Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 209)

4-50 Commissioning
7000-UM150I-EN-P – June 2013 7000 “B” Frame
SCR Firing Test
In normal operation, the SCR firing cards derive their power from a
voltage divider network that steps down the medium voltage to 20
volts maximum. As it is necessary to perform this test while isolated
from medium voltage, a secondary source of power has to be
provided to power the firing cards.
Supplied with each drive is a power cable that supplies 20 V DC
from the DC/DC Converter power supply to the firing cards (SPGDB).
This cable has one input to be connected to the DC/DC converter,
and 18 sets of outputs that can be connected to the SCRs. The
firmware ensures that this is achieved.
The procedure is as follows:
Plug the 4-pin Phoenix connector on the test cable into the DC/DC
converter terminal labeled PB3. The other 3-pin connectors plug into
the SCR self powered gate drive board terminals labeled TB3 – Test
Power (See Figure 4.17 – Self-Power Gate Driver Board Test Power
Terminal).
Test power connection
LED
Figure 4.17 – Self-Powered Gate Driver Board Test Power Terminal