KEB COMBIVERT F5 Instruction Manual page 173

Item #
Check whether Maximum
Torque setting is reached
and high enough for normal
operation.
Check whether Inverter
Maximum Current Limit is
being reached.
Diagnostics and Troubleshooting
Check/Solution
The 0.LF.36 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:
(0.LF.36 Maximum Torque / LF17 Motor Torque) x LF.12 Motor Current.
Under normal operation, this will typically need to be set in the range
of 200-250%.
The maximum output current rating of the inverter will be the limiting
factor, if reached. The 0.LF.36 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 LF.38 Low Speed Torque Boost
may be too high or too low.
The drive will limit the maximum current to the inverter's peak current
rating. Refer to Section 2.1 and 2.2 for ratings.
If the peak current 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 LF.38 Low Speed Torque Boost
may be too high or too low.
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