E6581158
M-8
13
13.4 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.
• Invert the phases of the output terminals U, V and W.
• Invert the forward/reverse run-signal terminals of the external input device.
(See 6.3 "Assignment of functions to control terminals".)
• Change the setting of the parameter HT 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. (See 5.14.)
• The maximum frequency HJ and the upper limit frequency WN are set too low.
Increase the maximum frequency HJ and the upper limit frequency WN.
• The frequency setting signal is too low.
Check the signal set value, circuit, cables, etc.
• Check the setting characteristics (point 1 and point 2 settings) of the frequency setting
signal parameters. (See 6.5.)
• 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 (XD) and the acceleration time (CEE).
(See 5.12 and 5.1.)
The motor does not ac-
celerate or decelerate
smoothly.
• The acceleration time (CEE) or the deceleration time (FGE) is set too short.
Increase the acceleration time (CEE) or the deceleration time (FGE).
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.
(See 5.12.)
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 (XNX) . (See 6.13.6.)
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 output frequency range.
• Adjust the base frequency. (See 5.10.)
The motor speed fluctu-ates
during operation.
• The load is too heavy or too light.
Reduce the load fluctuation.
• he 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 RV is set at 3, check the vector control setting,
operation conditions, etc. (See 5.11.)
Parameter settings cannot
be changed.
Change the setting of the parameter H (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.
(see 4.1.5)
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