Rockwell Automation 23P PowerFlex DC Stand Alone Regulator and Gate Amplifier - Manual (Page 61)

Rockwell Automation Publication 23P-UM001D-EN-P - July 2012 61
Retrofit Guidelines Chapter 4
Figure 27 - Retrofit of Non-Rockwell Power Module (S6R) w/Gate Coupler
Assembly
To interface the Gate Coupler Assembly to the SCR gates, the SD3K-
CBLCPLR072 cables are used (as shown in the diagram above). The labeling on
the SD3K-CBLCPLR072 cable set identifies the SCRs as THY1,
THY2,…THY6. The same cable set is used for both forward and reverse. If the
forward and reverse gate labeling are needed, then SD3K-CBLBOXA048 (or
SD3K-CBLBOXB048 for the S6R), 48 inch cables can be used instead of the
SD3K-CBLCPLR072, 72 inch cables.
Gate Interface to Reliance
Electric U.S. Power
Modules, Retrofit
To interface to the SCR gates of a Reliance Electric U.S. power module, a Gate
Scaling Module is used in the SCR gate circuit. The Gate Scaling Module inserts
a resistor into each of the SCR gate circuits to reduce the gate drive current. This
is necessary because the gate driver voltage from the Gate Amplifier is 28V versus
the 18V that would be produced by the Distributed Power System, Power
Module Interface (PMI) rack. The reduced drive current ensures that the
resistors on the primary side of the gate coupler transformer are running well
within their maximum power dissipation ratings. The most common type of gate
coupler used in the Reliance Electric power modules is the O-51378-19. There
are several variations of the O-51378-19 gate coupler with regard to physical
interface methods, but the basic components are the same. To confirm this,
compare the schematic of the O-51378-19 gate coupler with the schematic of the
gate couplers of the retrofit power module. The Gate Scaling Module was
designed to interface the Gate Amplifier to a Reliance Electric power module
with O-51378-19 gate couplers or electrically equivalent gate couplers.
The cables between the Gate Amplifier
and the Gate Scaling Module are the
SD3K-CBLGSCLIFxxx (forward) and SD3K-CBLGSCLIRxxx (reverse). The
output cables to the power modules are dependent on the power module type.
One type uses the “round” style of connector and an older line of the power
module uses a “rectangular” style of connector. Cables appear in the following
tables.
Gate Amplifier
FWD GATES
REV GATES
(Drawing 97305100)
(Drawing 97305300)
SD3K-CBLFWDPMxxx
SD3K-CBLREVPMxxx
Power
Module
FWD
REV
Gate Coupler Assembly
SD3K-GATMDLHIGH
(9732017* to view drawing)
(Drawing 97329101)
SD3K-CBLCPLR072
(Make as short as possible.
Do not route with power leads.)
TB
(Recommended)
TB
(Recommended) Gate Coupler Assembly
SD3K-GATMDLHIGH
(9732017* to view drawing)
(Drawing 97329101)
SD3K-CBLCPLR072
(Make as short as possible.
Do not route with power leads.)