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

13. 4 How to determine causes of other
The following table provides a listing of other problems, their possible causes and measures.
Problems
The motor runs
in the wrong
direction.
4
4
The motor runs
but its frequency
does not
change.
8
9
The motor does
not accelerate
or decelerate
smoothly.
A too large
current flows
13
into the motor.
The motor runs
at a higher or
lower speed
than the
specified one.
13. Trip information and measures
problems
Causes
- The phase sequence of the output
terminals [U/T1], [V/T2] and [W/T3] is wrong.
- The Fwd/Rev run signals are input
inversely in terminal run.
- 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 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.
- <ACC: Acceleration time 1> or <dEC:
Deceleration time 1> is set too short.
- The load is large.
- If the motor runs at a low speed, the torque
boost value is too large.
- The motor has an improper voltage rating.
- The motor terminal voltage is too low.
- The reduction gear ratio, etc., are not set
properly.
- The frequency command is not set
correctly.
- 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
characteristic>, and reduce the load (Refer
to [5. 2. 5]).
- Increase the setting values of these
parameters.
- Check the value of the signal, circuit,
wiring, 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. 3. 6] and [5. 2. 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. 3. 6])
- Use a motor with a proper voltage rating.
- Check the setting value of <vLv: Base
frequency voltage 1>. (Refer to [5. 2. 2])
- Change the wire size to large.
- Adjust the reduction gear ratio, etc.
- Check the value and range of the
frequency command.
- Adjust <vL: Base frequency 1> to the
motor. (Refer to [5. 2. 2])
13-16
E6582062
Measures