TROUBLESHOOTING
MVE User Manual (710-17074-00G) | 69
Possible cause/Suggested solution
Low Pressure
This is a name selected for a programmable input. Refer to Input A trip.
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
MVE does not support inside delta (six wire) connection.
• Check that the fibre-optic cables between the power interface board and the MVE 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, during starting and stopping.
Related parameters: None
Motor Connection
Tx
Where 'X' is 1, 2 or 3.
The motor is not connected correctly to the soft starter.
• Check individual motor connections to the soft starter for power circuit continuity.
Check connections at the motor terminal box.
This trip is not adjustable.
Related parameters: None
Motor overload
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 or start duration
• Excessive current
• Damage to the motor windings
Resolve the cause of the overload and allow the motor to cool.
Related parameters: 1A, 1B, 1C, 1D, 9B, 16A
Motor Prot
This is a name selected for a programmable input. Refer to Input A trip.
Motor Temp
This is a name selected for a programmable input. Refer to Input A trip.
Motor thermistor
The external resistance across the motor thermistor input (terminals B4, B5) has exceeded 2.4 kΩ.
• 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 device
and network)
There is a network communication problem, or the network master may have sent a trip command to
the starter. Check the network for causes of communication inactivity.
No Flow
This is a name selected for a programmable input. Refer to Input A trip.
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
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.
PLC
This is a name selected for a programmable input. Refer to Input A trip.
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 MVE fuses and confirm that all three mains supply phases are present.
This trip is not adjustable.
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