How To Check Other Troubles - Toshiba TOSVERT VF-AS1 Instruction Manual

13.4

How to check other troubles

The following table provides a listing of other troubles, their possible causes and remedies.
The motor runs in the wrong
direction.
The motor runs but its
speed does not change
normally.
The motor does not
accelerate or decelerate
smoothly.
A too large current flows
into the motor.
The motor runs at a higher
or lower speed than the
specified one.
The motor speed varies
during operation.
Some or all of six keys on
operation panel don't work.
Access to parameter results
in failure.
Parameter settings cannot
be changed.
Monitor (Display) is
uncontrollable.
13
How to cope with parameter setting-related problems
If you forget parameters
which have been reset
If you want to return all
reset parameters to their
respective default settings
Troubles
•Invert the phases of the output terminals U, V and W.
•Invert the forward/reverse run signal terminals of the external input device.
⇒ Refer to Section 7.2, Assignment of functions to control terminals.
•The load is too heavy.
• Reduce the load.
•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 acceleration time () or the deceleration time () is set too short.
Increase the acceleration time () or the deceleration time ().
•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.
⇒ Refer to Section 5.7.
•The motor has 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 ().
⇒ 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 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  or larger (5 and 6 are removed.),
check the vector control setting, operation conditions, etc. ⇒ Refer to Section 5.6.
•Change panel operation prohibition parameter ~.
* Parameter is occasionally set for key operation prohibition mode. Cancel key
operation prohibition mode according to the following procedure.
To cancel the setting, press and hold down the ENT key for 3 seconds or more.
(1)If parameter write protect selection parameter  is set at  (prohibited),
change the setting to  (allowed).
(2)If there is an input terminal that is set for  (or ) (parameter editing
enabling ) by input terminal function parameter, turn on the terminal.
•You can search for all reset parameters and change their settings.
⇒ Refer to Section 5.21 for details.
•You can return all parameters which have been reset to their default settings.
⇒ Refer to Section 5.20 for details.
Causes and remedies
M-8
E6581301