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SR-19900
Introduction
For applications requiring a shunt regulator, Galil offers a small mountable model that can be
configured for varying voltage levels. Two fixed voltage threshold settings are available with jumpers,
which can be set at either 33 or 66 volts. Additionally, a user defined voltage threshold can be set by
changing a simple resistor. This shunt regulator operates with hysteresis, where the regulator switches
on at the set voltage threshold and switches off at 2 volts below.
The shunt regulator should be placed in parallel with the power supply as in the figure below, and it
should be mounted to a metal surface using thermal grease to aid in heat transfer. Connections are
made to the unit at VS (voltage supply) and PG (power ground) using either the 4-pin Molex
connector or the 8-pin Mate 'N Lock connector (AMP# 770579-1).
For a summary of shunt regulator operation, as well as details to help determine if one is required in
your system, please refer to application note #5448 at:
(http://www.galilmc.com/support/appnotes/miscellaneous/note5448.pdf).
Figure 1 Shunt Regulator Placement in a Typical Servo System
CDS-3310
DCPower
Supply
+
SR-19900
Shunt
Regulator
+
GND
PWM
Controller
MOCMDx
Amplifier
AEN
-
-
M+
Motor
M-
Encoder
System Load
(Inertia)
i
Appendices
93
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