ABB SACE Emax E2.2 Installation, Operation And Maintenance Instructions For The Installer And The User page 59

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