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Diagnostics and Troubleshooting
12.1 Operation Problems
Troubleshooting Operation Problems and potential solutions. Refer to Section 13.2 for additional
Diagnostics Solutions. Additional troubleshooting of learn procedures are listed as well at the end of this
sectoin.
Problem Cause/Solution/Troubleshoot
Motor Does Not Move Check the Motor Current. Refer to Motor Draws High Current for
additional troubleshooting.
Make sure the brake is picking and/or not dragging.
Check the Inverter Status (LF.99) to determine whether there is
indication a run command is being given (i.e. Up/Down Constant Speed/
Acceleration/Deceleration, etc.).
Check Input Status (LF.82) to determine whether the correct inputs
are being signaled for a run command.
Check the Command Speed (LF.88) to determine what the dictated
speed command is.
For analog speed commands, check the Raw (ru.27) and Processed
(Analog) Patterns (ru.28), the Contract Speed Setting (LF.20), and
speed settings for any Pro le.
Check to make sure the speed control gains (KP, KI Offset) are not set
too low.
For open loop induction motors, the the Low Speed Torque Boost may
need to be increased to lift the load or decreased if either the Maximum
Torque of Inverter Peak Current limit is reached.
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