TROUBLESHOOTING
68
| MVE User Manual (710-17074-00G)
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Possible cause/Suggested solution
Instantaneous
overcurrent
There has been a sharp rise in motor current, probably caused by a locked rotor condition (shearpin)
while running. This may indicate a jammed load.
A trip may also occur when a medium level fault current has been detected. This may indicate a system
short circuit.
Related parameters: 4E, 4F, 16D
Instantaneous
overcurrent S2
There has been a sharp rise in output current, possibly caused by a short circuit condition. Identify and
resolve the cause of the fault.
Related parameters: 4U, 4V, 16D
Int Comms Fail
Communication has failed between the controller and the power interface board.
•
Check that the controller is receiving control voltage within the specified range (terminals A11,
A12).
•
Check that the fibre-optic cables between the controller and the interface board are firmly
connected.
•
Check that each fibre-optic cable is emitting light at the Rx end.
This trip is not adjustable.
Interlock Trip
This is a name selected for a programmable input. Refer to Input A trip.
Internal fault 94 ~
Internal fault 98
There has been an internal communication error within the soft starter. Remove then restore control
power.
This trip is not adjustable.
Internal fault 99 -
Internal fault 101
There is a problem with the non-conduction fibre-optic connections. Internal Fault 99 corresponds to
phase 1, Internal Fault 100 corresponds to phase 2, Internal Fault 101 corresponds to phase 3.
•
Check that the fibre-optic cable is properly connected between the non-conduction PCB on the
phase arm and the non-conduction readback connector on the power interface board.
•
If the problem persists, replace the fibre-optic cable.
This trip is not adjustable.
Internal fault 105
The power interface board is faulty or damaged. Replace the board.
This trip is not adjustable.
Internal fault 106
The selected configuration for the CT ratio selection switches on the power interface board is not valid.
•
Check the DIP switch settings on the interface PCB. Refer to
CT Current Measurement
.
This trip is not adjustable.
Internal fault 107
Mains voltage has been applied to the starter but no start signal has been received.
•
The starter will wait 5 seconds for a start signal, after mains voltage is applied.
•
The starter will wait 30 seconds after a stop signal, before checking for mains voltage.
This trip is not adjustable.
Internal fault X
The MVE has tripped on an internal fault. Contact your local supplier with the fault code (X).
Related parameters: None
L1 phase loss
L2 phase loss
L3 phase loss
During pre-start checks the starter has detected a phase loss as indicated.
In run state, the starter has detected that the current on the affected phase has dropped below 2% of the
starter's nominal FLC for more than 1 second, indicating that either the incoming phase or connection to
the motor has been lost.
Check the supply and the input and output connections at the starter and at the motor end.
Phase loss can also be caused by a failed SCR, particularly an SCR that has failed open circuit. A failed
SCR can only be definitely diagnosed by replacing the SCR and checking the starter's performance.
Related parameters: None
L1-T1 shorted
L2-T2 shorted
L3-T3 shorted
During prestart checks the starter has detected a shorted power assembly or a short within the bypass
contactor as indicated.
This trip is not adjustable.
Low Control Volts
Control voltage to the controller has dropped below the required level.
•
Check that supply voltage at the power interface board is 24 VAC/VDC (± 20 %).
This trip is not adjustable.
Low Level
This is a name selected for a programmable input. Refer to Input A trip.
