STP DRVA RC 050 Regeneration Clamp Data Sheet Surestepclamp Datasheet

User Manual: STP-DRVA-RC-050 Regeneration Clamp Data Sheet SureStep™ Stepping Systems User Manual - AutomationDirect

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INTERNAL POWER RESISTOR

STEPPING SYSTEMS

FEATURES

STP-DRVA-RC-050 REGENERATION CLAMP
(FOR USE WITH 24–80 VDC POWERED STEPPER AND SERVO DRIVES)

The STP-DRVA-RC-050 Regen Clamp is mounted on a heat sink
and has a 50 watt power resistor for more continuous current
handling.

Sure Step™ Regen Clamp Specifications
Part Number

STP-DRVA-RC-050

Voltage Range

24 to 80 VDC, no user adjustments

FILTER CAPACITOR

Peak Power

800W

A large capacitor is added across the voltage output to smooth
out operation and allow the “clamp” to work at a low switching
frequency.

Continuous Power 50W
Connection

6-pin screw terminal block accepts 12–18 AWG wire

Indicators

Green LED: Indicates power supply voltage is present.
Red LED: Indicates that the clamp is operating.
(This is typically a very short time, since it is only on while
the stepper/servo is decelerating.)

Protection

The power supply is internally connected to an “Input Diode”
that protects it from higher regeneration voltages. The diode
protects the system from connecting the power supply in
reverse. If the clamp were to fail, the diode would continue to
protect the power supply from over-voltage.

Agency Approvals

RoHS

The regeneration circuit is designed to provide a wide range of
voltage clamping operation with a simple and reliable design. The
block diagram gives a simplified view of the circuit design
showing the major parts.

As with most stepper and servo systems, a clamp circuit is
required to limit increased power supply bus voltage when the
motor is decelerating under load. This is commonly referred to as
“regeneration,” which is what happens when DC motors are
driven by their load. During regeneration the DC motor can
produce enough voltage to actually exceed the input power
supply voltage. More sophisticated stepper and servo drives deal
with this by channeling the increased motor voltage back to the
source power supply. If the voltage is not clamped to a safe level
the amplifier can be damaged or destroyed.
For this reason AutomationDirect offers a “Regen Clamp” module
for our stepper/servo drive products. With this module one or
more stepper/servo drives can be protected from “Over Voltage”
conditions by placing the clamp module between the power
supply and the drive. The clamp tracks the input power supply
and will operate from 24 to 80 volts. No adjustments are needed.
The Regen Clamp is designed to handle a wide range of conditions. The voltage input matches the needs of the SureStep
stepper drives and SureServo servo drives by providing 24 to 80
VDC capabilities. External power resistors, such as STP-DRVABR-100, can be added for even greater continuous power requirements. The modules are small and compact to minimize impact
on the system design. More than one stepper/servo drive can be
connected to the clamp module, with the potential to handle an
entire multi-axis system.

Data Sheet: STP-DRVA-RC_DS, 1st Edition – 10/2012

Sheet 1 of 2

Terminal Block

CLAMP MOSFET

Power
Resistor

INDICATOR LEDS
A green LED is used to indicate power supply input, and a
red LED is used to indicate when the clamp is on.

A single stepper or servo drive is connected to the Regen Clamp
module. This design will work in most cases where the load is
primarily “Frictional,” as opposed to “Inertial.”

GND1

Vout

This part of the clamp senses when an over-voltage occurs.
The clamp will turn on when the “Vout” exceeds the “Vin” by
approximately 1.2 volts. The clamp turns off when “Vout” drops
to about 1 volt below “Vin”.

EXAMPLE 1

Input Diode

Vin

GND2

OVER-VOLTAGE SENSE CIRCUIT

At the heart of the circuit is a power MOSFET designed for
20-amp continuous operation

CIRCUIT DIAGRAM

DESCRIPTION

For moderate power operation, this may be all that is required for
safe operation. This resistor is designed to “sink” up to 8 amps
when using an 80 volt power supply, but only 2.5 amps when
using a 24 volt supply.
Larger power resistors can be added to the circuit by connecting
between the “R1” and the “R2” terminals (STP-DRVA-BR-100).

Over Voltage
Sense Circuit

24–65 VDC
Power
Supply

+

Vin

–

GND1
GND2

R1

Vout

R2

Green LED
Power Indication
Red LED
Clamp Indication

Regen Clamp
STP-DRVA-RC-050

+

STP-DRV-6575
Drive #1

–

Clamp MOSFET

TERMINAL BLOCK
A 6-connection terminal block provides easy connection access to
the clamp. The terminals are designed for wire sizes from 12–28
AWG.

EXAMPLE 2
Two stepper or servo drives are connected to the Regen Clamp
module. This design will work in cases where the load has
significant “Inertial” content.
24–65 VDC
Power
Supply

+

Vin

–

GND1
GND2

INPUT DIODE
The input diode provides over-voltage and reverse-voltage protection. If the input power supply is connected in reverse, this diode
will prevent failure. During over-voltage conditions the diode
blocks the higher regeneration voltage from feeding into the input
power supply. The input is designed to handle 20 amps continuous with peaks greater than 100 amps.

For a complete user manual, please visit www.automationdirect.com

Regen Clamp
STP-DRVA-RC-050

Vout
Resistor
STP-DRVA-BR-100
10Ω 100W

STP-DRV-6575
Drive #2

R1
R2

+

+

–

–

STP-DRV-6575
Drive #1

STEPPING SYSTEMS
STP-DRVA-RC-050 REGENERATION CLAMP
DIMENSIONS
STP-DRVA-RC-050
Dimensions = in[mm]
2.50
[63.5]

4.00
[101.6]

4X Ø0.12
[Ø3.0]

3.75
[95.3]

3.00
[76.2]

0.16
[4.0]

3.69
[93.7]
4-40 UNC

0.24
[6.1]

3X Ø0.12
[Ø3.0]

2.21
[56.2]
1.50
[38.1]

1.25
[31.8]

1.17
[29.7]
1.24
[31.5]

1.20
[30.6]

Data Sheet: STP-DRVA-RC_DS, 1st Edition – 10/2012

0.87
[22.1]

Sheet 2 of 2

For a complete user manual, please visit www.automationdirect.com



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