Toshiba VF-FS1 instruction manual How to determine the causes of other problems

E6581381

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	•	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.
	•	⇒ See section 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	•	The load is too heavy. Reduce the load.
speed does not change	•	The soft stall function is activated. Disable the soft stall function. ⇒ See section 5.12.
normally.	•	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 section 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 section 5.11 and 5.1.
The motor does not	•	The acceleration time (CEE) or the deceleration time (FGE) is set too short.
ac-celerate or decelerate		Increase the acceleration time (CEE) or the deceleration time (FGE).
smoothly.
A too large current flows	•	The load is too heavy. Reduce the load.
into the motor.	•	If the motor runs at a low speed, check whether the torque boost amount is too large. ⇒
		⇒ See section 5.11.
The motor runs at a higher	•	The motor has an improper voltage rating. Use a motor with a proper voltage rating.
or lower speed than the	•	The motor terminal voltage is too low.
specified one.		Check the setting of the base frequency voltage parameter (XNX) .
		⇒ See section 6.12.5.
	•	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 section 5.9.
The motor speed fluctu-ates	•	The load is too heavy or too light. Reduce the load fluctuation.
during operation.	•	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 RV is set at , check the vector control setting,
		operation conditions, etc. ⇒ See section 5.10.
Parameter settings cannot		Change the setting of the parameter H (prohibition of change of parameter
be changed.		setting) to  (permitted) if it is set at  (prohibited).
	*	For reasons of safety, some parameters cannot be reprogrammed while the inverter is
		running. ⇒ See section 4.2.6.
How to cope with parameter setting-related problems			13
If you forget parameters	•	You can search for all reset parameters and change their settings.
which have been reset		⇒ See section 4.2.3 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		⇒ See section 4.2.7 for details.
respective default settings

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