-Piece Housing

INSTALLING THE HFG2.0 9

10 HFG2.0 USER GUIDE

Figure 1-5. HFG2.0 Mounting Orientations

Figure 1-6. HFG2.0 Mounting Provisions, 3-Piece Housing

(Standard Mounting Orientation Shown)

INSTALLING THE HFG2.0 11

12 HFG2.0 USER GUIDE

Figure 1-7. HFG2.0 Mounting Provisions, 1-Piece Housing

(Standard Mounting Orientation Shown)

Figure 1-8. HFG2.0 Mounting Provisions, 1-Piece Housing

(Reversed Mounting Orientation Shown)

INSTALLING THE HFG2.0 13

14 HFG2.0 USER GUIDE

1.4 Electrical Connections

The HFG2.0 is suitable for use in hazardous locations. See the General

Specification Summary in Section 1.2 for certifications. Ensure compliance

with the factory recommendations, and that wiring is in accordance with

local requirements.

WARNING:

94/9/EC (ATEX) Compliance – Special Conditions for Safe Use:

Two special factory-sealed unions are mounted on the equipment to

ensure the electrical connection to the network and to provide the

feedback signal to the user.

The installation of these devices and the final connections to the

conduit shall comply with the requirements of the European

standards.

Ground Connection

The case of the HFG2.0 features a threaded hole (0.250-20 UNC-2B

female thread) that is dedicated for the ground connection. This hole has

been left unpainted and uncoated to ensure a good electrical contact.

This threaded hole is located on the clevis end of the unit, (see

Figure 1-6, Figure 1-7 or Figure 1-8). Use a screw with a 0.250-20 UNC-

2A thread to connect the case of the HFG2.0 to the same ground plane

as the user’s controller.

Power Connections

The HFG2.0 operates on a 120VDC (nominal), user-provided input

voltage, which is supplied to the unit through the integral four-wire power

harness. See Table 1-1 for the wire list for the HFG2.0 power harness.

See Figure 1-9 for the HFG2.0 system power wiring diagram. See Figure

1-10 for a typical power connection with a power supply. See Figure 1-11

for a typical power connection with a battery.

WIRE COLOR FUNCTION AWG

RED Power 14

WHITE/RED Power (AUX) 14

GREEN Power Return 14

WHITE/GREEN Power Return (AUX) 14

Table 1-1. Wire List for HFG2.0 Power Harness

Figure 1-9: HFG2.0 System Power Wiring Diagram

Figure 1-10. Typical Power Connection With Power Supply

Figure 1-11. Typical Power Connection With Battery

WARNING - Shock Hazard

Connect both the 120 VDC power and auxiliary wires. If only the

primary power wires are connected, the 120 VDC auxiliary power

wires are electrically live and must be insulated on the ends.

INSTALLING THE HFG2.0 15

16 HFG2.0 USER GUIDE

Note: A battery system is recommended for highest reliability.

Note: If a 120 VDC power supply is used rather than a battery,

ensure an output capacitance of at least 12,000 µF, which

can both sink and source electric current. See Power

Supply Requirements (Table 1-2).

Note: Use a separate conduit for the power wiring. This prevents

noise pickup and transmission from ancillary equipment,

which could cause instability in the actuator.

Power Supply Requirements

Table 1-2 below lists the power supply requirements for the HFG2.0.

PARAMETER VALUE

Voltage

Nominal

Range

120 VDC

80 – 160 VDC

Max. Ripple 4 VAC RMS or 12 VAC p-p

Current

Maximum

Continuous , Typical

Transient, Typical

20 Amps

<1 Amp

+20 A <60 ms

+10 A <600 ms

-5 A <100 ms

*Output Capacitance 12,000 µF (typical)

Table 1-2. Power Supply Requirements

*The output capacitance applies for non-battery power systems and assumes full-stroke step

changes in actuator position at rated load. This value is typical. The actual value required is

dependent on the user’s specific DC power system design, including:

• Power sources used in the DC power system (their output impedance, transient response,

rating, diode decoupling [if any], topology, etc.)

• All electrical loads and components connected to each respective power bus branch

• Switching relationships of these electrical loads and components to each other (for example,

does a large motor and actuator turn off at about the same time, etc.)

• Bus branch conductor length and arrangement (flat bus bars, round cables, twisted, etc.)

Therefore, it is not possible to correctly state a single capacitance value that should be placed on

the bus. It may require no added bus capacitance or hundreds of thousands of microfarads of

capacitance. A typical output capacitance value used for non-battery power systems is 50,000uF,

but the actual value depends on the specific power system as discussed above.

It is best to test the power system for adequate capacitance by executing full-stroke step changes

with the actuator at the same time as all other devices on the bus are switched and measuring the

bus voltage at the actuator power input point to verify that it does not dip below the minimum or

exceed the maximum bus voltage specifications. This test should be performed at both the

minimum and maximum expected operating voltages

Also, the output capacitance should be carefully positioned so that it is never disconnected from

the HFG2.0 power input during any contact or switching operations.

Recommended Wiring for System Power

The recommended wire for connecting to system power is a two-

conductor shielded cable containing twisted-pair wires with individual

shields. Use a wire size large enough to accommodate the installation

and provide a maximum one (1) ohm loop resistance. See Table 1-3

(below) for recommended wire sizes.

DISTANCE TO

USER POWER

RECOMMENDED WIRE SIZE

(Minimum)

≤ 500 ft. AWG 10, stranded

> 500 ft. Consult Factory

Table 1-3. Wire Size for HFG2.0 Power Harness

WARNING

Explosion Hazard – Do not connect or disconnect while circuit is

live. For US Group B hazardous locations, an explosion proof seal

must be placed within 18 inches.

CAUTION

Disconnect all HFG2.0 connections prior to welding.

INSTALLING THE HFG2.0 17

18 HFG2.0 USER GUIDE

Signal Connections

Signals are sent between the HFG2.0 and the user’s controller through

the integral 17-wire signal harness. See Table 1-4 for the wire list for this

harness. See Figure 1-12 for the system signal wiring diagram.

WIRE COLOR FUNCTION AWG

WHITE/ORANGE/YELLOW Serial/RX In 20

WHITE/ORANGE/BLUE Serial/TX Out 20

WHITE/ORANGE/GREEN Serial RETURN 20

BLACK OVER TEMP Alarm 20

WHITE/BLACK OVER TEMP Alarm RETURN 20

ORANGE FAULT Alarm 20

WHITE/ORANGE FAULT Alarm RETURN 20

VIOLET RUN Command 20

WHITE/VIOLET RUN Command RETURN 20

GRAY RESET Command 20

WHITE/GRAY RESET Command RETURN 20

BROWN Position Demand 20

WHITE/BROWN Position Demand RETURN 20

YELLOW Position Feedback 20

WHITE/YELLOW Position Feedback RETURN 20

BLUE Motor Current 20

WHITE/BLUE Motor Current RETURN 20

Table 1-4. Wire List for HFG2.0 System Signal Harness

Figure 1-12: HFG2.0 System Signal Wiring Diagram

Note: For proper operation of the controller, the voltage between

the control inputs and the negative terminal of the power

supply should be below 200 VDC.

Note: The Serial Return is internally connected to the 120 VDC

input Return.

INSTALLING THE HFG2.0 19

20 HFG2.0 USER GUIDE

Analog Inputs

The analog input, DEMAND, has a current range of 4 - 20 mA. It is

electrically isolated up to 500 VAC from the enclosure, 120 VDC power,

digital I/O, and serial interface. The analog interfaces are not isolated from

each other. See Figure 1-13 for a typical analog input connection.

HFG2.0 4-20mA INPUT CONTROLLER 4-20 mA OUTPUT

+

-

DEMAND [BRN]

DEMAND RTN [WHT/BRN]

20 0

Ω

+

-

Figure 1-13. Typical Analog Input Connection

Analog Outputs

The analog outputs, MOTOR CURRENT and POSITION, have a current

range of 4 - 20 mA. They are electrically isolated up to 500 VAC from the

enclosure, 120 VDC power, digital I/O, and serial interface. The analog

interfaces are not isolated from each other. See Figure 1-14 for a typical

analog output connection.

CO NTROLLER 4-20mA INPUT HFG2.0 4-20mA OUTPUT

+

-

PO SIT ION [Y EL]

MTR CURRENT [BLU]

PO SIT ION RT N [W HT /YEL ]

MTR CURRENT RTN [W HT /BLU]

<500Ω

+

-

Figure 1-14. Typical Analog Output Connection

Discrete Inputs

The discrete inputs are 24 VDC ON (High) and 0 VDC OFF (Low). They

are electrically isolated up to 500 VAC. See Figure 1-15 for a typical

discrete input connection.

CONTROLLER DISCR ETE OUTPUT

HFG2.0 DISCRET E INPUT

RUN RTN [WHT/VIO]

RESET RTN [WHTGRY]

RUN [VIO]

RESET [GRY]

Figure 1-15. Typical Discrete Input Command Connection

Discrete Outputs

The discrete outputs are +24 VDC. They are electrically isolated up to 500

VAC. See Figure 1-16 for a typical discrete output alarm connection.

CONTROLLER DISCRETE INPUT

HFG2.0 DISCRETE OUTPUT

FAULT RTN [WH T/ORN]

OVERTEMP RTN [WH T/BLK]

FAULT ALARM [ORN]

OVERTEMP ALARM [BLK]

CONTROLLER DISCRETE INPUT HFG2.0 DISCRETE OUTPUT

FAULT ALARM [ORN]

OVERTEMP ALARM [BLK]

FAULT RTN [WHT/ORN]

OVERTEMP ALARM RTN [WHT/BLK]

Figure 1-16. Typical Discrete Output Alarm Connections

RS232 Serial Communications Interface

Signal levels for the serial communications input and output are per

RS232 standards. See Figure 1-17 for a typical RS232 serial interface

connection. See Table 1-5 for computer COM port pin-outs for RS232.

Figure 1-17. Typical RS232 Serial Interface Connection

INSTALLING THE HFG2.0 21

22 HFG2.0 USER GUIDE

FUNCTION Standard 9-Pin

COM Port

Standard 25-Pin

COM Port

Transmit (Tx). Pin 3 Pin 2

Receive (Rx) Pin 2 Pin 3

Ground (GND) Pin 5 Pin 7

Table 1-5. Computer COM Port Pin Outs

WARNING

Property Damage Hazard – The serial inputs are not electrically

isolated . Failure to properly isolate the user serial interface

could result in actuator or computer damage. Use separate

conduits for power and signal wiring. Close proximity to power lines

may cause signal interference.

Shock Hazard – The serial inputs are not electrically isolated .

If the power input is floating (not grounded), the serial input

connections may have up to 120 VDC present.

Property Damage Hazard – DO NOT connect 24 VDC power to any of

the serial interface connections.

Note: The pin designations shown in Table 1-5 are for the COM

port on the computer. Make sure that the wiring to the

COM port mating connector correctly matches Transmit

from the HFG2.0 to Receive on the computer’s COM port,

and vice versa.

Note: The maximum distance for serial connections is 50 ft. This

will typically only allow for local interface with a laptop PC.

Note: The serial interface connections are not isolated .

Isolation must be provided when connecting to a computer.

Recommended Wiring for System Signals

The recommended wiring is a 17-conductor shielded cable containing

twisted-pair wires with individual shields. Use a wire size large enough to

accommodate the installation and provide a maximum fifty (50) ohm loop

resistance. See Table 1-6 for recommended wire sizes.

DISTANCE TO USER’S

CONTROLLER

RECOMMENDED

WIRE SIZE

(Minimum)

≤ 1000 ft. AWG 18, stranded

> 1000 ft. Consult Factory

Table 1-6. Wire Size for HFG2.0 Signal Harness

Note: Use a separate conduit for the signal wiring. This prevents

noise pickup and transmission from ancillary equipment,

which could cause instability in the actuator. If conduit is not

used, signal wires should be at least 4-6 inches from any

other wires.

Ensure that all shielded cables are twisted conductor pairs with either a

foil or braided shield. PECC recommends Belden 8719 shielded twisted-

pair audio, broadcast and instrumentation cable. All signal lines should be

shielded to prevent picking up stray signals. Connect shields as shown in

Figure 1-12. Wire exposed beyond the shield should be as short as

possible.

CAUTION

This valve is 89/339/EEC EMC Directive compliant (CE mark) using

watertight, flexible conduit (plastic over steel) and Belden 8719

shielded, twisted pair-audio, broadcast and instrumentation cable.

Use of other conduit or wire invalidates EMC Directive compliance.

Do not connect 24 VDC power without current limiting (25 mA)

across digital or analog outputs.

INSTALLING THE HFG2.0 23

24 HFG2.0 USER GUIDE

INTENTIONALLY BLANK

2 UNDERSTANDING THE HFG2.0

2.1 System Description

The HFG2.0 is an electrically operated gas fuel-metering valve that

requires only 120 VDC power, an analog fuel demand signal, and a

discrete RUN command to achieve basic operational capability. No

pneumatic or hydraulic power is required.

The HFG2.0 is a closed loop servo system containing Motor Control

Electronics (MCE), a brushless DC-motor-driven ball screw actuator and

valve flow body assembly. The valve closes its own control loop on a

position feedback signal from an internal resolver. Thus, the valve

continuously modulates its position and provides precise fuel metering.

Gas fuel enters the valve flow body assembly INLET port. The fuel flow is

evenly split via a contamination deflector and pressure-balanced orifice

assembly as it enters the INLET port chamber. The orifice assembly

contains a set of poppets and control orifices. As the valve actuator

retracts, the poppet assembly exposes fuel from the INLET port chamber

to the two orifices. The fuel flows through in the annulus between each

poppet and fixed orifice and recombines in the OUTLET port chamber.

The fuel exits through the OUTLET port.

Flow is metered between the poppets and control orifices in proportion to

the poppet position and resultant flow area. The flow area ranges from

zero with a Demand signal at 0 % of its range to maximum with a

Demand signal at 100% of its range. The orifices contain pressure-

energized soft seats and metal-to-metal hard seats, which provide a leak-

tight seal when the poppets are in a closed position.

A pre-loaded, fail-safe spring is located between the valve housing and

poppet assembly. The spring load increases as the valve opens. If a

power failure occurs, the spring causes the poppets to return to the soft

seats, thereby closing the valve.

WARNING

The soft seats are unidirectional and will leak if the OUTLET is more

than 50 psi greater than the INLET. PECC recommends that the

INLET port pressure always be ≥ to the OUTLET port pressure.

CH. 2: UNDERSTANDING THE HFG2.0 25

26 HFG2.0 USER GUIDE

2.2 Electrical Description

The electric actuator in the HFG2.0 incorporates digital motor control

electronics (MCE). The MCE contain analog to digital converters, a digital

signal processor (DSP), application specific integrated circuit (ASIC) and

power supplies. Figure 2-1 shows the system block diagram.

The MCE provides the interface for the user’s engine control system and

power supply. The MCE incorporates analog and discrete inputs and

outputs, and a serial interface. The MCE provides signal conditioning for

all external analog and discrete I/O, as well as internal resolver and

thermistor inputs.

Note: The MCE analog and discrete signal interfaces are

electrically isolated. The serial communication interface is

optically isolated

The MCE internally interfaces with the brushless DC motor, resolver and

thermistors. The MCE performs all necessary commutation, control and

status monitoring for the HFG2.0.

Power

The HFG2.0 operates on an input voltage of 120 VDC (nominal) that is

provided by the user via an integral four-wire power harness. Refer to

Figure 1-10 or 1-11 for a typical connection. Refer to the General

Specification Summary Table in Section 1.2 for load specification values.

Control Signals

The HFG2.0 accepts three two-wire external control signals via the

integral 17-wire signal harness. Refer to Figures 1-13 and 1-15 for typical

connections. Refer to the General Specification Summary Table in

Section 1.2 for signal specification values.

RUN Command

The user-provided RUN command is a discrete input. The RUN

command must be ON to enable the HFG2.0 to perform the homing

sequence after resetting or powering up. The RUN command also

enables the HFG2.0 to track the DEMAND signal. The valve will move to

the Stop Position if the RUN command is set to OFF or lost.

RESET Command

The RESET command is a user-provided discrete input to the HFG2.0.

This command causes the HFG2.0 to reset all internal position indicators,

reload all set-up parameters, and to then move the valve through its initial

homing sequence again. (The RUN command must be set to ON before

the homing sequence can begin.) RUN and DEMAND inputs are ignored

during the RESET command. To reset the HFG2.0, +24 VDC must be

applied across the RESET wires for at least 0.5 seconds in order to reset

the controller and actuator.

DEMAND Signal

The DEMAND signal is a user-provided analog input that is used to

control the position of the valve. The current level of the DEMAND signal

is correlated to the position of the valve within its range. The minimum

Demand signal of 4.0 mA is correlated to the CLOSED (Home) position.

The maximum Demand signal of 20 mA is correlated to the OPEN

(maximum flow) position.

Feedback Signals

The HFG2.0 provides two two-wire feedback signals via the integral

17-wire signal harness. Refer to Figure 1-14 for typical connections. Refer

to the General Specification Summary Table in Section 1.2 for feedback

specification values.

Position Feedback

The HFG2.0 provides analog valve position feedback to the user. This

internally-generated feedback signal is proportional to the valve position.

A signal level of 4 mA represents that the valve is at its CLOSED (Home)

position; while a signal level of 20 mA represents that the valve is at its

maximum span.

Motor Current Feedback

The HFG2.0 provides motor current feedback. This internally-generated

feedback signal is proportional to actuator load. A signal level of 4 mA

represents no load on the actuator; while a signal level of 20 mA is the

maximum load.

CH. 2: UNDERSTANDING THE HFG2.0 27

28 HFG2.0 USER GUIDE

Figure 2-1. HFG2.0 Electronics System Block Diagram

Alarms

The HFG2.0 provides two two-wire alarm signals via the integral 17-wire

signal harness. The discrete alarm outputs are solid-state switches which

are normally closed. The user’s controller provides +24 VDC to complete

the circuit. Refer to Figure 1-16 for typical connections. Refer to the

General Specification Summary Table in Section 1.2 for alarm

specification values. See Section 3.7 for additional details about alarms.

FAULT Alarm

The fault configuration for the FAULT alarm is programmable in the most

recent generation of the HFG2.0 (factory-configurable only). If a fault

condition occurs, the FAULT alarm switch will open, interrupting the circuit

with the user’s controller. See Table 3-1 for the default configuration .

See Table 3-3 for a list of fault conditions represented by the FAULT

alarm in earlier generations of the HFG2.0.

OVERTEMP Alarm

The fault configuration for the OVERTEMP alarm is programmable in the

most recent generation of the HFG2.0 (factory-configurable only). If a

fault condition occurs, the OVERTEMP alarm switch will open,

interrupting the circuit with the user’s controller. The default configuration

for the OVERTEMP alarm is Motor OVERTEMP, where the circuit will

open if the temperature in two or more of the motor winding exceeds

135°C. See Table 3-2 for details about the default configuration .

In earlier generations of the HFG2.0, the OVERTEMP alarm is dedicated

to Motor Over Temp and Electronics Over Temp faults. If

the HFG2.0 detects that the temperature in two or more of the motor

windings exceeds 130° C or the electronics temperature

exceeds 110° C the OVERTEMP circuit will open (see Table 3-4).

In generation , the Electronics Over Temp fault is assigned to the

FAULT alarm. If the electronics temperature exceeds 110° C the

FAULT circuit will open (see Table 3-3).

RS232 Communications

The HFG2.0 allows for RS232 serial communication through three wires

in the integral 17-wire signal harness. The RS232 wires, Rx IN, Serial Tx

OUT and Serial RTN, are used to communicate with a user-provided

computer. Serial communication can be used to change the HFG2.0 set-

up parameters and to retrieve fault diagnostics. Contact Precision Engine

Controls Corporation to request fault diagnostic software. See Section 3.8

for additional details about set-up parameters.

CH. 2: UNDERSTANDING THE HFG2.0 29

30 HFG2.0 USER GUIDE

Note: The MCE analog and discrete signal interfaces are

electrically isolated. The serial communication interface is

optically isolated

2.3 Mechanical Description

The HFG2.0 consists of two main parts, an actuator and a valve

assembly.

Actuator

The actuator is the primary drive mechanism for the valve assembly. The

actuator portion of the HFG2.0 consists of four main assemblies:

• Main Housing Assembly

• Brushless DC Motor Assembly

• Resolver Assembly

• Linear Drive Mechanism

Main Housing Assembly

The main housing assembly consists of the main housing, motor cover,

extension-rod bearing, and associated seals. The main housing assembly

is the primary structural system component and supports all the bearings,

motor cover, mountings, and connectors. It also provides explosion-proof

containment.

The housing is fitted with a stainless steel liner to provide thermal and

dimensional stability for the main bearing. This liner is permanently

installed into the aluminum main housing. A retaining ring is included for

redundant retention.

The main housing also contains rigid mechanical stops to prevent

extension rod travel beyond the design specification. See Figure 2-2.

Brushless DC Motor Assembly

A brushless DC motor powers the HFG2.0 linear drive mechanism. The

DC motor consists of a stator and rotor. See Figure 2-2.

Motor Stator

The motor stator is attached to the main housing by a pre-loaded wave

spring and screws. Thermistors are embedded in the stator windings to

monitor winding temperatures. The motor electrical power and thermistor

wires pass through a conduit into the electronics housing.

Motor Rotor

The motor rotor is locked to the ball screw shaft via a straight key. The

motor rotor contains powerful magnets that align with the energized stator

windings, thereby creating torque and shaft rotation.

Resolver Assembly

A brushless, non-contacting resolver is the primary HFG2.0 feedback

sensor. Resolver excitation is achieved via a sinusoidal signal from the

MCE. The resolver provides two sinusoidal feedback signals back to the

MCE. The resolver assembly includes a stator and rotor. See Figure 2-2.

Resolver Stator

The resolver stator is clamped to the main housing between the main

bearing retaining nut and resolver retainer. The angular position of the

resolver stator relative to the resolver rotor is adjustable. Electrical wires

from the resolver are reeled in the resolver adapter to allow rotation. The

resolver wires, along with the motor and thermistor leads, pass through a

conduit into the electronics housing.

Resolver Rotor

The resolver rotor is mounted to the ball screw shaft by a key. As the rotor

rotates, the stator transformer output signals provide shaft rotation

information to the MCE.

Linear Drive Mechanism

The Linear Drive Mechanism converts the rotary motion of the Motor

Assembly to linear actuator motion. The core of the mechanical drive

system is the linear ball screw drive containing a screw shaft, ball-

bearing-fitted nut, extension rod and main duplex thrust bearings. See

Figure 2-2.

Screw Shaft

The thrust bearings, motor rotor, motor end bearing, and resolver rotor

are mounted directly to the screw shaft. A ball-bearing track is machined

into the screw shaft.

Ball Nut

As the screw shaft rotates, the ball nut translates the rotary motion into

linear motion along the shaft axis. The direction of movement along the

shaft axis is determined by direction of rotation.

CH. 2: UNDERSTANDING THE HFG2.0 31

32 HFG2.0 USER GUIDE

Extension Rod and Bearings

The extension rod is threaded on the ball nut. As the ball nut translates,

the extension rod moves in and out of the HFG2.0 main housing.

Counter-clockwise (CCW) rotation (facing the motor end of the actuator)

of the motor rotor and screw shaft results in the extension rod extending

out of the main housing. Clockwise (CW) rotation results in the extension

rod retracting back into the main housing.

The extension rod support bearing is provided for lateral support. Thrust

and radial loads are transferred from the extension rod through the ball

nut to the main preloaded duplex thrust bearings. The thrust bearings

transfer the loads to the main housing by the main bearing and shaft

retaining nuts.

A motor end bearing is provided for additional radial shaft stability. The

resolver rotor, motor rotor, motor bearing, and spacers are all stacked on

the ball screw shaft and retained by a single nut. This arrangement

prevents actuator axial loads from passing through the resolver rotor and

motor rotor.

The end of the extension rod is connected to the poppet assembly of the

valve. The linear motion of the extension rod, both extension and

retraction, is directly translated to the poppet assembly.

Valve

The valve portion of the HFG2.0 consists of four main components:

• Valve Housing Assembly

• Orifice Assembly

• Soft Seats

• Return Spring

Valve Housing Assembly

The valve housing assembly may be either three pieces or one piece.

The three-piece version consists of upper, center, and lower valve body

sub-assemblies, which are bolted together with eight, ½” diameter, high-

strength, steel bolts. The assembly is made of either machined aluminum

or stainless steel.

The one-piece version consists of a cast aluminum main pressure vessel

and valve cover assembly. The cover assembly attaches to the bottom of

the vessel. This version does not have a drain port.

See Figure 2-3.

Orifice Assembly

The orifice assembly contains a set of poppets and orifice plates. Fuel

flow is metered between the INLET port chamber and OUTLET port

chamber in proportion to the poppet position and resultant flow area.

The poppet assembly is connected to the extension rod of the actuator.

As the actuator retracts, the poppet assembly retracts to increase the flow

area between the poppets and the two orifices. As the actuator extends,

the poppet assembly extends to reduce the fuel exposure from the INLET

port chambers to the two orifices. When the actuator is fully extended, the

poppets seat in the orifices to close the valve. See Figure 2-3.

Soft Seats

The orifices contain pressure-energized soft seats and metal-to-metal

hard seats, which provide a leak-tight seal when the poppets are in a

closed position. See Figure 2-3.

Return Spring

A pre-loaded, fail-safe spring is located between the valve housing and

poppet assembly. The spring load increases as the valve opens. If a

power failure occurs, the spring causes the poppets to return to the soft

seats, thereby closing the valve. See Figure 2-3.

CH. 2: UNDERSTANDING THE HFG2.0 33

34 HFG2.0 USER GUIDE

Figure 2-2. HFG2.0 Cut-Away View – Actuator Main Housing Assembly

Figure 2-3. HFG2.0 Cut-Away View (Partial)

CH. 2: UNDERSTANDING THE HFG2.0 35

36 HFG2.0 USER GUIDE

2.4 Identification Plate

A product identification plate is attached to

the HFG2.0 housing assembly. Figure 2-4

shows a typical identification plate.

The identification plate lists model

designation, product part number, revision

and unit serial number. Hazardous area

operation, certification and electrical wiring

interface information is also provided.

When a unit is refurbished by PECC, a

product refurbishment plate is also

attached to the HFG2.0 housing assembly.

Figure 2-5 shows a typical refurbishment

plate.

The refurbishment plate lists the original

manufacture date, refurbishment date,

refurbishment kit number, and product

revision number.

Figure 2-4. Typical Identification Plate

Figure 2-5. Typical Refurbishment Plate

CH. 2: UNDERSTANDING THE HFG2.0 37

38 HFG2.0 USER GUIDE

INTENTIONALLY BLANK

3 OPERATING THE HFG2.0

This section refers to the position of the actuator when describing

operation of the HFG2.0 valve. The end of the actuator extension rod is

connected to the poppet assembly of the valve. The linear motion of the

actuator, both extension and retraction, is directly translated to the poppet

assembly. The position of the actuator correlates directly to the position of

the valve poppets relative to the orifices. The Home position of the

actuator is the CLOSED position (zero position) of the valve.

3.1 Powering Up

When 120 VDC is applied, the firmware program in the HFG2.0 will clear

all system registers, retrieve all necessary operating parameters from the

electrically erasable programmable read only memory (EEPROM), and

perform an internal status check. This will also happen after a RESET

command has been received. See the flow chart in Figure 3-1 for an

overview of this process.

Note: If the HFG2.0 receives a SET-UP command from the

ActWiz software via the RS232 interface after these steps,

the system will transition to the Set-Up state. This state

allows the user to change the Set-Up parameters and to

download the fault file. See Section 3.8 for details.

CAUTION

Always remove the RUN command during power up. If a RUN

command is given during the Set-Up parameter download phase of

power-up, the valve will not respond until the download is complete

and the Home position has been established.

3.2 Finding Home Position

When the program is complete with a status check, it waits for the RUN

command.

When the status check and other steps in the Power-Up/Reset process

are complete, the HFG2.0 will wait until it receives the RUN command. At

CH. 3: OPERATING THE HFG2.0 39

40 HFG2.0 USER GUIDE

this point, the HFG2.0 has no information about the position of the

actuator extension shaft.

When the HFG2.0 receives the RUN command, it will initiate motion in

the homing direction. The default homing direction for the HFG2.0 is

“Extend”. This means that the first movement after Power Up or Reset will

be an extension of the actuator in the HFG2.0. The actuator will extend at

the rate specified by the Homing Velocity in the Set Up parameters

(default is 0.5 in/sec) until a mechanical stop is encountered. In the

HFG2.0, this stop reached when the poppets seat in the orifices, thus

closing the valve. The HFG2.0 recognizes that a mechanical stop has

been reached when the actuator velocity drops to 0.05 in/sec or less.

The HFG2.0 will then slowly increase the motor current until the current

level corresponding to the Maximum Homing Force has been applied.

This Maximum Homing Force is also specified in the Set Up parameters

and has a default value of 500 lbf. When the pre-determined motor

current limit is reached, the HFG2.0 defines this valve position as Home.

Home is “Valve Closed” for the HFG2.0. The system will then transition to

the Holding Motor Current State. See the flow chart in Figure 3-1 for an

overview of this process.

The DEMAND current determines subsequent positioning of the actuator,

and thus the valve, within its span once the Home position has been

established

See Section 3.8 for additional information about Set-Up parameters.

3.3 Holding Motor Current State

In the Holding Motor Current state, the actuator applies a constant

Holding Force. This feature allows the Home position to thermally expand

or contract without damaging the HFG2.0. This Holding Force is specified

in the Set Up parameters and has a default value of 500 lbf.

The system is in the Holding Motor Current state immediately after

Homing. The system will also move into this state when the DEMAND

signal is > 2mA and < 4.1mA. See the flow chart in Figure 3-1.

Figure 3-1. HFG2.0 Basic Operation Flow Chart

CH. 3: OPERATING THE HFG2.0 41

42 HFG2.0 USER GUIDE

3.4 Moving to Stop Position

The Stop position is a fail-safe position that may be set anywhere

between Home (zero position, Valve Closed) and maximum span

(maximum flow). The default value for Stop position is 0.0 inches, as

defined in the Set-Up parameters.

The actuator will move to the Stop position if the DEMAND signal is ≤ 2

mA (signal loss) at any time after the actuator has completed Homing. It

will also move to the Stop position if the RUN command is removed

during any of the running modes. See the flow chart in Figure 3-1.

3.5 Controlling Motion

Once the Home position has been established, the DEMAND current

determines subsequent positioning of the actuator, and thus the valve,

within its span. The valve will track the DEMAND signal as long as

DEMAND ≥ 4.1 mA and RUN is ON, and will apply up to the maximum

force to reach this DEMAND position. See Figure 3-2. This is defined as

the RUN state, and it is the normal operating mode for the HFG2.0.

The actuator firmware program will remain in this state as long as the

demand is greater than 4.1 mA.

Note: If RUN command is removed or position DEMAND ≤ 2 mA,

the actuator will go to the STOP position.

Home Position

The Home position correlates to a DEMAND signal of 4 mA. The Home

position is determined after Power Up or after the HFG2.0 has been reset.

Dead Band

While the Home position correlates to a DEMAND signal of 4 mA, the

actuator will only move for DEMAND signals ≥ 4.1 mA. The DEMAND

signal range between 4.0 mA and 4.1 mA is therefore considered a Dead

Band. See Figure 3-3.

Once a DEMAND signal ≥ 4.1 mA is detected, the actuator will move to

the position that correlates to that current level. See Interpolation of

DEMAND Signal below.

Hysteresis Band

The actuator should return to the Home position when the DEMAND

Signal drops below the 4.1 mA Dead Band threshold. In practice,

hysteresis may result in the actuator not returning to Home position until

the DEMAND signal drops below a threshold as low as 4.08 mA. The

DEMAND signal range between 4.08 mA and 4.1 mA is therefore

considered the Hysteresis Band. See Figure 3-3.

Full Span Position (Maximum Flow)

The Full Span (Maximum Flow) position correlates to a DEMAND signal

of 20 mA. The maximum Span possible for the HFG2.0 is 1.0 inches due

to the configuration of the valve assembly. The maximum Span possible

for the actuator used in the HFG2.0 is 2.0 inches due to its mechanical

configuration.

The Span value in the Set-Up parameters has a default setting of 1.0

inches of retraction to allow for the distance between the mechanical stop

in the valve and the mechanical stop in the actuator. (The default

definition of Home is Extend, so default Span is a retraction.)

Interpolation of DEMAND Signal

Linear interpolation of the DEMAND signal in the range between 4 mA

and 20 mA is the default condition, as specified in the Set-Up parameters.

With linear interpolation, a DEMAND signal of 12 mA (midway in range of

DEMAND signal) will correlate to a position at 0.5 inches (midway in the

1.0 inch span). See Figure 3-2 for an illustration of linear interpolation.

Note: The actuator and valve position is linear relative to the

DEMAND signal in the default condition. However, due to

the physical profile of the poppets, orifices and soft seats,

the resultant flow area will NOT be linear relative to the

DEMAND signal.

Figure 3-2. HFG2.0 Actuator Position vs. DEMAND, with default conditions

Home as a Mech. Stop in HFG2.0

CH. 3: OPERATING THE HFG2.0 43

44 HFG2.0 USER GUIDE

A non-linear interpolation table can be created to define positioning at 16

discrete current levels in the DEMAND signal range, but only during Set

Up using the ActWiz Software. See the Section 3.8 for additional details

about Set Up parameters.

Figure 3-3. Dead Band of Actuator, Position vs. DEMAND Curve

3.6 Resetting the Actuator

To reset the HFG2.0, +24 VDC must be applied across the RESET wires

for at least 0.5 seconds. The leading edge of the RESET command

causes the HFG2.0 to stop all other operations, but the actual resetting of

the HFG2.0 does not begin until RESET is returned to its OFF state. The

RESET command causes the HFG2.0 to reset all internal position

indicators, reload all Set-Up parameters, and check the health of the

electronics. See the flow chart in Figure 3-1 for an illustration of this. The

HFG2.0 is now in the Power Up / Reset state.

Once the RUN command is detected as ON, the actuator will then move

through its initial homing sequence again. RUN and DEMAND inputs are

ignored during the RESET command.

If FAULT alarm is detected, toggling the RESET command will clear the

FAULT alarm, but it will NOT clear the fault file.

3.7 Monitoring System Health

The firmware program continuously monitors system health while the

HFG2.0 is powered. If any of the health parameters are out of the normal

operating range, the MCE outputs a discrete fault alarm to the user’s

controller.

Some fault causes are:

• MCE over-current

• Tracking error

• RDC failure

• Input voltage out of range

Fault Alarms

The HFG2.0 features two discrete, non-latching outputs that are

configured as fault alarms. Upon power-up, the fault circuits close and

stay closed in the normal operating condition. When the HFG2.0 detects

a system fault, it opens the fault circuit designated for that particular fault.

If a fault alarm is detected, the user should shut down the HFG2.0 to

investigate the failure cause. Removing 120 VDC power shuts down the

HFG2.0 valve.

Toggling the RESET command will clear the alarms.

FAULT Alarm

The configuration of faults assigned to the FAULT alarm is programmable

in the most recent generation of the HFG2.0 (factory-configurable

only). See Table 3-1 for the default configuration of faults assigned to

the FAULT alarm.

See Table 3-3 for a list of fault conditions represented by the FAULT

alarm in earlier generations of the HFG2.0.

OVERTEMP Alarm

The configuration of faults assigned to the OVERTEMP alarm is

programmable in the most recent generation of the HFG2.0 (factory-

configurable only). In the default configuration, the Motor Over Temp fault

is the only fault assigned to the OVERTEMP alarm. If the HFG2.0 detects

that the temperature in two or more of the motor windings is 135° C or

higher, the OVERTEMP alarm circuit opens. See Table 3-2 for details

about the default configuration of the OVERTEMP alarm.

CH. 3: OPERATING THE HFG2.0 45

46 HFG2.0 USER GUIDE

See Table 3-4 for a list of Over Temp conditions represented by the

OVERTEMP alarm in earlier generations of the HFG.

Fault File

The HFG2.0 firmware also captures the fault data in the EEPROM. If the

HFG2.0 is operational, a fault file can be downloaded using ActWiz

software via the RS232 interface. The fault file will provide fault

information and possible causes. The HFG2.0 must be in the Power Up /

Set Up state to download the fault file. See Section 3.8 for details about

the Power Up / Set Up state. Contact Precision Engine Controls

Corporation to request ActWiz software.

Toggling the RESET command will clear the fault alarm, but it does NOT

clear the fault file.

See Section 5: Troubleshooting for a more detailed list of fault causes.

Note: The fault file only records the programmable faults that have

been enabled .

Fault Type Low

Alarm

High

Alarm

Fault

Enable

Persist

Time

Auto

Reset

Output

Driver Overcurrent N/A 1000 lbf Yes 10 Sec Yes Yes

Tracking Error N/A 3.33 % Yes 10 Sec Yes Yes

Position Demand 3.5 mA 20.5 mA No 1 Sec No No

RDC Failure N/A N/A Yes N/A No Yes

+14 Volts 12.0 Volts 16.0 Volts Yes 7.5 Sec Yes Yes

–14 Volts –16.0 Volts –12.0 Volts Yes 7.5 Sec Yes Yes

Input Voltage 75.0 Volts 180.0 Volts Yes 7.5 Sec Yes Yes

EEPROM Checksum N/A N/A Yes N/A No Yes

Motor High Temp N/A 130° C No 10 Sec No No

Electronics High Temp N/A 110° C Yes 10 Sec Yes Yes

+5 Volts 4.5 Volts 5.5 Volts Yes 7.5 Sec Yes Yes

Watchdog Expired N/A N/A Yes N/A No Yes

EEPROM Write N/A N/A Yes N/A No Yes

Table 3-1. Default Configuration For FAULT Alarm

Fault Type Low

Alarm

High

Alarm

Fault

Enable

Persist

Time

Shut-

Down

Output

Driver Overcurrent N/A 1000 lbf No 10 Sec No No

Tracking Error N/A 3.33 % No 10 Sec No No

Position Demand 2 mA 22 mA No 1 Sec No No

RDC Failure N/A N/A No N/A No No

+14 Volts 12.0 Volts 16.0 Volts No 7.5 Sec No No

–14 Volts –16.0 Volts –12.0 Volts No 7.5 Sec No No

Input Voltage 75.0 Volts 180.0 Volts No 7.5 Sec No No

EEPROM Checksum N/A N/A No 7.5 Sec No No

Motor High Temp N/A 135° C Yes 10 Sec Yes Yes

Electronics High Temp N/A 110° C No 10 Sec No No

+5 Volts 4.0 Volts 6.0 Volts No 7.5 Sec No No

Watchdog Expired N/A N/A No N/A No No

EEPROM Write N/A N/A No N/A No No

Table 3-2. Default Configuration For OVERTEMP Alarm

CH. 3: OPERATING THE HFG2.0 47

48 HFG2.0 USER GUIDE

Fault Alarm Type Persist Time Fault Action

Driver Over Current

10 Sec

1 Sec

Driver current > Max Force equivalent

current, Fault.

Driver current > Max Force equivalent

current, Fault. If persists for 1 Min.,

Shutdown

Driver current > 18 Amps, Fault. If

persists for 1 Min., Shutdown

Tracking Error

10 Sec

If in RUN state, not in home dead band

and position error > allowable,

Fault.

If not in overcurrent, RDC not faulted and

feedback not equal to demand, Fault.

Watchdog Expired

< 1 Sec

If last reset was caused by watchdog

timer timeout or illegal address attempt,

Fault.

RDC Failure < 1 Sec Tests hardware for RDC failure, sets

Fault if RDC failure bit set.

Retract/Extended

Command

N/A Fault not used.

Unregulated Voltage Low 10 Sec Unregulated voltage low, Fault.

+14 Volts Low 7.5 Sec

< 1 Sec

+14 V supply < 12 V, Fault.

+14 Volts High 7.5 Sec

< 1 Sec

+14 V supply > 16 V, Fault.

-14 Volts Low 7.5 Sec

< 1 Sec

-14 V supply > -12 V, Fault.

-14 Volts High 7.5 Sec

< 1 Sec

-14 V supply < -16 V, Fault.

Input Voltage Low 7.5 Sec

< 1 Sec

Input Voltage < 75 V, Fault.

Input Voltage High 7.5 Sec

< 1 Sec

Input Voltage > 180 V, Fault.

DSP Failure N/A Fault not implemented.

Electronics Over Temp 10 Sec Electronics temp ≥ 110 °C, Fault

Table 3-3. Fault Configuration For FAULT Alarm

Fault Type Persist Time Fault Action

Motor 10 Sec

1 Sec

Motor temp > 130° C, Fault. . If fault exists and

Motor temp > 135° C for 10 Sec, shutdown.

Motor temp > 130° C, Fault . If fault exists and Motor

temp > 130° C for 60 Sec, shutdown.

Electronics 10 Sec

1 Sec

Electronics temp > 110° C, Fault.

If fault exists and Electronics temp > 115° C for 10 Sec,

shutdown.

Electronics temp > 110° C, Fault.

If fault exists and Electronics temp > 100° C for 15 Sec,

shutdown.

Table 3-4. Fault Configuration For OVERTEMP Alarm

Automatic Shutdown Feature

The HFG2.0 has a self-protective shutdown feature. The HFG2.0 will

shutdown if:

• Any two motor winding temperatures exceed 135 °C for ten (10)

seconds or more (130 °C for 60 seconds )

• The electronics temperature exceeds 115 °C for 10 seconds or

more (100 °C for 15 seconds )

Note: The POSITION and MOTOR CURRENT feedback signals

will both be set to 0 mA when the current to the actuator

motor is removed.

WARNING

Property Damage and Injury Hazard – If the motor windings exceed

135° C (130°C ) or the electronics exceed 115° C

(100° C ), the MCE will shut down power to the motor and

electronics thereby allowing the actuator to move with load. When

power is removed, the return spring causes the poppets to return to

the soft seats, thereby closing the valve. Touching the HFG2.0 may

result in serious burn injury

CH. 3: OPERATING THE HFG2.0 49

50 HFG2.0 USER GUIDE

3.8 Changing Set-Up Parameters

The HFG2.0 uses a number of variables to define its functionality. These

variables are called Set-Up parameters and they are stored in the

EEPROM in the HFG2.0. Default values for these variables are loaded

into the EEPROM at the PECC factory. The Set-Up parameters are

reloaded into the system registers each time the HFG2.0 is powered up

or reset. See Table 3-5 for typical Set-Up parameters.

Users can change the Set-Up parameters to better suit their specific

applications. These parameters are uploaded to the HFG2.0 via the

RS232 interface using PECC’s ActWiz software. The Set-Up parameters

can only be accessed when the HFG2.0 is in the Power Up / Set Up

state. See the Basic Operation Flow Chart in Figure 3-1 and the Power

Up / Set Up State section below for details.

Contact PECC for a copy of ActWiz software. See the ActWiz Software

Manual for further details.

Power Up / Set-Up State

The HFG2.0 is in Power Up / Set Up state immediately after the HFG2.0

has been powered up or reset. This is after the system registers have

been cleared and the Set Up parameters have been reloaded, but before

the Homing process has begun (RUN command = OFF). This is the only

state in which the user can communicate with HFG2.0 via the RS232

interface. In this state, a set-up file can be downloaded to view the current

Set-Up parameters or uploaded to establish new Set-Up parameters. A

Fault file can also be downloaded, also using the ActWiz software. Please

see the ActWiz software manual for more information.

CAUTION

The HFG2.0 will not hold position when communicating with ActWiz

software. The return spring causes the poppets to return to the soft

seats, thereby closing the valve.

A fault file also can be downloaded when the HFG2.0 is in the Power Up /

Set Up state by using ActWiz software via the RS232 interface. The fault

file will provide fault information and possible causes

PARAMETER DESCRIPTION FACTORY

SETTING

Part Number Describes part number of actuator model Per Drawing

Actuator Type Describes type of actuator Stand Alone

Command Source Sets type of command signal Analog

Home Controls the direction the actuator will

move, extending or retracting, to find the

mechanical stop (HOME)

Extend

Span Sets the maximum stroke length,

measured from the HOME position

1.0 inches

Stop Position Sets the signal loss position, measured

from the HOME position

0.0 inches

Interpolation Table Sets how Demand signal is interpolated

between defined points

Linear

Position Loop Constant 63

Current Loop PID Constants

Proportional 2.0

Integral 200

Derivative 0

Velocity Loop PID Constants

Proportional 30

Integral 3,000

Derivative 0

Maximum Velocity Sets the maximum velocity 10 in/s

Maximum Force Sets the maximum force output 1267 lbf

Maximum Homing Velocity Sets the maximum velocity used to find

the HOME position

0.5 in/s

Maximum Homing Force Sets the maximum force the HFG2.0 will

use to find the HOME position

500 lbf

Maximum Holding Force Sets the maximum force to be used to

hold at the HOME position while the

position demand is < 4.1mA and > 2mA

500 lbf

Table 3-5. Typical HFG2.0 Setup Parameters With Default Values

CH. 3: OPERATING THE HFG2.0 51

52 HFG2.0 USER GUIDE

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4 MAINTAINING THE HFG2.0

Under normal operation, the HFG2.0 requires no formal maintenance

program.

Regularly scheduled inspections should be performed to check for:

• any damage to wire insulation on integral 17-wire signal harness

• any damage to wire insulation on integral 4-wire power harness

• actuator-to-valve alignment (or actuator-to-load alignment)

• any damage to housing or mounting hardware

• any damage to power and signal harnesses

• parts that are worn, loose, or shifted due to shock, vibration, etc.

4.1 Refurbishment

PECC recommends that the HFG2.0 be shipped back to the factory for

refurbishment when the user’s system is shut down for overhaul (typically

after approximately 30,000 hours of operation.) Contact PECC for details

about refurbishment.

CH. 4: MAINTAINING THE HFG2.0 53

54 HFG2.0 USER GUIDE

INTENTIONALLY BLANK

5 TROUBLESHOOTING

This section provides troubleshooting information for the HFG2.0. You

can isolate most electrical faults by using an external oscilloscope and

digital voltmeter (DVM) and computer with diagnostic software.

The HFG2.0 is comprised of highly reliable components and should not

develop service problems under normal operating conditions. However,

over a period of time and service, failures may develop. Whoever is

responsible for fault analysis should be thoroughly acquainted with

physical and electrical configurations, Theory of Operation (Section 2),

and Installation (Section 1).

Resolve problems noted during operation or maintenance as soon as

possible. The causes of many problems can be traced through the

information contained in the block diagram shown in Section 2.

CAUTION

Continuing to operate the valve in a malfunctioning condition is

hazardous to personnel and can cause property damage.

Tables 5-1 and 5-2 list common failures that can occur before or after

valve installation, respectively.

In addition, the HFG2.0 has on-board troubleshooting capability. The

ActWiz software has a fault file that you can upload to pinpoint a failure

cause. See the ActWiz Software Manual for more details.

If, after following the troubleshooting procedures, you still can’t find the

cause of the problem and repair it, contact the factory for assistance.

CH. 4: TROUBLESHOOTING THE HFG2.0 55

56 HFG2.0 USER GUIDE

Symptom Probable Causes Corrective Action

Valve Inoperative -

FAULT alarm

Power Wires not connected

No or low 120 VDC power

Ensure RED and GREEN wires correctly connected to

valve

Ensure 120 VDC Primary System Power at valve

Valve Inoperative -

NO FAULT alarm

No RUN or position command Ensure VIOLET and WHITE/VIOLET wires correctly

connected to valve

Ensure 24 VDC RUN and position command at valve

Actuator moves toward

HOME then stops

Intermittent RUN command

Homing Force Too Low

No position demand

Ensure consistent 24 VDC RUN command and fuel

demand signal

Ensure position command at valve

Actuator moves toward

HOME intermittently

Intermittent RESET command Ensure GRAY and WHITE/GRAY wires correctly

connected to Actuator

Ensure consistent 24 VDC RESET command

Actuator finds HOME then

moves to STOP position

No fuel demand signal Ensure BROWN and WHITE/BROWN wires correctly

connected to Actuator

Ensure fuel demand > 2.0 mA at Actuator

Valve does not track fuel

demand

No fuel demand signal or RUN

command

Ensure BROWN and WHITE/BROWN wires correctly

connected to valve

Ensure valve demand > 4.1 mA at valve

Ensure RUN command present at valve

Valve does not hold

consistent position-oscillates

or dithers

Varying fuel demand signal

No or low 120 VDC power

Ensure stable fuel demand at the actuator

Ensure 120 VDC at valve

No valve feedback Valve feedback wires not

connected

No or low 120 VDC power

Self-protective valve auto shut

down

No RUN command

Ensure YELLOW and WHITE/YELLOW wires correctly

connected

Ensure 120 VDC at valve

Upload Fault File- check for motor windings over -

temperature faults.

Check for valve contamination

Ensure RUN command present at valve

No motor current feedback Motor current wires not

connected

No or low 120 VDC power

No RUN command

Ensure BLUE and WHITE/BLUE wires correctly

connected

Ensure 120 VDC at valve

Ensure RUN command present at valve

Valve Operative- FAULT

alarm active

FAULT wiring incorrect

Internal FAULT

Ensure ORANGE and WHITE/ORANGE wires

correctly connected to Actuator

Upload Fault File to identify source of fault

Valve Operative- OVER

TEMP alarm active

OVERTEMP wiring incorrect

Electronics or motor winding

temperature out of range

Valve jammed

Ensure BLACK and WHITE/BLACK wires correctly

connected to valve

Reduce External ambient temperature

Check for valve contamination

Valve leaks when closed Poppet assembly fouled

Valve installed backwards

Stroke valve OPEN and clear foul at orifice

Ensure supply is connected to valve IN port

Symptom Probable Causes Corrective Action

RS232 Interface Inoperative Incorrect wiring

No or low 120 VDC power

COM1 not connected

RESET or RUN command is

ON

Ensure WHITE/ORANGE/YELLOW,

WHITE/ORANGE/BLUE, WHITE/ORANGE/GREEN

wires correctly connected to valve and laptop PC.

Ensure 120 VDC Primary System Power at Valve

Check laptop/PC com port

Remove RESET or RUN command

Table 5-1. Initial Installation Troubleshooting Chart

Symptom Probable Causes Corrective Action

No valve feedback No or low 120 VDC power

Self-protective valve auto shut

down

Ensure 120 VDC at valve

Upload Fault File- check for motor windings over -

temperature faults.

Check for valve contamination

FAULT alarm Various Upload Fault File to identify source of fault

Clear indicated fault

OVER TEMP alarm Ambient temperature limit

exceeded

Electronics or motor winding

temperature out of range

Allow actuator to cool and re-start

Reduce ambient temperature

Check for valve contamination

FAULT and OVERTEMP

alarm

No 120 VDC Power

DSP Failure

Ensure 120 VDC at actuator

Contact factory

Table 5-2. HFG2.0 In-Service Troubleshooting Chart

For troubleshooting purposes, use Table 5-3 to verify the valve electrical

continuity integrity.

Disconnect the HFG2.0 power and digital harness connectors and use a

digital multi-meter (DMM) to check the resistance values between the

wires indicated on the table. If an open circuit is detected, send the

HFG2.0 to Precision Engine Controls Corporation for test and repair.

WARNING – Shock Hazard

Remove all power to the HFG2.0 prior to continuity check.

CH. 4: TROUBLESHOOTING THE HFG2.0 57

58 HFG2.0 USER GUIDE

Function Actuator Wire Colors Resistance Value

DEMAND BRN and WHT/BRN 225Ω

RUN VIO and WHT/VIO 4.7 KΩ

RESET GRY and WHT/GRY

4.7 KΩ

POWER RED and GREEN High Impedance, but

not open circuit.

MOTOR CURRENT BLU and WHT/BLU High Impedance

POSITION YEL and WHT/YEL High Impedance

FAULT Alarm ORN and WHT/ORN High Impedance

OVERTEMP Alarm BLK and WHT/BLK High Impedance

Table 5-3. HFG2.0 Electrical Continuity Troubleshooting Chart

5.1 FAULT File

The FAULT and OVERTEMP alarms are discrete outputs from the

HFG2.0. The FAULT and OVERTEMP alarm circuits are closed in the

normal operating condition. If the HFG2.0 detects a fault, the alarm circuit

for that fault opens, and the user-provided controller should detect the

open circuit. The fault is recorded in the fault file.

The HFG2.0 firmware captures the fault data in the EEPROM. If the

HFG2.0 is operational, a fault file can be downloaded using ActWiz

software via the RS232 interface. The fault file will provide fault

information and possible causes. The HFG2.0 must be in the Power Up /

Set Up state to download the fault file. See Section 3.8 for details about

the Power Up / Set Up state. Contact Precision Engine Controls

Corporation to request ActWiz software.

Should a fault occur, the user should shut down to troubleshoot the

failure. Removing 120 VDC power shuts down the HFG2.0. Toggling the

RESET command will clear the fault, but it does NOT clear the fault file.

Note: The fault file only records the programmable faults that have

been enabled .

Fault Descriptions

The following are brief description of some of the faults that can be

detected by the HFG2.0. See Section 3.7 and Table 3-1 , Table 3-2

, Table 3-3 , and Table 3-4 for additional details

about system faults.

Driver over-current

The maximum MCE current output limit is 25 amps. If the MCE is

outputting its maximum current for ten (10) seconds, the MCE signals a

fault.

If MCE maximum current drop below the maximum current, the fault

signal is cleared.

Tracking error

The HFG2.0 position should continuously track demand. Should the

position versus demand vary more than one motor revolution (0.20

inches) for more than ten (10) seconds, the MCE signals a fault.

If the position returns to within one motor revolution, the fault signal is

cleared.

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60 HFG2.0 USER GUIDE

Watchdog expired

The MCE watchdog timer continuously monitors the firmware program.

Should the MCE firmware program stop functioning, or attempt to access

an illegal address, the MCE signals a fault.

This fault does not clear without RESET command.

Resolver to Digital Converter (RDC) failure

The MCE contains a resolver to digital converter chip (RDC) that provides

position feedback information to the DSP. The RDC chip has on-board

health monitoring.

If the RDC detect an internal tracking error, a signal is sent to the MCE.

Upon receipt, the MCE signals a fault.

This fault does not clear without RESET command.

Unregulated Voltage Low

The MCE signals a fault if the reference voltage drops below minimum for

ten (10) seconds .

If the voltage returns to acceptable level, the fault signal is cleared.

+/- 14V High/Low

The MCE signals a FAULT if the internal ±14 VDC power supplies

exceed operating limits. This fault does not clear without RESET

command.

Input voltage High/Low

The MCE signals a fault if the 120 VDC supply exceeds 180 VDC or

drops below 75 VDC for more than 7.5 seconds (1 second for

). This fault clears when the 120 VDC supply voltage returns.

APPENDIX A: DECOMMISSIONING & DISPOSAL

This section contains recommended HFG2.0 decommissioning and

disposal practices. It is for permanent removal or replacement of the

installed product, with no intentions of rework, overhaul, or to be used as

spares.

For removal follow proper lockout /tagout procedures and verify no live

electrical circuits:

• Disconnect the 4 wires of the integral power harness to the

HFG2.0.

• Disconnect the 17 wires of the integral signal harness to the

HFG2.0

• Disconnect the ground wire from the HFG2.0 chassis

• Disconnect the fuel inlet pipe

• Disconnect the fuel outlet pipe

Note: Follow local environmental codes in regards to disposal of

electronic components, specifically all electrolytic

capacitors.

APPENDIX A: DECOMMISIONING 61

62 HFG2.0 USER GUIDE

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APPENDIX B: GLOSSARY

Term Definition

RUN Command A discrete 24 VDC signal that enables the HFG2.0 actuator and valve

to move.

RESET Command A discrete 24 VDC signal that causes the HFG2.0 internal program

(firmware) to jump to the beginning.

Controller A user-provided computer that executes commands to the HFG2.0

and accepts analog and discrete feedback.

Fuel Demand A 4 mA to 20 mA signal that commands the HFG2.0 to move to a

certain actuator/valve position. The signal is scaled with SPAN.

Position Demand Feedback A 4 mA to 20 mA signal that communicates the actual HFG2.0

actuator/valve position to the controller.

Motor Current Feedback A 4 mA to 20 mA signal that is proportional to the HFG2.0 motor

current. The signal is scaled with Max. Force.

FAULT alarm A discrete signal from the HFG2.0 that communicates an internal

failure. The user’s controller will see an open circuit when a FAULT

alarm is active.

OVERTEMP alarm A discrete signal from the HFG2.0 that communicates an internal

over temperature; electronics or motor. The user’s controller will see

an open circuit when the OVERTEMP alarm is active.

HOME A mechanical rigid stop from which the HFG2.0 calculates position.

HOME is found at start-up during the Homing sequence. The HFG2.0

defines HOME when the motor current exceeds the HOMING

FORCE and velocity is zero. HOME is defined as the actuator/valve

position when the Demand signal is 4 mA. HOME is the Valve Closed

condition for the HFG2.0

Homing sequence When the HFG2.0 extends or retracts to find a rigid mechanical stop.

SPAN Maximum distance from HOME. SPAN is defined as the position

when the Demand signal is 20 mA.

STOP position A user-defined position between HOME and SPAN that the HFG2.0

travels to upon loss of RUN or position Demand signal.

Maximum Velocity A user defined maximum velocity in inches per second.

Maximum Homing Force A user defined maximum homing force output setting. The motor

control electronics uses this setting to determine the maximum motor

current in the Homing sequence.

Maximum Holding Force A user-defined maximum force while in the Holding Motor Current

state.

APPENDIX C: GLOSSARY 63

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64 HFG2.0 USER GUIDE