KEB COMBIVERT F5 Applications Manual page 17

Problem
Motor does not go the correct
speed or cannot reach high
speed.
Cannot lift full load
Unable to run induction motor
in open loop.
Motor only moves one
direction; direction of
weighting (e.g. full load
escalator in down direction)
Output current is limited
(clamped)
Output current is limited
(clamped)
Cause/Solution/Troubleshoot
Check whether the Command Speed and Encoder Speed match
(CP27 command speed and CP28 Encoder 1 speed) .
Check Input Status, CP25, to determine whether the correct inputs are
being signaled for a run command.
Check whether the (Voltage) Modulation Grade is reaching 100%. Refer
to Voltage Modulation Grade limited reached for further troubleshooting.
Check if the Inverter Peak Current limit is being reached.
Check if the speed control gains (KP Proportional, KI Integral Offset) are
set too low.
Check the motor current and whether the Inverter Peak Current
limit is 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
to be increased or decreased if reaching the Inverter Peak Current.
Low Speed Torque Boost, CP19 may need to be decreased or
increased.
Verify there are no mechanical issues preventing the motor from
rotating freely.
Check the motor current. Refer to Motor Draws High Current for
additional troubleshooting.
Check the Command Speed for dictated speed direction and whether it
changes between directions.
Verify the current is not being limited by the Inverter Peak Current Limit.
Check if motor current is excessive. Refer to Motor Draws High
Current for additional troubleshooting.
Verify the current is not being limited by the Inverter Peak Current Limit.
Check if motor current is excessive. Refer to Motor Draws High
Current for additional troubleshooting.
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