CONTROLLER
50
| MVE User Manual (710-17074-00G)
4O – Ground Fault Level
Range:
1 A - 40 A
Default:
1 A
Description:
Sets the trip point for ground fault protection. Ground fault is a dynamic trip based on phase current
measurements every half-cycle.
4P – Ground Fault Delay
Range:
0:01 - 4:00 (minutes:seconds)
Default:
3 seconds
Description:
Slows the MVE's response to ground fault variation, avoiding trips due to momentary fluctuations.
NOTE
Ground fault accuracy is within ± 1 A of the set value.
4Q – Undervoltage Level
Range:
100 – 18000 V
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)
Default:
5 seconds
Description:
Slows the MVE's response to undervoltage, avoiding trips due to momentary fluctuations.
4S – Overvoltage Level
Range:
100 – 18000 V
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)
Default:
5 seconds
Description:
Slows the MVE's response to overvoltage, avoiding trips due to momentary fluctuations.
4U, 4V – Instantaneous Overcurrent Stage 2
The MVE 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
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
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).
