ABB SACE Tmax XT2 User Manual page 99

Maintenance The Measurements-Maintenance menu includes some information on the status of the CB.
Contact wear
Contact wear indicates an estimate of the state of deterioration of the main contacts of the circuit
breaker. The value is expressed in percentage value, and is 0% in the event of no wear and
100% in the event of complete wear.
It is automatically calculated by the Trip unit at each opening due to protection, or, if there is an
auxiliary power supply, also at each manual opening of the circuit breaker.
Maintenance
The Maintenance function allows notifying the user with a Warning alarm that:
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Two areas are available in Trip unit menus:
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The date of reference is that of the internal clock, and the elapsed time is calculated whether the
trip unit is on or off (as long as the internal battery is working).
Counter CB operations (total of manual operations and TRIPs) are recorded by the Trip unit with an
operations auxiliary power supply and available in the Information-Circuit Breaker menu.
By activating communication with the Trip unit the following counters are also available:
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1SDH002031A1002 ECN000092998
NOTES:
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Upon reaching 100%, the percentage does not increase any further
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The achievement of 80% is signaled with a pre-alarm, while the achievement of
100% is signaled with an alarm
IMPORTANT: 100% wear does not imply any functional limit on the Trip unit, but
it is necessary to check the status of the circuit breaker as soon as possible
One year has passed since the last maintenance
Contact wear increased by more than 10% compared to the last maintenance value
Activation area (Settings - Maintenance menu): allows activating the Maintenance function
Measurements and reset area (Measurements - Maintenance menu): appears only if the
Maintenance function is activated. Provides information on the maintenance (contact wear
and dates) and the command to confirm the maintenance (confirming the current date and
contact wear values are recorded, and the alarm signal is reset).
NOTE: manually changing the date may cause changes in the calculation of the
elapsed time, and therefore also of the next maintenance date
NOTE: the indication of maintenance due to increased contact wear is active for values
exceeding 20%
Number of manual operations
Number of openings due to trips (TRIP)
Number of openings due to failed trips
Number of opening tests performed
Rev. B
SACE Tmax XT2 – XT4 | 99