AuCom MVE Series User Manual page 47

PROGRAMMABLE PARAMETERS
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.
Instantaneous Overcurrent S2
Parameter 4U
Range: 30 A – 4400 A
Description: Sets the trip point for instantaneous overcurrent stage 2 protection in amperes. Set as required.
Instantaneous Overcurrent Delay S2
Parameter 4V
Range: 10 – 1000 ms
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
Overcurrent
(parameters 4E, 4F).
Example: Contactor and Fuse
1
2
11
3
4
Example: Circuit Breaker
1
1
2
10
3
4
46
| MVE User Manual (710-17074-00H)
8
9 9
5 6 7
Current
9
5 6 7
Current
Default: 4400 A
Default: 10 milliseconds
1 Instantaneous Overcurrent Delay -
Stage 1 (4F)
2 Motor start time
3 Instantaneous Overcurrent Delay -
Stage 2 (4V)
4 FLC
Motor start current
5
6 Instantaneous Overcurrent- Stage 1
(4E)
7 Instantaneous Overcurrent - Stage 2
(4U) to trip external upstream breaker
10
10
8 Fuse
9 SCR
10 Thermal model curve
Motor operation (shaded area of graph)
11
07248.F
1 Instantaneous Overcurrent Delay -
Stage 1 (4F)
2 Motor start time
3 Instantaneous Overcurrent Delay -
Stage 2 (4V)
4 FLC
Motor start time
5
6 Instantaneous Overcurrent -Stage 1
(4E)
7 Instantaneous Overcurrent -Stage 2
(4U) to trip main breaker
8 SCR
9 Thermal model curve
10 Motor operation (shaded area of graph)
8
07249.D
Instantaneous