PROTECT ION TR I P UNI TS
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Events The last 200 events are recorded. The following in - formation is available: • trip unit: configuration status of the bus, operating mode, active set, auxiliary power supply • protections: delay in action or alarms • connection states or alarms: circuit-breaker, current sensors, trip coil, rating plug • tripping: state of the opening command, or signal of tripping for protection. The icons help to quickly understand the type of event:
Operation counter In the presence of a power supply, the trip unit re- cords information about the openings of the cir- cuit-breaker including: • the number of manual openings • the total number of operations (manual + trips). By activating communication with the trip unit, the following parameters are also available: • the number of openings due to protection tripping • the number of openings for which tripping has not been completed in due time (back-up commands have been necessary) • the number of opening tests performed. Contact wear This gives an estimation of the conditions of the main circuit-breaker contacts. The value is ex- pressed as a percentage, and is 0% in case of no wear, and 100% in case of total wear. This is calcu - lated automatically by the trip unit at every opening for protection or, in the presence of a power supply, also at every manual opening of the circuit-breaker. Openings Information about the last 30 openings are available. In particular: • tripped protection • the progressive number of the opening • the date and time of the opening (referred to the internal clock) • measurements associated with the trip protection. The most recent opening is viewable also by pressing the iTest key.
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event reported for information purposes delay of a protection in progress, trip expected alarm referring to a non-hazardous condition alarm for operation, failure, or connection fault.
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Synchrocheck Synchrocheck measurements relating to the func- tion of synchronism between two independent power sources.
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