CONFIGURATION
44Q Undervoltage Level
Range:
100 – 18000 V
D
Default:
100 V
Description:
Sets the trip point for undervoltage protection. Set as required.
4R Undervoltage Trip Delay
Range:
0:00 – 4:00 (minutes:seconds)
D
Default:
5 seconds
Description:
Slows the MVS's response to undervoltage, avoiding trips due to momentary
fluctuations.
4S Overvoltage Level
Range:
100 – 18000 V
D
Default:
7200 V
Description:
Sets the trip point for overvoltage protection. Set as required.
4T Overvoltage Trip Delay
Range:
0:00 – 4:00 (minutes:seconds)
D
Default:
5 seconds
Description:
Slows the MVS's response to overvoltage, avoiding trips due to momentary fluctuations.
4U, 4V – Instantaneous Overcurrent Stage 2
The MVS has two instantaneous trip functions, stage 1 and 2. These protection functions are configured to be
complementary.
Stage 1 must be configured to protect the motor against a locked rotor (shearpin) situation during run mode.
Stage 1 should trigger at lower current/higher time values than Stage 2.
Stage 2 must be configured to protect the main switching device. When Stage 2 triggers, the starter opens the
main switching device.
If the main switching element is a contactor (protected by a fuse), then this function must be coordinated with the
fuse to ensure that the contactor does NOT open until the fuse ruptures.
If the main switching element is a breaker, then the delay must be minimised to provide the best possible protection
to the SCR.
Parameter 4U
Instantaneous Overcurrent S2
Range:
30 A – 4400 A
D
Default:
4400 A
Description:
Sets the trip point for instantaneous overcurrent stage 2 protection in amperes. Set as
required.
Parameter 4V
Instantaneous Overcurrent Delay S2
Range:
10 – 1000 ms
D
Default:
10 milliseconds
Description:
Sets the duration required for current to exceed the level set in parameter 4U before a
trip occurs. Set as required.
NOTE
This protection is active during starting, running and stopping. It must be coordinated with
Instantaneous
Overcurrent (parameters 4E, 4F).
Example: Contactor and Fuse
Ti
me
1
3
6
7
5
8
4
2
9
10
07248.E
1
Instantaneous Overcurrent Delay -
Stage 1 (4F)
2
Motor start time
3
Instantaneous Overcurrent Delay -
Stage 2 (4V)
4
FLC
5
Motor start current
6
Instantaneous Overcurrent- Stage 1
(4E)
7
Instantaneous Overcurrent - Stage 2
(4U) to trip external upstream breaker
8
Fuse
9
SCR
10
Thermal model curve
Current
Shaded area indicates motor operation
710-13937-00C
MVS Panel User Manual
47
Содержание MVSxxxx-V02
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