ABB RER615 - Page 557

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 284: 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.
Figure 285: Functional module diagram for calculating accumulative energy and
alarm
Accumulated energy calculator
This module calculates the accumulated energy I
y
t [(kA)
y
s]. The factor y is set with
the Current exponent setting.
1MRS758755 C
Condition monitoring functions
REC615 & RER615
Technical Manual
557