The values can be reset using the Clear menu on the LHMI or by activation the input RSTCBWR.
Alarm limit check
When the measured opening travel time is longer than the value set in the
tTrOpenAlm
setting, the
TRVTOPAL output is activated. Similarly, when the measured closing travel time is longer than the
value set in the
tTrCloseAlm
setting, the TRVTCLAL output is activated.
It is also possible to block the TRVTCLAL and TRVTOPAL alarm signals by activating the BLKALM
input.
16.4.7.2 Circuit breaker status
GUID-390A1250-B258-4023-9A7D-0D7E19E13A6C v11
The circuit breaker status subfunction monitors the position of the circuit breaker, that is,
whether the breaker is in the open, closed or error position. The operation is described in Figure
547.
Phase current
check
Contact
position
indicator
POSCLOSE
POSOPEN
I3P-ILRMSPH
OPENPOS
CLOSEPOS
INVDPOS
IEC12000613-3-en.vsd
IEC12000613 V3 EN-US
Figure 547: Functional module diagram for monitoring circuit breaker status
Phase current check
The module compares the phase current I3P-ILRMSPH to the
AccStopCurr
setting. If the current in
the selected phase exceeds the set level, it is reported to the contact position indicator module as
closed circuit breaker.
Contact position indicator
The circuit breaker status is open when the auxiliary input contact POSCLOSE is low, the POSOPEN
input is high and the phase current is less than the setting
AccStopCurr
value. The circuit breaker
is closed when the POSOPEN input is low and the POSCLOSE input is high. The breaker is in the error
state if both auxiliary contacts have the same value or if the auxiliary input contact POSCLOSE is
low and the POSOPEN input is high but the current is above the setting
AccStopCurr
.
The status of the breaker is indicated with the binary outputs OPENPOS, CLOSEPOS and INVDPOS
for open, closed and error position respectively.
16.4.7.3 Remaining life of circuit breaker
GUID-C347406A-2B6F-42BD-B70B-51489AB51EAE v11
The Remaining life of circuit breaker subfunction is used to give an indication on the wear and tear
of the circuit breaker. Every time the breaker operates, the life of the circuit breaker reduces due
to wear. The breaker wear depends on the interrupted current. The remaining life of the breaker is
estimated from the circuit breaker trip curve provided by the manufacturer. The remaining life is
Section 16 1MRK 502 066-UUS B
Monitoring
1054
Technical manual
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