Mitsubishi Electric MEsoftstart/I01 Users, Installation & Instruction Manual page 59

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ii.
Make the 'Start Current' higher.
iii.
Make the 'Start%' higher.
iv.
If none of these actions resolve the problem, check the motor nameplate for the full load current specification of the
motor and re-check the soft starter continuous current rating as well as the maximum starting current for the
MEsoftstart soft starter and contact your distributor for advice.
Motor overload
This error is related to the Motor protection class. The default protection class is 10. If this causes an error, confirm that the
motor and wiring is correct and check with the motor manufacturer if the protection class may be changed to 20 or 30 using the
PC Application.
Over current (running)
i.
Check the wiring to the motor.
ii.
Check that the motor temperature is not too high.
iii.
Confirm that there is no overload on the motor.
Supply voltage and current imbalance
i.
The default permitted supply voltage imbalance amongst phases is 20% (refer paragraph 5.2.1). Measure the imbalance
and if below 25%, use the MEsoftstart PC app to change the imbalance percentage to 25% if the motor specification
permits that. If more than 20%, contact your plant electrician to check and try to balance phase loading for the plant.
ii.
The default phase current imbalance is 10% (refer paragraph 5.2.1). This can be set to 20% maximum using the
MEsoftstart PC application if the motor specification permits it.
Switching element
This error indicates a hardware fault inside the soft starter. Contact your distributor.
Internal temperature high
This error occurs when the temperature inside the soft starter is too high. The soft starter will trip and only allow a restart again
when the soft starter has cooled down to room temperature.
i.
The error may occur because of overuse of the JOG function.
ii.
A long start-up ramp time on a motor with heavy load will also cause a temperature trip. Configuring the soft starter
for Heavy Duty (refer paragraph 5.3 above) for a lower limit during the start ramp, may cure the problem. Re-confirm
the motor size and starting current for Heavy Duty in
iii.
Table 1 or Table 2 above.
iv.
If there is no overuse or abnormal load or environmental conditions that may contribute to this issue and the soft starter
repeatedly trips on this error, please contact your distributor for advice.
59 Basic operation – Core models

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