TROUBLESHOOTING
SSymptom
PProbable Cause
Erratic motor operation.
The SCRs in the MVS require at least 5 A of current to latch. If you are
testing the soft starter on a motor with full load current less than 5 A, the
SCRs may not latch correctly.
Soft stop ends too quickly.
The soft stop settings may not be appropriate for the motor and load.
Review the settings of parameters 2H, 2I, 10H and 10I.
If the motor is very lightly loaded, soft stop will have limited effect.
Remote start/stop command is
overriding Auto-Stop settings when
using remote two-wire control.
Auto-Stop should only be used in remote mode with three-wire or
four-wire control.
Parameter settings cannot be stored.
Make sure you are saving the new value by pressing the SSTORE button
after adjusting a parameter setting. If you press EEXIT, the change will not
be saved.
Check that the adjustment lock (parameter 15B) is set to
Read & Write.
If the adjustment lock is set to
Read Only, settings can be viewed but not
changed. You need to know the security access code to change the
adjustment lock setting.
The EEPROM may be faulty on the controller. A faulty EEPROM will also
trip the soft starter, and the controller will display the message Parameter
Out Of Range. Contact your local supplier for advice.
ATTENTION! Remove Mains Volts
The soft starter will not activate Run Simulation with three-phase power
connected. This prevents unintentional direct on-line (DOL) start.
Current values shown on the display
are incorrect.
Check that the setting of the CT ratio selector DIP switch on the power
interface board matches the ratio of the CT used. Refer to
Ground
Current.
710-13937-00C
MVS Panel User Manual
77
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