ABB | SACE Emax 2
Putting into service and maintenance | 2 - Identification of alarms or failures
57 | © 2019 ABB | 1SDH001000R0002 - ECN000109166 - Rev. D
Continued from the previous page
Faults
Possible causes
Suggestions
It is not possible to remove
the circuit-breaker from the
disconnected position
Fail Safe lock active
Discharge the closing springs of the
command
Tripping times shorter than
expected
Selected threshold too low
Modify the threshold
Wrong curve selected
Modify the curve
Thermal memory enabled
Disable it if it is not necessary
Incorrect neutral selection
Modify the neutral selection
Zone Selectivity enabled
Disable it if it is not necessary
Tripping times longer than
expected
Threshold too high
Modify the threshold
Curve too high
Modify the curve
Wrong curve selected
Modify the curve type
Incorrect neutral selection
Modify the neutral selection
Rapid trip with I3 = Off
linst trip
Correct operating condition with
short circuit at high current
High ground-fault current, but
no trip occurs
Function G inhibited owing to high
current
Correct operating condition (see
use cases in the chapter that
describes the protection)
Incorrect current reading
Current below the minimum
threshold that can be displayed
Correct operating condition.
The expected trip does not
occur
Trip excluded
Correct operating condition. Enable
trip if necessary