Scr firing test – Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C-Frame) - ForGe Control User Manual
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Rockwell Automation Publication 7000L-UM301D-EN-P - June 2014
Chapter 4
Commissioning
Press Enter and use the down arrow to get to Gating Test. Press Enter, and you
will now be in gating test mode.
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 V DC 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 which supplies 15 V DC from an AC/
DC power supply to the firing cards (SPGDB). This cable has one input to be
connected to an AC source (120/240V, 50/60 Hz) and 18 sets of outputs that
can be connected to the SCR self powered gate driver boards.
The procedure is as follows:
Plug the AC power connector on the test cable into an appropriate AC source.
The other eighteen 3-pin connectors plug into the SCR SPGDB board terminals
labeled TB3 – Test Power (see
– Self-Power Gate Driver Board Test
ATTENTION: Ensure that the drive is no longer running in test mode prior to
applying medium voltage to the drive line-up. Failure to do so may result in
equipment damage.