14.18.7.4 Operation counterThe operation counter subfunction calculates the number of breaker operation cycles.Both open and close operations are included in one operation cycle. The operation countervalue is updated after each open operation.The operation of the subfunction can be described by using a module diagram. All themodules in the diagram are explained in the next sections.GUID-FF1221A4-6160-4F92-9E7F-A412875B69E1 V1 ENFigure 317: Functional module diagram for counting circuit breaker operationsOperation counterThe operation counter counts the number of operations based on the state change of thebinary auxiliary contacts inputs POSCLOSE and POSOPEN.The number of operations NO_OPR is available through the Monitored data view on theLHMI or through tools via communications. The old circuit breaker operation countervalue can be taken into use by writing the value to the CountInitVal parameter and can bereset by Clear CB wear in the clear menu from LHMI.Alarm limit checkThe OPRALM operation alarm is generated when the number of operations exceeds thevalue set with the OpNumAlm threshold setting. However, if the number of operationsincreases further and exceeds the limit value set with the OpNumLO setting, theOPRLOALM output is activated.The binary outputs OPRLOALM and OPRALM are deactivated when the BLOCK input isactivated.14.18.7.5 Accumulation of IytAccumulation of the Iyt module calculates the accumulated energy.The operation of the module can be described by using a module diagram. All the modulesin the diagram are explained in the next sections.1MRK 506 335-UUS A Section 14Monitoring689Technical manual
