Maintenance
Troubleshooting
QuickStick HT User Manual 289
Rockwell Automation Publication MMI-UM007F-EN-P - September 2020
The motor reports an undervolt-
age fault.
Power being supplied to the
QSHT 5700 inverter is below
+350V DC. See Undervoltage
Fault on page 246.
Verify the voltage output from the
power supply.
Verify the voltage at the motor.
Verify that all power wiring is
sufficient to carry all loads and
deliver the proper power to the
motors.
Reduce power cable resistance
between motors that share a com-
mon HVDC power supply.
The fault clears once the power
bus rises above +350V DC.
The motor reports an overvoltage
fault.
Power being supplied to the
QSMC controller is above +430V
DC. See Overvoltage Fault on
page 244.
The fault clears once the power
bus drops below +420V DC.
Verify the voltage output from the
power supply.
Verify the voltage at the motor.
Reduce power cable resistance
between motors that share a com-
mon HVDC power supply.
Reduce maximum speed and/or
maximum acceleration to reduce
the amount of regenerated power
that flows back into the system.
Increase the spacing between
vehicles on motors that share a
common HVDC power supply.
Connect more motors to a com-
mon HVDC power supply to
increase the number of blocks
available to absorb regenerated
power.
Table 8-3: Power-Related Troubleshooting (Continued)
Symptom Problem Description Corrective Action
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