166
Diagnostics and Troubleshooting
Problem Cause/Solution/Troubleshoot
Motor does not go the correct
speed or cannot reach high
speed.
Check whether the Command Speed (LF.88) and Encoder Speed
(LF.89) match .
Verify whether the Motor (Encoder) Speed is tracking the Command
Speed.
Check whether the Machine Data parameters (LF.20-25) are set correct.
Check whether the (Voltage) Modulation Grade (ru.27) is reaching
100% . Refer to Voltage Modulation Grade limited reached for further
troubleshooting.
Check whether the Maximum Torque Limit (0.LF.36) or Inverter Peak
Current limit are being reached.
Check if the speed control gains (KP Proportional, KI Integral Offset) are
set too low.
Overshoot into  oor Check the motor current, whether the Maximum Torque Limit or
Inverter Peak Current limit are being reached.
Check whether the Motor (Encoder) Speed is tracking the Command
Speed.
Check if the speed control gains (KP Proportional, KI Integral Offset) are
set too low. Raise as needed.
Cannot lift full load Check the motor current, whether the Maximum Torque Limit or
Inverter Peak Current limit are being reached. Refer to Motor
Draws High Current for additional troubleshooting.
Check if the speed control gains (KP Proportional, KI Integral Offset) are
set too low.
For open loop induction motors, the Low Speed Torque Boost may
need increased or decreased if reaching the Maximum Torque Limit or
Inverter Peak Current.
Motor only moves one
direction; direction
of weighting (e.g.
counterweights pulling up for
empty car)
Check the motor current. Refer to Motor Draws High Current for
additional troubleshooting.
Check the Command Speed for dictated speed direction and whether is
changes between directions.
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