Toshiba VF-AS1 instruction manual How to check other troubles, More

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13.4How to check other troubles

The following table provides a listing of other troubles, their possible causes and remedies.

Troubles	Causes and remedies
The motor runs in the	•Invert the phases of the output terminals U, V and W.
wrong direction.	•Invert the forward/reverse run signal terminals of the external input device.
	￿ Refer to Section 7.2, Assignment of functions to control terminals.
The motor runs but its	•The load is too heavy.
speed does not change	•Reduce the load.
normally.	•Soft stall function is activated.
	Switch off soft stall function. ￿ Refer to Section 5.14.
	•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, cables, etc.
	•Check the setting characteristics (point 1 and point 2 settings) of the frequency
	setting signal parameters. ￿ Refer to Section 7.3.
	•The base frequency voltage 1 ￿￿￿ is too low.
	•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 (￿￿￿).
	￿ Refer to Section 5.7 and 5.2.
The motor does not	•The acceleration time (￿￿￿) or the deceleration time (￿￿￿) is set too short.
accelerate or decelerate	Increase the acceleration time (￿￿￿) or the deceleration time (￿￿￿).
smoothly.
A too large current flows	•The load is too heavy.
into the motor.	Reduce the load.
	•If the motor runs at a low speed, check whether the torque boost amount is too large.
	￿ Refer to Section 5.7.
The motor runs at a higher	•The motor has improper voltage rating.
or lower speed than the	Use a motor with a proper voltage rating.
specified one.	•The motor terminal voltage is too low.
	Check the setting of the base frequency voltage parameter (￿￿￿).
	￿ Refer to Section 5.8.
	Change the cable for thicker one.
	•The reduction gear ratio, etc., is 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. ￿ Refer to Section 5.8.
The motor speed varies	•The load is too heavy or too light.
during operation.	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 ￿ or larger (￿ and ￿ are
	removed.), check the vector control setting, operation conditions, etc. ￿ Refer to
	Section 5.6.
Some or all of seven keys	•Change panel operation prohibition parameter ￿￿￿￿~￿￿￿￿.
on operation panel don't
work.	* Parameter is occasionally set for key operation prohibition mode. Cancel key
Access to parameter results	operation prohibition mode according to the following procedure.
	To cancel the setting, press and hold down the ENTER key for 5 seconds or
in failure.
	more.
Parameter settings cannot
be changed.	(1)If parameter write protect selection parameter ￿￿￿￿ is set at ￿ (prohibited),
	change the setting to ￿ (allowed).
Monitor (Display) is
	(2)If there is an input terminal that is set for ￿￿￿ (or ￿￿￿) (parameter editing	13
uncontrollable.	enabling ) by input terminal function parameter, turn on the terminal.
How to cope with parameter setting-related problems
If you forget parameters	•You can search for all reset parameters and change their settings.
which have been reset	￿ Refer to Section 5.21 for details.
If you want to return all	•You can return all parameters which have been reset to their default settings.
reset parameters to their
	￿ Refer to Section 5.20 for details.
respective default settings

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