ABB REB650, Technical Manual

Page: 335 / 504

can be reset by setting the Clear accum. breaking curr setting to true in the clear menu
from LHMI.
Alarm limit check
The
IACCALM
alarm is activated when the accumulated energy exceeds the value set
with the AccCurrAlmLvl threshold setting. However, when the energy exceeds the limit
value set with the AccCurrLO threshold setting, the
IACCLOAL
output is activated.
The
IACCALM
and
IACCLOAL
outputs can be blocked by activating the binary input
BLOCK
.
12.17.7.6 Remaining life of the circuit breaker
Every time the breaker operates, the life of the circuit breaker reduces due to wearing.
The wearing in the breaker depends on the tripping current, and the remaining life of
the breaker is estimated from the circuit breaker trip curve provided by the
manufacturer. The remaining life is decremented at least with one when the circuit
breaker is opened.
The operation of the remaining life of the circuit breaker subfunction can be described
by using a module diagram. All the modules in the diagram are explained in the next
sections.
CB life
estimator
POSCLOSE
CBCNTRST
BLOCK
Alarm limit
check
CBLIFEAL
BLK_ALM
I3P
I_A
I_B
I_C
GUID-1565CD41-3ABF-4DE7-AF68-51623380DF29-ANSI V1 EN
Figure 135: Functional module diagram for estimating the life of the circuit breaker
Circuit breaker life estimator
The circuit breaker life estimator module calculates the remaining life of the circuit
breaker. If the tripping current is less than the rated operating current set with the
RatedOpCurr setting, the remaining operation of the breaker reduces by one operation.
If the tripping current is more than the rated fault current set with the RatedFaultCurr
setting, the possible operations are zero. The remaining life due to the tripping current
in between these two values is calculated based on the trip curve given by the
manufacturer. The
OpNumRatCurr and OPNumFaultCurr parameters set the number
1MRK 505 277-UUS C
Section 12
Monitoring
329
Technical Manual