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2.3.4 HOW TO DETERMINE THE CAUSES OF OTHER PROBLEMS
The following table provides a listing of other problems, their possible causes and remedies.
Problems Causes and remedies
The motor runs in the wrong
direction.
･Inverter the phases of the output terminals U, V and W.
･Inverter the forward/reverse run-signal terminals of the external input device.
･Change the setting of the parameter
in the case of panel operation.
The motor runs but its speed
does not change normally.
･The load is too heavy. Reduce the load.
･The soft stall function is activated. Disable the soft stall function.
･The maximum frequency
and the upper limit frequency are set too low.
Increase the maximum frequency
and the upper limit frequency .
･The frequency setting signal is too low. Check the signal set value, circuit, etc.
･Check the setting characteristics (point 1 and point 2 setting) of the frequency setting signal parameters.
･If the motor runs at a low speed, check to see that the stall prevention function is activated because the
torque boost amount is too large.
Adjust the torque boost amount (
) and the acceleration time ( ).
The motor does not accelerate
or decelerate smoothly.
･The acceleration time (
) or the deceleration time ( ) is set too short .
Increase the acceleration time (
) or the deceleration time ( ).
A too large current flows into the
motor.
･The load is too heavy. Reduce the load.
･If the motor runs at a low speed, check whether the torque boost amount is too large.
The motor runs at a higher or
lower speed than the specified
one.
･The motor has an improper voltage rating. Use a motor with a proper voltage rating.
･The motor terminal voltage is too low.
Check the setting of the base frequency voltage parameter (
).
Replace the cable with a cable larger in diameter.
･The reduction gear ratio, etc., are not set properly. Adjust the reduction gear ratio, etc.
･The output frequency is not set correctly. Check the out put frequency range.
･Adjust the base frequency.
The motor speed fluctuates
during operation.
･The load is too heavy or too light. Reduce the load fluctuation.
･The inverter or motor used does not have a rating large enough to drive the load.
Use an inverter or motor with a rating large enough.
･Check whether the frequency setting signal changes.
･If the V/F control selection parameter
is set at 3, check the vector control setting, operation condition, etc.
Parameter settings cannot be
changed.
･Change the setting of the parameter
(prohibition of change of parameter setting) to (permitted) if
it is set at
(prohibited).
･For reasons of safety, some parameters cannot be reprogrammed while the inverter is running.
How to cope with parameter setting-related problems
If you forget parameters
which have been reset
･You can search for all reset parameters and change their settings.
If you want to return all reset
parameters to their
respective default settings
･You can return all parameters which have been reset to their default settings.
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