Contact Wear; Datalogger - ABB SACE Emax E1.2 Operating Instructions For The Design Engineer

Contact Wear Path
Datalogger Path
108 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
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Description
Contact wear gives an estimation of the conditions of the circuit-breaker's main contacts.
The value is expressed as a percentage, and is 0 % in the case of no wear, and 100 % in the case of total
wear.
The contact wear is calculated automatically by the trip unit at every opening for protection or, in the presence
of an auxiliary power supply, also at every manual opening of the circuit-breaker.
NOTE:
• On reaching 100%, the percentage is not increased any further.
• Reaching of 80% is signalled with a prealarm, while reaching of 100% is signalled with an alarm.
IMPORTANT: 100% wear doesn't involve any functional limit for the trip unit, but the
condition of the circuit-breaker must be checked as soon as possible.
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Description
The datalogger it is a function that allows the recording of data associated to a trigger event.
The data recorded are:
• Analog measurements: phase currents and line-to-line voltages (if the Ekip Measuring or Ekip Measuring
Pro module is present).
• Digital events: protection alarms, circuit-breaker state signals, tripping of protections.
When the datalogger is activated, the protection trip unit continuously acquires data, by filling and emptying
an internal buffer. If a trigger event occurs, the trip unit inhibits acquisition (either immediately or with a time-
lag that can be adjusted by the user) and stores the data, which can then be downloaded to a PC for reading
and analysis.
IMPORTANT: the function is available with trip unit energized with auxiliary voltage.
Figure 29
Pos. Description
A Trigger event
Data samples
B
NOTE: the set sampling frequency establishes the number of samples acquired per
second.
C Time delay before stopping of recording
Recording window
D
NOTE: the window changes, depending on the set sampling frequency.
Continued on the next page
Ekip Touch protection trip unit | 15 - Touch measurements
ABB | SACE Emax 2