Rockwell Automation 20G PowerFlex SCR Bus Supply - Manual (Page 40)

2-6 Start Up/Troubleshooting
PowerFlex SCR Bus Supply User Manual
Publication 20S-UM001G-EN-P
Troubleshooting Table 2.B Possible Faults and Corrective Actions
Fault Cause Corrective Action
Heat sink
Overtemperature Heat sink temperature
exceeds maximum rating 1. Verify that maximum ambient temperature has
not been exceeded.
2. Check Overtemperature Switch (N.C. contacts)
at control terminals 10 and 11.
3. Check 115V AC supply input voltage at control
terminals 0 and 115.
4. Check blower for correct operation.
5. Check for excess load on the bus supply.
6. Check for minimum mounting clearance around
the bus supply.
7. Contact your local RA sales office.
DC Output
Voltage Loss DC bus:
- Short Circuit FAULT [2] or
- Low Line
FAULT [4] or
- No Load ALARM [7]
Refer to Table 2.A .
1. Check 3-phase AC incoming power for
undervoltage or phase loss.
2. Check all Bus Supply fuse trip indicator switches.
3. Verify the Inverter is connected.
4. Verify the power of the connected Inverter(s) is
minimum 7.5 kW (10 HP). Refer to the 2nd
Attention statement on
page 2-1 .
5. Contact your local RA sales office.
Loss of 115V AC power 1. Check 115V AC supply input voltage at control
terminals 0 and 115.
2. Check Enable Contactor function.
3. Contact your local RA sales office.
Jumper setting
wrong Wrong jumper settings:
Single phase (1-ph) line
type and one or both of the
SPARE 1 or SPARE 2
jumpers set to their
respective left positions.
1. Check the jumper setting(s).
2. Set the jumper(s) correctly.