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.
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 SSCBR1 rem.life in the Clear menu from 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.