Home ›

File info: application/pdf · 32 pages · 2.28MB

The MGS-408

MGS-402 Gas Detection Controller - Instrumart

manual. Ensure that all product documentation is retained and available to anyone operating the instrument. 1. Introduction 1.1 About this Manual Thank you for investing in a Bacharach MGS-402 Gas Detector Controller. T…

MGS-402 Gas Detection Controller - Bacharach, Inc.

Fixed Gas Detection. P/N: 1100-2570 | March 2020 Revision 1. MGS-402 Gas Detection Controller for Commercial & Industrial Applications. User. Manual ...

P/N: 1100-2570 | March 2020 Revision 1 MGS-402 Gas Detection Controller for Commercial & Industrial Applications User Manual. 1100-2570 Rev 1 a MGS-402 User Manual

Full PDF Document

If the inline viewer fails, it will open the original document in compatibility mode automatically. You can also open the file directly.

Extracted Text

MGS-402 Gas Detection Controller
for Commercial & Industrial Applications

Fixed Gas Detection
P/N: 1100-2570 | March 2020 Revision 1

User Manual

MGS-402 User Manual
WARRANTY POLICY
Bacharach, Inc. warrants to buyer that at the time of delivery this product will be free from defects in material and manufacture and will conform substantially to Bacharach, Inc.'s applicable specifications. Bacharach's liability and buyer's remedy under this warranty are limited to the repair or replacement, at Bacharach's option, of this product or parts thereof returned to seller at the factory of manufacture and shown to Bacharach, Inc.'s reasonable satisfaction to have been defective; provided that written notice of the defect shall have been given by buyer to Bacharach, Inc. within one (1) year after the date of delivery of this product by Bacharach, Inc.
Bacharach, Inc. warrants to buyer that it will convey good title to this product. Bacharach's liability and buyer's remedy under this warranty of title are limited to the removal of any title defects or, at the election of Bacharach, to the replacement of this product or parts thereof that are defective in title.
THE FOREGOING WARRANTIES ARE EXCLUSIVE AND ARE GIVEN AND ACCEPTED IN LIEU OF (I) ANY AND ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE: AND (II) ANY OBLIGATION, LIABILITY, RIGHT, CLAIM OR REMEDY IN CONTRACT OR TORT, WHETHER OR NOT ARISING FROM BACHARACH'S NEGLIGENCE, ACTUAL OR IMPLIED. The remedies of the buyer shall be limited to those provided herein to the exclusion of any and all other remedies including, without limitation incidental or consequential damages. No agreement varying or extending the foregoing warranties, remedies or this limitation will be binding upon Bacharach, Inc. unless in writing, signed by a duly authorized officer of Bacharach.
Register Your Warranty by Visiting: www.mybacharach.com
SERVICE POLICY
Bacharach, Inc. maintains a service facility at the factory. Some Bacharach distributors / agents may also have repair facilities; however, Bacharach assumes no liability for service performed by anyone other than Bacharach personnel. Repairs are warranted for 90-days after date of shipment (sensors, pumps, filters and batteries have individual warranties). Should your instrument require non-warranty repair, you may contact the distributor from whom it was purchased or you may contact Bacharach directly.
If Bacharach is to do the repair work, send the instrument, prepaid, to the closest service center. Prior to shipping equipment to Bacharach, visit www.mybacharach.com for a Returned Merchandise Authorization Number ( #). All returned goods must be accompanied by a RMA #. Pack the equipment securely (in its original packing, if possible), as Bacharach cannot be held responsible for any damage incurred during shipping to our facility. Always include your RMA #, shipping address, telephone number, contact name, billing information and a description of the defect as you perceive it. You will be contacted with a cost estimate for expected repairs prior to the performance of any service work. For liability reasons, Bacharach has a policy of performing all needed repairs to restore the monitor to full operating condition.
NOTICES
Product improvements and enhancements are on-going, therefore the specifications and information contained in this document may change without notice.
Bacharach, Inc. shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.
No part of this document may be photocopied, reproduced, or translated to another language without the prior written consent of Bacharach, Inc.
Copyright � 2020, Bacharach, Inc., All Rights Reserved. BACHARACH is a registered trademark of Bacharach, Inc. All other trademarks, trade names, service marks and logos referenced herein belong to
their respective companies.
a 1100-2570 Rev 1

MGS-402 User Manual
Contents
Introduction...................................................... 1
1.1 About this Manual............................................................................................................ 1 1.2 Conventions....................................................................................................................... 1
1.2.1 Iconography...................................................................................................................................................1
1.3 General Safety Statements.............................................................................................. 2
Product Description.......................................... 3
2.1 Product Overview............................................................................................................. 3 2.2 Intended Use..................................................................................................................... 4 2.3 Design Features................................................................................................................ 4 2.4 Front Panel........................................................................................................................ 5 2.5 Components...................................................................................................................... 6 2.6 Communication Features................................................................................................ 6
Installation........................................................ 7
3.1 Warnings & Cautions........................................................................................................ 7 3.2 Preliminary Inspection..................................................................................................... 7 3.3 Suitable / Appropriate Locations.................................................................................... 7 3.4 Mounting the Gas Detection Controller......................................................................... 8 3.5 Power Wiring..................................................................................................................... 8
3.5.1 Connecting the Main (100-240 VAC) Power................................................................................................8
3.6 Sensor Output & Modbus Connections.......................................................................... 9
3.6.1 MGS-402 Gas Detection Controller Network..............................................................................................9 3.6.2 Integration with Building Management System......................................................................................11
3.7 Connecting External Alarms.......................................................................................... 11
3.7.1 Overview.......................................................................................................................................................11
3.8 Reinstalling MGS-402 Lid................................................................................................ 12
b 1100-2570 Rev 1

MGS-402 User Manual
Operation......................................................... 14
4.1 Overview.......................................................................................................................... 14
4.1.1 Main Function..............................................................................................................................................14 4.1.2 Power Up......................................................................................................................................................14 4.1.3 Channel number keys.................................................................................................................................14
4.2 Controller Setup.............................................................................................................. 14
4.2.1 Modbus Setup..............................................................................................................................................14 4.2.2 Relay Setup..................................................................................................................................................16
4.3 Gas Detection System Test............................................................................................ 17
Modbus............................................................. 19
5.1 Modbus Overview........................................................................................................... 19
5.1.1 SLAVE NODE ADDRESS................................................................................................................................19 5.1.2 SLAVE BAUD RATE........................................................................................................................................19 5.1.3 SLAVE PARITY ..............................................................................................................................................19 5.1.4 SLAVE STOP BIT............................................................................................................................................19 5.1.5 SLAVE TERMINATION ..................................................................................................................................19
5.2 Modbus Registers........................................................................................................... 19
Diagnostics & Troubleshooting..................... 24
6.1 FAULT CODES................................................................................................................... 24
Additional Information.................................. 25
7.1 Disposing of Instrument................................................................................................ 25 7.2 Technical Specifications................................................................................................. 25
Parts and Accessories..................................... 26
8.1 Part Numbers.................................................................................................................. 26 8.2 Service Center Locations................................................................................................ 26
c 1100-2570 Rev 1

MGS-402 User Manual
1. Introduction

1.1 About this Manual
Thank you for investing in a Bacharach MGS-402 Gas Detector Controller. To ensure operator safety and the proper use of the controller, please read the contents of this manual for important information on the operation and maintenance of the instrument.
IMPORTANT: Before using this product, carefully read and strictly follow the instructions in the manual. Ensure that all product documentation is retained and available to anyone operating the instrument.

1.2 Conventions

1.2.1 Iconography

Alert

Icon

Description

DANGER WARNING WARNING CAUTION

Imminently hazardous situation which, if not avoided, will result in death or serious injury.
Potentially hazardous situation which, if not avoided, could result in death or serious injury.
Potential electrical shock hazard which, if not avoided, could result in death or serious injury.
Potentially hazardous situation which, if not avoided, could result in physical injury or damage to the product or environment. It may also be used to alert against unsafe practices.

IMPORTANT

Additional information on how to use the product.

1 1100-2570 Rev 1

MGS-402 User Manual
1.3 General Safety Statements
DANGER: This instrument is neither certified nor approved for operation in oxygen-enriched atmospheres and / or hazardous locations. Failure to comply may result in personal injury or death. WARNING: Always remove AC power before working inside the MGS-402 enclosure and exercise extreme care when accessing the products interior. Only qualified electrical maintenance personnel should perform connections and adjustments. CAUTION: The protection provided by this product may become impaired if it is used in a manner not specified by the manufacturer. Modifications to this instrument, not expressly approved, will void the warranty. CAUTION: In case of malfunction, DO NOT continue to use this equipment if there are any symptoms of malfunction or failure. In the case of such occurrence, de-energize the power supply and contact a qualified repair technician or the nearest Bacharach Service Center. CAUTION: Use ONLY the provided cable glands for electrical and communication wiring. Drilling into the box will void the warranty.
2 1100-2570 Rev 1

MGS-402 User Manual
2. Product Description

2.1 Product Overview

The MGS-402 Gas Detection Controller displays centralized information about the status of connected MGS410 gas detectors. The MGS-402 is connected to the MGS-410s via Modbus RTU.

The MGS-402 can be used to provide power to each connected MGS-410 gas detector, negating the need for separate power supply at the location of the gas detector.

The MGS-402 displays status via a bank of LEDs that represent the channel/sensor connected to it. Each channel/sensor has a row of dedicated LEDs to indicate the status of the sensor:

Power

Fault

Low alarm

High alarm

The MGS-402 provides three relays (fault, low and high alarm status) for connection to auxiliary systems, ventilation or other equipment.

The MGS-402 has an integrated visual alarm of LEDs around the perimeter of the controller that will activate when a low or high alarm is received from either channel. In addition, the integrated audible alarm will activate in the same manner.

In addition to being a Modbus master to the MGS-410 gas sensors, the MGS-402 acts as a Modbus slave for ease of integration into a building automation system (BMS) or programmable logic controller (PLC). The controller also features two analog outputs which may enable monitoring gas detector levels remotely.

Figure 2-1 - The MGS-402 Gas Controller System

3 1100-2570 Rev 1

MGS-402 User Manual

WARNING: This instrument is neither certified nor approved for operation in oxygen-enriched atmospheres. Failure to comply may result in EXPLOSION.
WARNING: For your safety, DO NOT use this instrument in locations classified as hazardous because it has not been designed for such areas.

2.2 Intended Use
The MGS-402 provides audio-visual alerts and information pertaining to the status of a centralized gas detector network. This information allows concise, at-a-glance notification of any alarm or fault status regarding a connected gas detector located outside the monitored space, as required by industry safety standards (EN 378, ASHRAE 15).

2.3 Design Features

Power options

100 - 240 VAC, 50/60 Hz, 20 W (max.) Provides power for up to (2) MGS-410 Bacharach gas detectors

Output/ Communications

RS485 Modbus RTU Master for Gas Detectors
RS485 Modbus RTU Slave for BMS
Diagnostic/status LEDs � Controller (power, fault) � Gas detectors (power, fault, low alarm, high alarm)
Configurable output options � 3 � relays (fault, low alarm, high alarm) � 2� Analog outputs (4-20 mA, 1-5 V or 2-10 V)
Integrated high output visual strobe
Integrated high output audible alarm
Remote silence input (In addition to silence on the on the controller input.)

4 1100-2570 Rev 1

MGS-402 User Manual
2.4 Front Panel
Figure 2-2 - Front Panel Layout

# 1 2 3 4 5 6

Front Panel Description Integrated visual alarm in bezel Controller Power & Fault LEDS Channel 1 and 2 mute alarm buttons Power, Fault, Low Alarm, High Alarm LEDs; each channel M16 Cable Glands (�6) M20 Cable Glands (�2)

5 1100-2570 Rev 1

MGS-402 User Manual
2.5 Components
Figure 2-3 - MGS-402 Layout

Component Description

1 Analog Outputs (�2) 2 Modbus to Gas Detectors 3 Modbus to BMS 4 Remote Silence 5 Audible Alarm 6 Fault Relay 7 High Alarm Relay

Component Description

8 Low Alarm Relay 9 AC Power Line Input 10 Power Supply 11 Sensor Power Connections (�2) 12 M20 Cable Glands (�2)

13 M16 Cable Glands (�6)

2.6 Communication Features
The MGS-402 Gas Detection Controller features full two-way communications via an RS-485 interface. Modbus RTU is the communication protocol standard. The controller is configured as a Modbus master and can be the centralized controller for a two sensor gas network and also has a Modbus slave port for connection to a BMS / fire safety panel for a complete gas detection solution.
6 1100-2570 Rev 1

MGS-402 User Manual
3. Installation
3.1 Warnings & Cautions
WARNING: Explosion hazard! Do not mount the MGS-402 Gas Detection Controller in an area that may contain flammable liquids, vapors or aerosols. Operation of any electrical equipment in such an environment constitutes a safety hazard. WARNING: Electrical installation should be performed by a certified electrician, and should comply with all applicable NEC / CEC and local electrical safety codes. WARNING: Shock hazard! Always turn off AC power before working inside the monitor.
CAUTION: Drilling holes in the MGS-402 Gas Detection Controller enclosure may damage the unit and will void the warranty. Please use provided cable glands for electrical connections. CAUTION: The MGS-402 Gas Detection Controller contains sensitive electronic components that can be easily damaged. Be careful not to touch or disturb any of these components.
3.2 Preliminary Inspection
The MGS-402 Gas Detection Controller has been thoroughly inspected and tested prior to shipment from the factory. Nevertheless, it is recommended that the instrument be re-checked prior to installation. Inspect the outside of the enclosure to make sure there are no obvious signs of shipping damage. Remove the top of the enclosure. Visually inspect the interior of the enclosure for loose wires or components that may have become dislodged during shipment. If damage is discovered, please contact a qualified repair technician or the nearest Bacharach Service Center for assistance.
3.3 Suitable / Appropriate Locations
The MGS-402 Gas Detection Controller is design for use in a small gas detection network that could be in mechanical rooms, warehouses, cold storage or freezers to help comply with international safety standards (EN 378, ASHRAE 15, CSA-B52). The MGS-402 is a NEMA 4X (poly carbonate) or IP66 rated enclosure and can be placed in environments from -40 OC to +50 OC ambient temperatures. Typical installations would be either inside or outside the door of an enclosed space to have local audible and visual alarms as required by safety standards. The MGS-402 is not intended for installation in classified locations.
7 1100-2570 Rev 1

MGS-402 User Manual
3.4 Mounting the Gas Detection Controller
NOTE: A certified AC power disconnect or circuit breaker should be mounted near the controller and installed following applicable local and national codes. If a switch is used instead of a circuit breaker, a properly rated CERTIFIED fuse or current limiter is required to be installed as per local or national codes. Markings for positions of the switch or breaker should state (I) for on and (O) for off. WARNING: DO NOT allow the lid / sensor to hang from the ribbon cable. Failure to comply may result in damage to the product.
1. Mount the MGS-402 according to the product dimensions, maximum wiring lengths and following considerations: � Environment: the full range of environmental conditions when selecting a location. � Application: the specifics of the application (possible leaks, air movement / draft, etc.) when selecting a location. � Accessibility: the degree of accessibility required for maintenance purposes when selecting a location.
2. Using a 5/32 (4 mm) hex key / allen wrench (not included) remove the lid and disconnect the ribbon cable from the base.
3. Set the lid and rubber gasket aside to be reinstalled later.
3.5 Power Wiring
3.5.1 Connecting the Main (100-240 VAC) Power
The MGS-402 controller features (2) M20 cable glands (item 12 in "Figure 2-3 - MGS-402 Layout" on page 7) that are intended for power entry / wiring.
WARNING: Copper conductors for connection to main power supply and output relays must be made in accordance with local building codes. Locate the AC power input terminal block (item 9 in "Figure 2-3 - MGS-402 Layout" on page 7) and remove it from the controller. 4. Ensuring that the main power is turned off at the upstream circuit breaker or disconnect
switch, feed the incoming power leads through one of the M20 glands and into the appropriate terminals (L (Live) � black/brown, E (Earth) � green, N (Neutral) � white / blue) on the terminal block.
8 1100-2570 Rev 1

MGS-402 User Manual
5. Plug the power terminal block back into the printed circuit board (PCB). Figure 3-1 - Power Terminal Block
L EN
3.6 Sensor Output & Modbus Connections
3.6.1 MGS-402 Gas Detection Controller Network
The MGS-402 Modbus communications network is connected to the MGS-410 gas detectors using a shielded twisted pair instrument cable (Belden 3106A or equivalent). The same type of cable can be used for power connection when using the MGS-402 controller as the power source (+24VDC) for the MGS-410 gas sensors and standard Modbus network limits. Care needs to be taken to account for voltage drops between the controller and the MGS-410 gas sensors and standard Modbus network limits. The furthest distance the MGS-410 can be from the MGS-402 controller is 1000ft (305m) when using 20 - 16AWG conductors for the sensor power and Modbus connections.
3.6.1.1 Connecting the +24 VDC Terminal Block:
When using the MGS-402 as the +24VDC power source of the MGS-410 gas sensors the power should be connected the following manner.
1. Locate the +24 VDC terminal block in the MGS-402 controller (item 11 in "Figure 2-3 - MGS-402 Layout" on page 7).
2. Using Belden 3106A or equivalent control wire feed through one of the available cable glands and connect the `+' and `-` terminals to the appropriate terminals in the MGS-402. NOTE: Refer to the MGS-410 User Manual or QSG for location and connection of the corresponding +24 VDC terminal block in the MGS-410 gas sensor.
9 1100-2570 Rev 1

MGS-402 User Manual
3. Reconnect +24VDC terminal to the PCB and repeat for a second MGS-410 gas sensor if needed. Figure 3-2 - +24 VDC Terminal Block
-+ 3.6.1.2 Connecting the Modbus network from the MGS-402 to the MGS-410
1. Locate the Modbus/Sensor terminal block in the MGS-402 controller (item 2 in "Figure 2-3 - MGS402 Layout" on page 7).
2. Using one of the M16 cable glands feed the Belden 3106A or equivalent cable through the cable gland and connect to the Modbus/Sensor terminal in the following manner.
3. Connect one lead to of the twisted pair (note wire color) to the `B' terminal. 4. Connect the second lead of the twisted pair to the `A' terminal (note wire color). 5. Connect the ground to the `GND' terminal and then connect the shield or drain lead to the
`SH' terminal. 6. Replace the terminal block into the MGS-402 controller.
Figure 3-3 - MODBUS/Sensor Terminal Block
B A GND SH
10 1100-2570 Rev 1

MGS-402 User Manual
Refer to the MGS-410 User Manual (P/N: 1100-2294) or Quick Start Guide (P/N: 1100-2290) for location and connection of the corresponding Modbus terminal block in the MGS-410 gas sensor.
NOTE: Ensure that the corresponding wire colors noted above are connected to the correct `B' and `A' terminals in the Modbus terminal block in the MGS-410 gas sensor and the ground and drain are properly terminated according to Modbus protocol.
3.6.2 Integration with Building Management System
A second Modbus connection is available in the MGS-402 to connect to a Building Management System (BMS). The physical connections are made the same as described above in section 3.6.1 but using the Modbus/BMS terminal block (item 3 in "Figure 2-3 - MGS-402 Layout" on page 7).
1. Locate the Modbus / BMS terminal block in the MGS-402. 2. Feed Belden 3106A or equivalent cable through one of the M16 cable glands (item 13 in "Figure
2-3 - MGS-402 Layout" on page 7) and connect to the appropriate terminals noting the color of the wire. 3. Make similar connections to the BMS noting wire color. 4. Controller/BMS Modbus configuration will need to be completed in section 4.2, Controller Setup.
3.7 Connecting External Alarms
3.7.1 Overview
In addition to the integrated visual and audible alarms there are several outputs available in the MGS-402 to interface with external ventilation, external equipment or for connection to a BMS or buildings fire safety panel. There are (3) form C relay contacts rated 10A at 240VAC and (2) Analog Outputs (4-20ma, 1-5V, 2-10V). In addition there is (1) Remote Silence input to interface with a momentary push button that may be in a different location than the MGS-402. See items 1 (Analog outputs), 7-9 (Form C Relays) and 4 (Remote Silence) in "Figure 2-3 - MGS-402 Layout" on page 7. The additional outputs should be wired in the same manner as the power and Modbus connections. Use appropriate conductor sizes on the form C relays that adhere to local building codes. The remote silence and analog outputs can be wired using Belden 3106A or equivalent cable.
NOTE: The relay contacts are rated 10A at 250VAC resistive load.
11 1100-2570 Rev 1

MGS-402 User Manual
3.8 Reinstalling MGS-402 Lid
WARNING: DO NOT leave excess cable inside the gas detector housing. Failure to comply may result in damage to the product. CAUTION: When installing the sensor ribbon cable, care must be taken to ensure the proper orientation of the connector at both ends of the cable. Failure to ensure proper orientation may result in loss of functionality and/or product damage. NOTE: To achieve proper seal, the lid screws should be torqued to 15 to 20 lbf in (1.5 to 2.0 Nm.) Reinstall the rubber gasket. Ensure that it is correctly seated by placing the side with two grooves face down and the edge with two bumps on the top. Figure 3-4 - Rubber Gasket
5. Reconnect the ribbon cable from the sensor to the PCBA as shown. Figure 3-5 - Ribbon Cable Orientation
WARNING: DO NOT allow the lid / sensor to hang from the ribbon cable. Failure to comply may result in damage to the product.
12 1100-2570 Rev 1

MGS-402 User Manual
6. Ensure no cables are interfering with the sensor module and close the lid. Using a 5/32 (4 mm) hex key / allen wrench, tighten the lid screws in an "X" tightening pattern:
Figure 3-6 - Tightening Pattern
13 1100-2570 Rev 1

MGS-402 User Manual
4. Operation
4.1 Overview
4.1.1 Main Function
Every second the MGS-402 Gas Detection Controller collects gas concentration and status information from each connected gas detector. Connection status, fault and alarm conditions are indicated by the LED matrix for each channel. Detector data and controller status information can also be communicated via Modbus, to a master or BMS device.
4.1.2 Power Up
During power up the perimeter visual alarm and the audible alarm will both run through a test cycle. The green Power LED for the controller (See item 2, "Figure 2 - Front Panel Layout" on page 7) will illuminate. When the MGS-402 establishes communications with the MGS-410 controllers the Fault LED for the controller (item 2, "Figure 2 - Front Panel Layout" on page 7) will go from amber to not illuminated. It can take up to 5 minutes for the MGS-410 Gas Detectors to warm up.
4.1.3 Channel Number Keys
Pressing a channel number key for five-seconds on the front panel of the MGS-402 will silence an audible alarm for 30-minutes. After which time, MGS-402 will re-alarm or reset depending on whether the alarm condition still remains.
4.2 Controller Setup
4.2.1 Modbus Setup
Configure MGS-402 to BMS. If using the MGS-402 to interface with a BMS as a slave the Modbus protocol needs to be configured. (Refer to "item 3, Figure 2-3 - MGS-402 Layout" on page 6.)
14 1100-2570 Rev 1

MGS-402 User Manual
Figure 4-1 - MGS-402 Back of Lid Label

Using switch 1 (SW1) on the underside of the lid of the controller use setting 4 to acknowledge whether the MGS-402 will need to have the terminating resistor engaged. Please see Modbus protocol for best practice.

Switch 1

MODBUS Setting

OFF ON
OFF ON
OFF ON
OFF ON

Action
Parity Disabled Parity Enabled Even Parity Odd Parity 1 Stop Bit 2 Stop Bits 9600 Bits Per Second 19200 Bits Per Second

MODBUS Address
10 20 30 40 50 60 70 80

Switch 2

Setting

OFF OFF ON

OFF ON OFF

OFF ON ON

ON OFF OFF

ON OFF ON

ON ON OFF

ON ON ON

OFF OFF OFF

NOTE: All of the above settings must match the BMS system to work correctly.

15 1100-2570 Rev 1

MGS-402 User Manual
4.2.2 Relay Setup
Additional hardware configuration.
4.2.2.1 Form C Relays
The (3) form C relays that are included in the MGS-402 (fault, low alarm, high alarm) can be configured to be fail safe (if power is lost on the relay it will be set to its fault or alarm state until power is restored). The fail safe mode can be configured for each of the individual relays and is done using SW1 settings 1, 2 and 3. If fail safe mode is desirable for the form C relays change settings to ON.
4.2.2.2 Multiple MGS Gas Sensors
Switch 2 setting 3 is enabled if a second MGS-410 sensor will be connected to the MGS-402 (one sensor is default).
4.2.2.3 Analog Outputs
The (2) analog outputs can be configured to 4-20mA, 1-5V or 2-10V depending on preference. When configured both analog outputs will be configured the same (i.e., both 4-20mA, both 1-5V or both 2-10V). Using SW2 settings 4 and 5 set the desired configuration.

Condition
Offline, Warmup Fault
Under-range Over-range
Normal

4-20 mA
3 mA 1 mA 3.8 mA 20.5 mA 4-20 mA

1-5V
0.75V 0V
0.95V 5V 1-5V

2-10V
1.5V 0V 1.9V 10V 2-10V

IMPORTANT: The Analog outputs come with a jumper installed from the factory. This ensures that the MGS-402 does not go into alarm mode upon power but before connecting the analog outputs � no signal or very small signal is a communications fault. Remove these jumpers after configuring the analog outputs.

16 1100-2570 Rev 1

MGS-402 User Manual
4.3 Gas Detection System Test
After installation and power-up of the MGS-402 Controller, one should verify that the instrument and connected devices are functioning as intended. The following steps should be considered in the commissioning.
1. Inspect the MGS-402 Controller and verify the following:

Figure 4-2 - Inspecting the MGS-402

Power LED is solid GREEN Fault LED is OFF
Channel Power LEDs are BLINKING

Channel Fault / Alarm LEDs are OFF No Audio Alarm

2. Inspect connected MGS-410 Gas Detector(s) and verify the following: Figure 4-3 - Inspecting Connected MGS-410
No Audio Alarm LED is solid GREEN

3. If applicable, verify that any monitoring device(s) connected to the MGS-402's analog output is receiving the proper signal from the controller.
4. If applicable, verify that any Modbus BMS Master device(s) are communicating properly with the MGS-402 controller.
5. If applicable, verify any peripheral device(s) which are connected to the MGS-402's relays are operating as intended in a normal / non-alarm status.

17 1100-2570 Rev 1

MGS-402 User Manual
CAUTION: The following System Check is intended to reproduce the full function of the gas detection system in its alarm state. The individual conducting the test should be aware these alarm responses; including audio / visual alarms, peripheral devices and / or any equipment shutdown processes prior to starting the test. Any adverse consequences resulting from simulating a system alarm response should be anticipated and mitigated before starting the test. Always follow local procedures / policy when conducting a gas detection system test. 7. As a final system commissioning step, apply calibration span gas to the connected MGS410 Refrigerant Detector(s) so to place them into an alarm state. Verify the proper function of the MGS-402 and MGS-410 audio / visual alarm functions as well as verify the proper function of connected relay peripherals and analog and Modbus monitoring devices. Though Bacharach recommends a full system test with calibration span gas, there may be circumstances where the customer wishes to check the relay peripheral device function without applying span gas. This can be accomplished through the following steps: � Power off the MGS-402 Controller � Remove the front cover and change the DIP Switch selection for the relay state to the opposite of the intended function. SWITCH #1 (For instance, if FAIL SAFE Operation is ENABLED, then DISABLE it). � Replace the front cover and return power to the MGS-402 Controller. � After warm up, verify that the relay peripheral devices are in their intended alarm / fault state. � Remove power to the MGS-402, and return the relay switches (SWITCH #1) to their original state. � Replace the front cover and return power to the MGS-402. � After warm up, verify that the relay peripheral devices are in their normal, non-alarm state.
18 1100-2570 Rev 1

MGS-402 User Manual
5. Modbus

5.1 Modbus Overview
Modbus RTU protocol is utilized both for down line detector communication and up line BMS communication. Communication parameters may be set via the configuration switches. The MGS-402 controller acts as a Modbus master device on the detector side, and as a Modbus slave device on the BMS side. Refer to the MODBUS tables found on page 15.
5.1.1 SLAVE NODE ADDRESS
This is the Modbus node address (10, 20, 30, 40, 50, 60, 70 or 80) that the upstream BMS will need to use when sending queries to the controller.
5.1.2 SLAVE BAUD RATE
The MGS-402 controller will us this baud rate to communicate with the upstream BMS or Modbus master device, either 9600 (default) or 19200.
5.1.3 SLAVE PARITY
This PARITY setting should match the BMS PARITY (NONE, EVEN or ODD).
5.1.4 SLAVE STOP BIT
The number of stop bits (1 or 2) must match the BMS setting.
5.1.5 SLAVE TERMINATION
A 120 ohm termination resistor can be enabled on the BMS connection. This is typically only required for cable lengths in excess of 1,000 ft (304 m), for shorter distances set this termination to OUT.
5.2 Modbus Registers

Read Write

Func Code 04 (read input registers)

Item Group

Notes

R X 30001 R X 30002

Sensor 1 is monitored flag

Sensor 1

Sensor 1 communication status Sensor 1

0 = Not Monitored 1 = Monitored
1 = Normal 2 = Failsafe

19 1100-2570 Rev 1

MGS-402 User Manual

Read Write

Func Code 04 (read input registers)

Item Group

Notes

R X 30003 R X 30004 R X 30005
R X 30006 R X 30007 R X 30008 R X 30009 R X 30010 R X 30011 R X 30012
R X 30013 R X 30014 R W 30015 R X 30016 R X 30017
R X 30018 R X 30019 R X 30020 R X 30021 R X 30022 R X 30023 R X 30024 R X 30025 R X 30026

Sensor 1 Modbus error code Sensor 1 concentration Sensor 1 status code

Sensor 1 Sensor 1 Sensor 1

Sensor 1 Fault code (high byte) Sensor 1 sensor fault code Sensor 1 � C Sensor 1 Cal expired flag

Sensor 1 Sensor 1 Sensor 1 Sensor 1

Sensor 1 Low alarm flag

Sensor 1

Sensor 1 High alarm flag

Sensor 1

Sensor 1 Saturation flag

Sensor 1

Sensor 1 Underflow flag

Sensor 1

Sensor 1 Instrument Type code Sensor 1 Node Address
Sensor 1 Sensor Type code
Sensor 1 Concentration Units

Sensor 1
Sensor 1 Sensor 1 Sensor 1

Sensor 1 Scale Factor

Sensor 1

Sensor 1 Gas Type Text Char 1,2 Sensor 1 Sensor 1 Gas Type Text Char 3,4 Sensor 1

Sensor 1 Gas Type Text Char 5,6 Sensor 1

Sensor 1 Gas Type Text Char 7,8 Sensor 1

Sensor 1 Gas Type Text Char 9,10
Sensor 1 SID Text Char 1,2

Sensor 1 Sensor 1

Sensor 1 SID Text Char 3,4

Sensor 1

Sensor 1 SID Text Char 5,6

Sensor 1

Exception code from Modbus standard 0-65535 0 = Offline 1 = Warm-up 2 = Online Sensor specific Sensor specific Sensor specific 0 = Cal Valid 1 = Cal expired 0 = No Alarm 1 = Alarm 0 = No alarm 1 = Alarm 0 = Unsaturated 1 = Saturated 0 = Normal 1 = Underflow 1 = MGS400
1-254 Sensor specific 1 = ppm 2 = ppb 3 = %VOL 4 = %LEL Power of 10 used on concentration, divide conc by 10^x for ASCII characters ASCII characters
ASCII characters
ASCII characters
ASCII characters
ASCII characters
ASCII characters
ASCII characters

20 1100-2570 Rev 1

Read Write

MGS-402 User Manual

Func Code 04 (read input registers)

Item Group

Notes

R X 30027

Sensor 1 SID Text Char 7,8

Sensor 1

R X 30028

Sensor 1 UID Text Char 1,2

Sensor 1

R X 30029

Sensor 1 UID Text Char 3,4

Sensor 1

R X 30030

Sensor 1 UID Text Char 5,6

Sensor 1

R X 30031

Sensor 1 UID Text Char 7,8

Sensor 1

R X 30032

Sensor 1 Alias Text Char 1,2

Sensor 1

R X 30033

Sensor 1 Alias Text Char 3,4

Sensor 1

R X 30034

Sensor 1 Alias Text Char 5,6

Sensor 1

R X 30035

Sensor 1 Alias Text Char 7,8

Sensor 1

R X 30036

Sensor 1 Alias Text Char 9,10 Sensor 1

R X 30037

Sensor 1 Alias Text Char 11,12 Sensor 1

R X 30038

Sensor 1 Alias Text Char 13,14 Sensor 1

R X 30039

Sensor 1 Alias Text Char 15,16 Sensor 1

R X 30051-30100 SENSOR 2 DATA GROUP (REPEAT OF SENSOR1)

R X 31000

Sensor 1 Concentration

Sensor 2 Sensor 1

R X 31001

Sensor 2 Concentration

Sensor 2

R X 31032

Sensor 1 Fault code (high bytes) Sensor 1

R X 31033

Sensor 1 Fault code

Sensor 1

R X 31034

Sensor 2 Fault code (high bytes) Sensor 2

R X 31035

Sensor 2 Fault code

Sensor 2

ASCII characters ASCII characters ASCII characters ASCII characters ASCII characters ASCII characters ASCII characters ASCII characters ASCII characters ASCII characters ASCII characters ASCII characters ASCII characters

Func Code 03/06 (Read/preset)

R X 40002

RS-485 Node Address

R X 40003

Baud Rate

R X 40004

Stop Bits

Item Group

Controllerrelated
Controllerrelated
Controllerrelated

1-254
0 = 9600 1 = 19200 1 or 2

Notes

Read Write

21 1100-2570 Rev 1

MGS-402 User Manual

Read Write

Func Code 03/06 (Read/preset)

Item Group

Notes

R W 40005
R X 40006 R W 40007 R W 40008 R W 40009 R X 40010 R X 40011 R X 40012 R X 40013 R X 40014 R W 40015 R W 40016 R W 40017 R X 40018 R X 40019 R X 40020 R X 40021 R X 40022 R X 40023 R W 40024 R W 40026

Parity
Controller UID Char 1,2
Controller UID Char 3,4
Controller UID Char 5,6
Controller UID Char 7,8
16 bit Current Fault Code Controller 16 bit Last Fault Code Controller Software Version Major
Software Version Minor
Software Version Build
Relay 1 Contact Behavior / Failsafe Relay 2 Contact Behavior / Failsafe Relay 3 Contact Behavior / Failsafe 24V supply voltage x 100 24V supply output to sensors voltage x 100 Battery voltage x 100 Controller 3.3V supply voltage x100 Controller temperature x100 Controller tact and mag switch state Buzzer enable
Fault Latching Enabled

Controllerrelated
Controllerrelated Controllerrelated Controllerrelated Controllerrelated Controllerrelated Controllerrelated Controllerrelated Controllerrelated Controllerrelated Controllerrelated Controllerrelated Controllerrelated Diagnostics Diagnostics
Diagnostics Diagnostics
Diagnostics
Diagnostics
Controllerrelated Controllerrelated

0 = None 1 = Odd 2 = Even ASCII characters
ASCII characters
ASCII characters
ASCII characters
0-65535
0-65535
0-255
0-255
0-255
0 = Normal 1 = Failsafe 0 = Normal 1 = Failsafe 0 = Normal 1 = Failsafe 2400 = 24.00V 2400 = 24.00V
300 = 3.0V 330 = 3.30V
2500 = 25.00degC Sum of activated switch values
0 = Disabled 1 = Enabled 0 = Disabled 1 = Enabled

22 1100-2570 Rev 1

Read Write Type

MGS-402 User Manual

Func Code 02 (read input status)

R X 10001 R X 10002 R X 10003 R X 10004 R X 10005 R X 10006 R X 10007 R X 10008 R W 10009 R X 10200 R X 10201 R X 10202

Sensor 1 Low Alarm Flag (0 or 1 = alarm) Sensor 2 Low Alarm Flag (0 or 1 = alarm) Sensor 1 High Alarm Flag (0 or 1 = alarm) Sensor 2 High Alarm Flag (0 or 1 = alarm) Sensor 1 Any Alarm Flag (0 or 1 = alarm) Sensor 2 Any Alarm Flag (0 or 1 = alarm) Sensor 1 Fault Flag (0 or 1 = fault) Sensor 2 Fault Flag (0 or 1 = fault) Sensor 1 enabled flag (0=disabled 1=enabled) Relay 1 State (0 or 1 = energized) Relay 2 State (0 or 1 = energized) Relay 3 State (0 or 1 = energized)

Item Group
Sensor 1 Sensor 2 Sensor 1 Sensor 2 Sensor 1 Sensor 2 Sensor 1 Sensor 2 Sensor 1 Controller-related Controller-related Controller-related

23 1100-2570 Rev 1

MGS-402 User Manual
6. Diagnostics & Troubleshooting

6.1 FAULT CODES

Code

Critical Fault

Possible Causes

Remedy

0001 CHASSIS TEMP

Chassis temperature outside the range Reduce ambient temperature or check for

of -40 to +50C

power supply malfunction.

0002

RS485 MSTR BUFR Buffer overflow communicating with detectors

Disable all but one channel, use Modbus MASTER traffic screen to one CH at a time.

0004 0008 0010 0040 0200 0400 1000
2000
4000

RS485 SLAVE BUFR Buffer overflow communicating with BMS Use Modbus SLAVE traffic screen to diagnose.
RS485 MSTR CRC CRC error communicating with detectors Disable all but one channel, use Modbus MASTER traffic screen to one CH at a time.

RS485 SLAVE CRC CRC error communicating with BMS

Use Modbus SLAVE traffic screen to diagnose.

RS485 SL TMOUT Modbus timeout communicating with BMS Use Modbus SLAVE traffic screen to diagnose.

STUCK KEY ERROR On or more keys on the keypad are stuck down

Use KEYPAD TEST to determine stuck key, consult factory.

CONFIG ERROR

All detectors are disabled or there are Enable one or more channels, or check for

duplicate node addresses

duplicate node address assignment.

SENSOR RESPONSE One or more detectors are not responding to queries

SUPPLY VOLTS ERR One or more power supply voltages are out of range

CPU ERROR

Microcontroller malfunction

Disable all but one channel, use Modbus MASTER traffic screen to test one CH at a time
Check POWER screen in diagnostic menu, if SUPPLY OUT is <23.7V check for short or overload on detector supply feed.
Reset or reboot controller, if fault persist, consult factory.

8000 EEPROM ERROR EEPROM malfunction

Consult factory.

24 1100-2570 Rev 1

MGS-402 User Manual
7. Additional Information

7.1 Disposing of Instrument
EU-wide regulations governing the disposal of electrical and electronic appliances which have been defined in the EU Directive 2012/19/EU and in national laws have been effective since August 2012 and apply to this device.
Common household appliances can be disposed of using special collecting and recycling facilities. However, this device has not been registered for household usage. Therefore it must not be disposed of through these channels. The device can be returned to your national Bacharach Sales Organization for disposal. Contact Bacharach if you have any questions.

7.2 Technical Specifications

Product Attributes Operating Temperature User Interface Common Alarm Relays
Fault Alarm Relays Analog Output Alarm Silence
Serial Ports
Power Size (WHD) Approximate Weight Approximate Cable Entries
Approvals

Description
-40O F - +122O F (-40O C - +50O C) Front panel push buttons; DIP switches 1 Low Alarm (10 A) @ 250 VAC 1 High Alarm (10 A) @ 250 VAC 1 Fault (10 A) @ 250 VAC 2 Configurable 4-20 mA, 1-5, 2-10 VDC 2 Front Panel Push Buttons 1 Auxiliary Input 1 RS485 Modbus RTU Slave for BMS/BAS 1 RS485 Modbus RTU Master for Gas Detectors 100-240 VAC, 50/60 HZ, 20W (max) 6.5" 6.5" 3.4" (165 � 165 � 87 mm) 1 lb. 11.07 oz (758 g) 2 M20 / 0.5" Conduit (Power) 6 M16 Cable Glands (Communications or Power) CE, UL/CSA/IEC EN 61010-1

25 1100-2570 Rev 1

MGS-402 User Manual
8. Parts and Accessories

8.1 Part Numbers

Part # 6702-8020

MGS-402 Controller

Description

8.2 Service Center Locations
Prior to shipping equipment to Bacharach, visit www.mybacharach.com for a Returned Merchandise Authorization Number (RMA #). All returned goods must be accompanied by a RMA #. Pack the equipment securely (in its original packing, if possible), as Bacharach cannot be held responsible for any damage incurred during shipping to our facility.

Location

Contact Information

Shipping Address

United States

Phone: +1 724 334 5000 Toll Free: +1 800 736 4666 Fax: +1 724 334 5001 Email: help@mybacharach.com

Bacharach, Inc. 621 Hunt Valley Circle New Kensington, PA 15068, USA ATTN: Service Department

Europe

Phone: +353 1 284 6388 Fax: +353 1 284 6389 Email: help@mybacharach.com

Bacharach, Inc. Unit D12 & D13 Santry Business Park, Swords Road Santry, Dublin, Ireland ATTN: Service Department

Canada

Phone: +1 905 882 8985 Fax: +1 905 882 8963 Email: support@bachcan.ca

Bacharach, Inc. 10 West Pearce Street, Unit 4 Richmond Hill, Ontario. L4B 1B6, Canada ATTN: Service Department

26 1100-2570 Rev 1

MGS-402 User Manual THIS PAGE LEFT BLANK INTENTIONALLY.
27 1100-2570 Rev 1

MGS-402 User Manual

Bacharach, Inc. 621 Hunt Valley Circle, New Kensington, PA 15068 USA

Pittsburgh, PA USA | Dublin, IRE | Stanardsville, VA USA | Toronto, CAN

www.mybacharach.com | help@mybacharach.com

1100-2570 Rev 1