KEB COMBIVERT F5 Reference Manual page 304

Diagnostics and Troubleshooting
Item #
Check whether Maximum
Torque setting is reached
and high enough for normal
operation.
304
Check/Solution
The LC30 Maximum Torque is used to limit the output current to the
motor. It is primarily to protect the motor from extreme or prolonged
high currents, which may occur during initial setup or troubleshooting.
The limiting current can be calculated as LM07 Motor Torque x LC30
Maximum Torque (%) / LM03 Motor Current.
Under normal operation, this will typically need to be set in the range
of 200-250%.
Anytime any of the LM Motor Data parameters are changed, the LC30
Maximum Torque will be reset to 150%. This may be too low for normal,
automatic operation.
Anytime a keypad operator and drive are synched, the LC30 Maximum
Torque will be reset to 150%. This may be too low for normal, automatic
operation.
The maximum output current rating of the inverter will be the limiting
factor, if reached. The LC30 Maximum Torque setting will not provide
a current beyond the drive's peak rating.
If the maximum torque limit is being reached, this may be due to:
Incorrect Motor Data. Refer to Motor Data Incorrect for additional
information.
Encoder Position Incorrect. Refer to Encoder/Motor Pole Position
Incorrect
Mechanical Issues (eg. Brake not releasing)
For open loop induction motors, the LC32 Low Speed Torque Boost
may be too high or too low.