PROGRAMMING MENU
Page 28
MVS User Manual
710-13019-00A
Description:
Sets the time for the soft starter to auto-stop, in 24 hour clock format.
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 (parameter group 16). The default response is a trip.
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.
4A, 4B – 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)
Default: 20 seconds
Description:
Parameter 4A sets the time for the primary motor and parameter 4B (
Excess Start Time-2
)
sets the time for the secondary motor.
4C, 4D – Undercurrent
The MVS can be configured to trip if the average current of all three phases drops below a specified level while
the motor is running.
Parameter 4C
Undercurrent
Range:
0% - 100%
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.
Parameter 4D
Undercurrent Delay
Range:
0:00 - 4:00 (minutes:seconds)
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.
Parameter 4E
Instantaneous Overcurrent
Range:
80% - 600% FLC
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)
Default: 0 seconds
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
Range:
Any sequence (Default)
Positive only
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.
