How To Determine Causes Of Other Problems - Toshiba TOSVERT VF-AS3 Instruction Manual

13. 3 How to determine causes of other
problems
The following table provides a listing of other problems, their possible causes and measures.
Problems
- The phase sequence of the output termi-
nals [U/T1], [V/T2] and [W/T3] is wrong.
The motor runs
- The Fwd/Rev run signals are input
in the wrong
inversely in terminal run.
direction.
- The setting of <Fr: Panel Fwd/Rev run
select> is incorrect in panel run.
- The load is large.
- The overload stall function is activated.
- <FH: Maximum frequency> and <UL:
Upper limit frequency> are set too low.
The motor runs
but its frequency
does not
change.
- The value of analog signal in the frequency
command is small.
- If the motor runs at a low speed, the torque
boost value is too large.
The motor does
not accelerate - <ACC: Acceleration time 1> or <dEC:
or decelerate Deceleration time 1> is set too short.
smoothly.
- The load is large.
A too large cur-
rent flows into
- If the motor runs at a low speed, the torque
the motor.
boost value is too large.
- The motor has an improper voltage rating.
- The motor terminal voltage is too low.
The motor runs
at a higher or
- The reduction gear ratio, etc., are not set
lower speed
properly.
than the speci-
fied one.
- The frequency command is not set cor-
rectly.
Causes
13-15
Measures
- Invert the phases of the output terminals
[U/T1], [V/T2] and [W/T3].
- Invert the Fwd/Rev run signal terminals of
the external input device. (Refer to [7. 2])
- Change <Fr> setting.
- Reduce the load.
- Disable the overload stall function OFF in
<OLM: Motor overload protection character-
istic>, and reduce the load (Refer to [5. 1.
5]).
- Increase the setting values of these param-
eters.
- Check the value of the signal, circuit, wir-
ing, etc.
- Check the characteristics (point 1 and point
2 setting) of the analog signal. (Refer to [7.
3])
- Check if an overcurrent alarm or overload
alarm has occurred and adjust <vb: Manual
torque boost 1> and <ACC: Acceleration
time 1>. (Refer to [5. 2. 6] and [5. 1. 4])
- Increase the value of each parameter.
- Reduce the load.
- Check if the value of <vb: Manual torque
boost 1> is too large. (Refer to [5. 2. 6])
- Use a motor with a proper voltage rating.
- Check the setting value of <vLv: Base fre-
quency voltage 1>. (Refer to [5. 1. 2])
- Change the wire size to large.
- Adjust the reduction gear ratio, etc.
- Check the value and range of the fre-
quency command.
- Adjust <vL: Base frequency 1> to the
motor. (Refer to [5. 1. 2])
13. Trip information and measures
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