Maintenance Recommendation; Figure 2-3 Mcb Opening Timing Diagram - ABB PCS6000 User Manual

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2
Figure 2–3 MCB opening timing diagram
1) Short-circuit occurs
2) Open and or trip command is set at the converter control output
3) No further damage to the converter
4) No hazard to personnel
5) Maximum protection trip time
6) Maximum safety trip time
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.
PRODUCT
PCS6000
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5
DOCUMENT KIND
User manual
IMPORTANT SAFETY INFORMATION
6
DOCUMENT ID.
3BHS600000 E40
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REV. LANG. PAGE
G en 28/114