GE Industrial Solutions Entellisys 4.0 System User Manual - Manual (Page 194)

Preventive maintenance 194
12
12.1.1 Total operations
Entellisys keeps a count of the total number of transitions of each EntelliGuard circuit breaker.
When an EntelliGuard circuit breaker transitions from the closed state to the open state,
regardless of load, this counter is incremented by 1 count.
12.1.2 Total no-load operations
Entellisys keeps a count of the total number of transitions that occur with no-load on each
EntelliGuard circuit breaker. When a circuit breaker transitions from closed to open, if during the
transition there is less than 1% of the rated current flowing through the circuit breaker, this
counter is incremented by 1 count.
12.1.3 Total load operations
Entellisys keeps a count of the total number of transitions that occur with load on each
EntelliGuard circuit breaker. When an EntelliGuard circuit breaker transitions from closed to
open, if during the transition there is greater than or equal to 1% of the rated current flowing
through the circuit breaker, this counter is incremented by 1 count.
12.1.4 Total fault operations
Entellisys keeps a count of the total number of transitions that occur due to a fault on each
EntelliGuard circuit breaker. When an EntelliGuard circuit breaker transitions from closed to
open as a result of a protection feature issuing a trip (i.e., Short time trip, Long time trip,
Instantaneous over-current etc.), this counter is incremented by 1 count.
12.1.5 Percent load life
Entellisys keeps track of the percentage of the total load life used of each EntelliGuard circuit
breaker. When an EntelliGuard circuit breaker transitions from closed to open, the percentage
load life used is updated and stored. The equation used to calculate load life used
(Equation 12-1) incorporates frame size, current flowing through the circuit breaker at the time
of transition, and the constant K for that circuit breaker’s frame size (see Table 12-1).
Equation 12-1 Load life equation