Rockwell Automation 23P PowerFlex DC Stand Alone Regulator and Gate Amplifier - Manual (Page 54)

54 Rockwell Automation Publication 23P-UM001D-EN-P - July 2012
Chapter 3 Gate Amplifier Installation and Wiring
Gate Amplifier, Cascade Configurations
It is permissible to cascade Gate Amplifiers. The time delay through the Gate
Amplifier is 0.5 μSec. This amount of time delay is not significant with regard to
the gate firing of parallel power modules. For any configuration with multiple
Gate Amplifiers, be sure to connect the Ready relay into the “Run Permissive”
circuit.
The external +48V power supply cannot be used on a Gate Amplifier or SD3000
PLUS whose output acts as an input source for a “downstream” Gate Amplifier.
The continuous application of the high amplitude gate pulses to the input will
cause excessive heating of the components of the input stage. If the external 48V
power supply is used, the interlocking relay must also be used as described in the
“EXT GATE P/S” section on
page 51 .
Illustrations are included for both the Stand Alone Regulator (see Figure 21
below and Figure 22 on page 55 ) and the SD3000
PLUS (see
Figure 23 on
page 56 and Figure 24 on page 57 ).
Figure 21 - Cascading Gate Amplifiers Using the Stand Alone Regulator
REV Output Cables
SD3K-CBLGSCLIRxxx
+
-
SD3K
FWD IN
SD3K
REV IN
PFDC
Gate Input
FWD
REV
RDY Ext. P/S
120VAC
Gate Amplifier
FWD Output Cables
SD3K-CBLGSCLIFxxx
To Gate Amplifier,
1 of 4, SD3K-FWD Input
To Gate Amplifier,
2 of 4, SD3K-FWD Input
To Gate Amplifier,
3 of 4, SD3K-FWD Input
To Gate Amplifier,
4 of 4, SD3K-FWD Input
To Gate Amplifier,
1 of 4, SD3K-REV Input
To Gate Amplifier,
2 of 4, SD3K-REV Input
To Gate Amplifier,
3 of 4, SD3K-REV Input
To Gate Amplifier,
4 of 4, SD3K-REV Input
+
-
SD3K
FWD IN
SD3K
REV IN
PFDC
Gate Input
FWD
REV
RDY Ext. P/S
120VAC Gate Amplifier
1 of 4
From Gate Amplifier,
FWD Output
From Gate Amplifier,
REV Output
To Forward
Power Modules
To Reverse
Power Modules
+
-
SD3K
FWD IN
SD3K
REV IN
PFDC
Gate Input
FWD
REV
RDY Ext. P/S
120VAC Gate Amplifier
4 of 4
From Gate Amplifier,
FWD Output
From Gate Amplifier,
REV Output
To Forward
Power Modules
To Reverse
Power Modules
Up to Four
Gate Amplifier
PowerFlex DC
Stand-alone Regulator
KPT11
(15 Pin D-Shell)
Field Supply
40 A or 70 A
(2 Quad)
To Motor
Field
Gate Cable
Caution: Do NOT use the external power supply (Ext. P/S)
when the gate pulse output is connected to the input of a
“downstream” Gate Amplifier(s). Only use the external power
supply on a final stage Gate Amplifier(s) that provides the
gate pulses to the power module.
C1 D1 D C W V U 1A1 A1 1A2 A2 1 2 3 4 5 6 7 8
KPT31 KA KP
Power Module
AC / DC
Feedback
Power Module
Armature Voltage
Feedback
Power Module
Thermostat and
CT Feedback
V1 U1
All Terminals are located
on the bottom of the unit.