7.1.4.4
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 491: 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.
7.1.4.5
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.
Condition monitoring functions
1MRS757644 H
914
620 series
Technical Manual
