TROUBLESHOOTING
66 | MVE User Manual (710-17074-00G)
9. Troubleshooting
The MVE provides extensive information to help the operator diagnose and remedy any operating difficulties.
In addition to the motor and load protection features already described, the MVE reports in detail on the starter's own state. Any
internal failure will cause the soft starter to trip, and full details will be recorded in the Trip Log and Event Log.
9.1 Protection Responses
When a protection condition is detected, the MVE will write this to the event log and may also trip or issue a warning. The soft
starter's response depends on the Protection Action setting (parameter group 16).
Some protection responses cannot be adjusted by the user. These trips are usually caused by external events (such as phase loss)
or by a fault within the soft starter. These trips do not have associated parameters and cannot be set to Warn or Log.
If the MVE trips you will need to identify and clear the condition that triggered the trip, then reset the soft starter before restarting.
To reset the starter, press the
button on the controller or activate the Reset remote input.
If the MVE has issued a warning, the soft starter will reset itself once the cause of the warning has been resolved.
Summary of soft starter responses to protection events
Protection response
setting
Trip relay output
(parameter 7A, 7D, 7G =
'Trip')
Trip Starter On Yes Yes Yes
Warn and Log Flashing No Yes No
Log Only Off No Yes No
9.2 Trip Messages
This table lists soft starter's protection mechanisms and the probable cause of the trip. Some of these can be adjusted using
parameter group 4 Protection Settings and parameter group 16 Protection Action, other settings are built-in system protections
and cannot be set or adjusted.
Possible cause/Suggested solution
Battery/clock
A verification error has occurred on the real time clock, or the backup battery voltage is low. If the
battery is low and the power is off, date/time settings will be lost. The MVE will continue to soft start and
soft stop correctly. Reprogram the date and time.
The battery is not removable. In order to replace the battery, the main control PCB must be replaced.
Related parameters: 16M
Bypass fail (bypass
contactor)
The bypass contactor has welded closed or is not operating correctly. There may be a problem with the
control circuit or the contactor coil.
Check the condition of the bypass contactor's main poles. Check the operation of the contactor control
circuitry and contactor coil.
This trip is not adjustable.
You can use the Run Simulation to check the bypass contactor's operation without mains
voltage connected.
Controller
This is a name selected for a programmable input. Refer to Input A trip.
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