ABB RELION 620 Series Technical Manual page 923

1MRS757644 F
7.1.4.5
620 series
Technical Manual
The operation of the subfunction can be described with a module diagram. All the
modules in the diagram are explained in the next sections.
A071108 V2 EN
Figure 481: 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 in 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 Counter initial Val parameter
and by setting the parameter Initial CB Rmn life in the clear menu from WHMI or
LHMI.
Alarm limit check
The OPR_ALM operation alarm is generated when the number of operations exceeds
the value set with the Alarm Op number threshold setting. However, if the number of
operations increases further and exceeds the limit value set with the Lockout Op
number setting, the OPR_LO output is activated.
The binary outputs OPR_LO and OPR_ALM 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 with a module diagram. All the modules
in the diagram are explained in the next sections.
Condition monitoring functions
Section 7
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