Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control - Manual (Page 397)

Component Definition and Maintenance 6-93
7000 “A” Frame 7000A-UM150F-EN-P –June 2013
There is a separate SCB for each DCB, and they are labeled SCB-L and
SCB-M. These boards are NOT the same and therefore not
interchangeable. They are separate part numbers. The main reasoning for
the difference is that Current Feedback from the Line-Side Current
Transformers and Current Feedback from the Machine-Side Hall Effect
sensors requires different scaling resistors. These resistors are mounted
directly on the boards for drives with lower current requirements. A drive
with higher current requirements may require an external parallel resistor
connected across the CT/Hall Effect sensor input plug connector.
There are two LEDs on the SCB labeled D2 and D3. D2 is the ±15V DC
voltage-OK signal, and D3 is the +5V DC voltage-OK signal.
Signal Conditioning Board Replacement
To replace the Signal Conditioning Boards,
1. Ensure that all medium voltage and control voltage power to the drive
is isolated and locked out.
2. Note and Mark the location and orientation of all the ribbon cables,
plugs, and connectors into the SCB-L or SCB-M. Use the electrical
drawing as a reference.
3. Using your static strap, disconnect all of the connections.
4. Remove the SCB from the low voltage control cabinet. Verify that
the new part number matches the part number on the old SCB.
Installing the SCB-L in the place of the SCB-M (or the opposite) can
result in serious damage to the drive as the feedback scaling will be
wrong.
5. Install the new SCB in the low voltage control cabinet.
6. Reconnect all plug connections and verify the locations.
7. Apply Low Voltage power and complete a System Test and Medium
Voltage tests to ensure the new board functions properly.