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Section 12
Monitoring
12.17.7.5
408
GUID-FF1221A4-6160-4F92-9E7F-A412875B69E1 V1 EN
Figure 175:
Functional module diagram for counting circuit breaker operations
Operation counter
The operation counter counts the number of operations based on the state change of
the binary auxiliary contacts inputs POSCLOSE and POSOPEN.
The number of operations NO_OPR is available through the Monitored data view on
the LHMI or through tools via communications. The old circuit breaker operation
counter value can be taken into use by writing the value to the CountInitVal parameter
and can be reset by Clear CB wear in the clear menu from LHMI.
Alarm limit check
The OPRALM operation alarm is generated when the number of operations exceeds the
value set with the OpNumAlm threshold setting. However, if the number of operations
increases further and exceeds the limit value set with the OpNumLO setting, the
OPRLOALM output is activated.
The binary outputs OPRLOALM and OPRALM are deactivated when the BLOCK input
is activated.
y
Accumulation of I
t
y
Accumulation of the I
t module calculates the accumulated energy.
The operation of the module can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
1MRK 505 288-UEN A
Technical manual
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