3BHS212794 E01 REV M ACS6000 USER MANUAL 49/278
02 IMPORTANT SAFETY INFORMATION
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
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