DOCA0219EN-00

Operation Counter and Contact Wear Indicator

Operation Counter

This function is available only via the COM communications option.

MicroLogic P trip unit:

  • Stores and displays the total number of operations (incremented each time the circuit breaker opens) since the initial installation of the circuit breaker.

  • Stores and displays the total number of operations since the last reset.

Contact Wear Indication

This function can be used to:

  • Determine the condition of the most worn contact in the circuit breaker. A counter is displayed on the screen. The contacts must be inspected each time the counter reaches a hundred mark. The message Not available or circuit breaker type not defined is displayed if the type of circuit breaker has not been defined. In this case, see Breaker selection in the MicroLogic setup menu under History, maintenance and setup.

  • Reset the indicator after changing the main contacts. Reset is also carried out via Breaker selection in the MicroLogic setup menu.

NOTE: If the trip unit is changed, the circuit breaker must be defined again. In this case, see Breaker selection in the MicroLogic setup menu under History, maintenance and setup.
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