7.1.5.4 Operation counter
The operation counter subfunction calculates the number of breaker operation
cycles. The opening and closing operations are both included in one operation cycle.
The operation counter value is updated after each opening operation.
The operation of the subfunction can be described with a module diagram. All the
modules in the diagram are explained in the next sections.
Figure 777: 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
CB wear values
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.
7.1.5.5 Accumulation of I y t
Accumulation of the I
y
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.
1MRS759142 F
Condition monitoring functions
REX640
Technical Manual
1365
To Next Page
Loading...
