Product overview, Stand alone regulator (sar), Gate amplifier – Rockwell Automation 23P PowerFlex DC Stand Alone Regulator and Gate Amplifier User Manual
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Rockwell Automation Publication 23P-UM001D-EN-P - July 2012
Chapter 1 Introduction
Product Overview
The PowerFlex DC Stand Alone Regulator (SAR) and Gate Amplifier products
provide an integrated solution for controlling external DC power modules.
Stand Alone Regulator (SAR)
The SAR is a DC drive regulator that provides armature regulation, armature
SCR gate signals and a regulated field supply. The SAR field supply consists of a
single phase, two quadrant (non-reversing,) full wave rectified bridge, available as
40 or 70 Amps. The SAR supports an AC line input voltage range of 230VAC to
690VAC and a field input voltage range of 100VAC to 460VAC.
The SAR uses feedback signals from the AC input line to monitor the incoming
voltage level in order to establish the SCR gate firing sequence relative to the AC
line. The SCR gate firing for the field bridge is established from the AC lines that
supply the field, independent of the armature firing circuit. DC feedback signals
are used to monitor the output voltage from the power module. Additionally,
current signals received from current transformers is used by the SAR regulator to
monitor and control current. The SAR catalog numbers are listed in
. The SAR must be used with the Gate Amplifier in order to
interface with a DC power module(s).
Gate Amplifier
The Gate Amplifier is used to amplify the SCR gate signals supplied by a DC
drive regulator. The gate signal source to the Gate Amplifier can be provided by
either the PowerFlex DC SAR, or the SD3000
PLUS. The Gate Amplifier unit
provides a separate input D-Shell connector for each product. The Power
Module Interface (PMI) Rack is also compatible with the Gate Amplifier and
uses the SD3000
PLUS inputs. The Gate Amplifier model number and
corresponding connection cables part numbers are listed in
.
In addition to amplifying the gate signals, the forward and reverse signals
provided by the Gate Amplifier are “fanned-out” to enable the driving of multiple
power modules. Four S6 bridges forward and four S6 bridges reverse. When the
S6 bridges are connected in an anti-parallel configuration, the topology is an S6R
providing both motoring and regenerative capability.
The external 48V gate power supply capability of the Gate Amplifier provides the
means to supply additional gate current and voltage and also support the firing of
gate coupler boards connected in series (which requires additional voltage).
Connecting gate couplers in series forces the simultaneous firing of the SCRs,
with power connections in series or parallel. An internal “diode OR” circuit
ensures that the gates are powered by whichever gate power supply voltage is the
greater in amplitude, the internal or the external power supply.