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TROUBLESHOOTING
D
Display
PPossible cause/Suggested solution
Motor thermistor
The external resistance across the motor thermistor input (terminals B4, B5) has exceeded
2.4 k
ɏ
.
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
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.
Related parameters: 4G
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 MVS fuses and confirm that all three mains supply phases are present.
This trip is not adjustable.
Pump Fault
This is a name selected for a programmable input. Refer to Input A trip.
Starter
communication
(between module
and soft starter)
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.
Related parameters: 16J
Starter Disable
This is a name selected for a programmable input. Refer to Input A trip.
Undercurrent
The motor has experienced a sharp drop in current, caused by loss of load. Causes can
include broken components (shafts, belts or couplings), or a pump running dry.
Related parameters: 4C, 4D, 16C
Undervoltage
Mains voltage has fallen below the level selected in parameter 4Q. Causes can include an
undersized supply or adding a large load to the system.
Check that the starter is configured appropriately for local conditions.
Monitor the mains voltage to determine the cause of voltage fluctuation.
Related parameters: 4Q, 4R, 16V
Vibration
This is a name selected for a programmable input. Refer to Input A trip.
VZC Fail Px
Where 'X' is 1, 2 or 3.
The voltage detection system has failed.
The voltage dividing resistors have failed or the power interface board may be faulty.
Contact AuCom for advice.
710-13937-00C
MVS Panel User Manual
75
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