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TROUBLESHOOTING
Page 56 MVS User Manual 710-13019-00A
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.
Motor connection There is a problem with the soft starter's connection to the motor. If only one phase is affected,
the error message will indicate which phase (T1, T2, T3).

Ensure the motor is connected to terminals T1, T2, T3 using in-line (three wire) connection.
The MVS does not support inside delta (six wire) connection.

Check that the fibre-optic cables between the power interface PCB and the gate drive
adaptor PCBs are firmly connected.

Check each output phase of the soft starter for power circuit continuity.
This trip will also occur when there is a phase imbalance across the soft starter’s input terminals L1,
L2, L3.
Related parameters: None
Motor overload
(thermal model)
The motor has reached its maximum thermal capacity. Overload can be caused by:

The soft starter protection settings not matching the motor thermal capacity

Excessive starts per hour

Excessive throughput

Damage to the motor windings
Resolve the cause of the overload and allow the motor to cool.
If you think the soft starter has tripped incorrectly, check the parameter settings.
Related parameters: 1A, 1B, 1C, 1D, 9B, 16A
Motor thermistor
The external resistance across the motor thermistor input (terminals B4, B5) has exceeded 2.4 k Ω .

If the starter tripped at power-up, no thermistor is present at terminals B4, B5. If you are not
using a thermistor, you must attach a link across terminals B4-B5.

If the starter tripped during operation, the temperature of the motor winding has increased.
Resolve the cause of the overheating.
Related parameters: 16I
Network
communication
(between module
and network)
The network master has sent a trip command to the starter, or there may be a network
communication problem.
Check the network for causes of communication inactivity.
Related parameters: 16K
Overvoltage There has been a voltage surge on the mains. Causes can include problems with a transformer
tap regulator or off-loading of a large transformer load.

Check that the starter is configured appropriately for local conditions.

Monitor the mains voltage to determine the cause of the voltage fluctuation, and resolve the
cause.
Related parameters: 4S, 4T, 16W
Parameter out of
Range

An error occurred loading data from the EEPROM to RAM when the Controller powered up.

The parameter set or values in the Controller do not match the parameters in the starter.

"Load User Set" has been selected but no saved file is available.
Reset the fault and then reload the default settings. If the problem persists, contact your local
distributor.
Related parameters: None
Phase sequence The phase sequence on the soft starter's input terminals (L1, L2, L3) is not valid.
Check the phase sequence on L1, L2, L3 and ensure the setting in parameter 4G is suitable for the
installation.
Related parameters: 4G
Power loss The starter is not receiving mains supply on one or more phases when a Start Command is given.

Check that the main contactor closes when a start command is given, and remains closed until
the end of a soft stop.

Check MVS fuses and confirm that all three mains supply phases are present.
This trip is not adjustable.
Starter
communication
(between module
There could be a problem with the connection between the soft starter and the optional
communications module. Remove and reinstall the module. If the problem persists, contact
your local distributor.
The communications module has been powered down while the soft starter remains powered up.