Page 91 - SACE Tmax XT - Catalogue

PROTECTION TRIP UNITS 3/57

03
Operation counter Events
In the presence of a power supply, the trip unit re- The last 200 events are recorded. The following
cords information about the openings of the cir- information is available:
cuit-breaker including: • trip unit: configuration status of the bus,
• the number of manual openings operating mode, active set, auxiliary power
• the total number of operations (manual + trips). supply
By activating communication with the trip unit, • protections: delay in action or alarms
the following parameters are also available: • connection states or alarms: circuit-breaker,
• the number of openings due to protection current sensors, trip coil, rating plug
tripping • tripping: state of the opening command, or
• the number of openings for which tripping has signal of tripping for protection.
not been completed in due time (back-up The icons help to quickly understand the type of
commands have been necessary) event:
• the number of opening tests performed. i event reported for information purposes

Contact wear delay of a protection in progress, trip
This gives an estimation of the conditions of the expected
main circuit-breaker contacts. The value is ex- ! alarm referring to a non-hazardous condition
pressed as a percentage, and is 0% in case of no
wear, and 100% in case of total wear. This is calcu- alarm for operation, failure, or connection
lated automatically by the trip unit at every open- fault.
ing for protection or, in the presence of a power
supply, also at every manual opening of the cir- Synchrocheck
cuit-breaker. Synchrocheck measurements relating to the func-
tion of synchronism between two independent
Openings power sources.
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.