Figure 2-3 Mcb Opening Timing Diagram - ABB ACS1000i User Manual

Typical maximum values for the drive are defined as follows:
– Maximum protection trip time: 120 ms
The maximum protection trip time is the maximum allowed breaking time (open and
arcing) of the breaking device after the open command has been initiated to prevent
further damage to the drive, such as diode failures.
– Maximum safety trip time: 250 ms
The maximum safety trip time is the maximum allowed time to ensure safe
disconnection of the main power supply to prevent any hazard to personnel.
1
2
Figure 2–3 MCB opening timing diagram
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
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.
PRODUCT
ACS1000i
3
5
6
DOCUMENT KIND
User manual
IMPORTANT SAFETY INFORMATION
4
DOCUMENT ID.
3BHS206977 E01
REV. LANG. PAGE
J en 19/146