Toshiba VF-nC1 User Manual download pdf (Page 136)

E6581090

M-8

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 wron

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 6.2 "Assignment of functions to control terminals".)

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 5.10.)

• 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 6.4.)

• 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.

ust the torque boost amount

(

)

and the acceleration time

(

CEE

)

(See 5.1.)

The motor does not

accelerate or

decelerate smoothl

• 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 5.9.)

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 (H).

(See 6.12.)

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 5.8.)

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.

Parameter settings

cannot be chan

ed.

Change the setting of the parameter H (prohibition of change of

parameter setting) to .. (permitted) if it is set at ...

(prohibited).

*For safety’s sake, some parameters cannot be set during operation.

(See 4.1.4.)

How to cope with parameter setting-related problems

If you forget

parameters which

have been reset

Yo u c a n sea r c h f o r all reset parameters and change their settings.

*Refer to 4.1.3 for details.

If you want to return

all reset parameters

to their respective

default settings

Yo u c a n r e t u r n a l l parameters which have been reset to their default

settings.

*Refer to 4.1.5 for details.

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Toshiba VF-nC1 User Manual Page 136

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