IMPORTANT SAFETY INFORMATION
PRODUCT
ACS6000
DOCUMENT KIND
User manual
DOCUMENT ID.
3BHS212794 E01
REV.
N
LANG.
en
PAGE
39/266
Figure 2-3 MCB opening timing diagram
In order to meet the stipulated safety requirements, ABB recommends one of the
following:
– MCB is equipped with 2 independent opening coils
– MCB is equipped with an opening coil and an undervoltage coil for monitoring
of the control voltage
– Upstream protection coordination scheme is provided which uses the "breaker
failure" (ANSI 50BF) signal to automatically trip the upstream breaker, in case
the MCB does not open.
IMPORTANT! The upstream breaker must open within the maximum safety trip
time after a failure has occurred.
2.8. Maintenance recommendation
The MCB trip circuits should be checked annually.
1) Short-circuit occurs
2) Open and or trip command is set at the drive control output
3) No further damage to the drive
4) No hazard to personnel
5) Maximum protection trip time
6) Maximum safety trip time
1
3
5
4
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