Maintenance
Troubleshooting
288 MagneMotion
Rockwell Automation Publication MMI-UM007F-EN-P - September 2020
Motor reports ‘Not in operational
mode’.
All motors currently enter this
state for 100 ms, and then auto-
matically exit. This state allows
sampled A/D inputs and observ-
ers settle before using this data.
There is no lockout of behavior
that is based on this fault, this
fault is informational only.
Wait 100 ms after reset or power
on before sending any commands
to the motor.
After power cycling, the HVDC
propulsion power line multiple
times, the motor drive does not
clear the undervoltage fault.
The PTC used to limit inrush cur-
rent eventually heats up enough
that it goes to a high-resistance
state. This state does not allow the
motor drive to power up enough
to clear the undervoltage fault.
Turn off the HVDC power supply
for a few minutes to allow the
PTC to cool down sufficiently to
allow proper resumption of opera-
tion upon reapplication of the
HVDC power source.
Make sure that there is a mini-
mum of 2 minutes between turn
on cycles and 20 seconds between
turn off and turn on (power
cycle). Additionally, monitor the
Soft Start Off bit to make sure it is
set before turning the propulsion
power back on.
The motor reports an undervolt-
age fault.
Power being supplied to the
QSMC controller is below +250V
DC. See Undervoltage Fault on
page 243.
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 +270V DC.
Table 8-3: Power-Related Troubleshooting (Continued)
Symptom Problem Description Corrective Action
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