CONFIGURATION
4 Protection Settings
These parameters determine when the soft starter's protection mechanisms will activate. The activation point for
each protection mechanism can be set to suit the installation.
The soft starter responds to protection events by tripping, warning, or writing the event to the event log. The
response is determined by the Protection Action settings. The default response is a trip.
C
CAUTION
The protection settings are vital for safe operation of the soft starter and motor. Defeating the
protection may compromise the installation and should only be done in the case of emergency.
44A – Excess Start Time
Excess start time is the maximum time the MVS will attempt to start the motor. If the motor does not
transition to Run mode within the programmed limit, the starter will trip. Set for a period slightly longer
than required for a normal healthy start. A setting of 0 disables excess start time protection.
Range:
0:00 - 4:00 (minutes:seconds)
D
Default:
20 seconds
Description:
Set as required.
4B – Excess Start Time-2
Range:
0:00 - 4:00 (minutes:seconds)
D
Default:
20 seconds
Description:
Set as required.
4C – Undercurrent
Range:
0% - 100%
D
Default:
20%
Description:
Sets the trip point for undercurrent protection, as a percentage of motor full load
current. Set to a level between the motor's normal working range and the motor's
magnetising (no load) current (typically 25% to 35% of full load current). A setting of
0% disables undercurrent protection.
4D – Undercurrent Delay
Range:
0:00 - 4:00 (minutes:seconds)
D
Default:
5 seconds
Description:
Slows the MVS's response to undercurrent, avoiding trips due to momentary
fluctuations.
4E, 4F – Instantaneous Overcurrent
The MVS can be configured to trip if the average current of all three phases exceeds a specified level while
the motor is running. Refer to
4U, 4V – Instantaneous Overcurrent Stage 2 on page 47 for more
information and examples.
Parameter 4E
Instantaneous Overcurrent
Range:
80% - 600% FLC
D
Default:
400%
Description:
Sets the trip point for instantaneous overcurrent protection, as a percentage of motor
full load current.
Parameter 4F
Instantaneous Overcurrent Delay
Range:
0:00 - 1:00 (minutes:seconds)
D
Default:
0 second
Description:
Slows the MVS's response to overcurrent, avoiding trips due to momentary overcurrent
events.
NOTE
This protection is only active during run and must be coordinated with
Instantaneous Overcurrent
Stage 2 (parameters 4U, 4V).
4G – Phase Sequence
Options:
Any Sequence
Positive Only (default)
Negative Only
Description:
Selects which phase sequences the soft starter will allow at a start. During its pre-start
checks, the starter examines the sequence of the phases at its input terminals and trips if
the actual sequence does not match the selected option.
710-13937-00C
MVS Panel User Manual
45
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