ABB RED615 Technical Manual page 620

Section 7
Condition monitoring functions
614
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 with a module diagram. All the modules in the diagram are explained in
the next sections.
A071111 V2 EN
Figure 338: 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
Rated Op current 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
Rated fault current setting, the possible operations are zero. The remaining life of
the tripping current in between these two values is calculated based on the trip
curve given by the manufacturer. The Op number rated and Op number fault
parameters set the number of operations the breaker can perform at the rated
current and at the rated fault current, respectively.
The remaining life is calculated separately for all three phases and it is available as
a monitored data value CB_LIFE_A (_B,_C). The values can be cleared by
setting the parameter CB wear values in the clear menu from WHMI or LHMI.
Clearing CB wear values also resets the operation counter.
Alarm limit check
When the remaining life of any phase drops below the Life alarm level threshold
setting, the corresponding circuit breaker life alarm CB_LIFE_ALM is activated.
It is possible to deactivate the CB_LIFE_ALM alarm signal by activating the
binary input BLOCK. The old circuit breaker operation counter value can be taken
into use by writing the value to the Initial CB Rmn life parameter and resetting the
value via the clear menu from WHMI or LHMI.
1YHT530004D05 D
615 series
Technical Manual