Page 259 - Sace Emax 2 Manual for design engineers

ABB | SACE Emax 2
Faults, causes and remedies The following is a list of possible fault situations, their possible causes and suggestions for resolving them.
Faults Possible causes Suggestions
Press the TU mechanical reset
The trip signal of the protection trip
unit has not been reset pushbutton or operate the electrical
reset remotely.
The open-position key lock or padlock Unlock the lock in open position using
is activated the relevant key
The circuit-breaker is in an
The circuit-breaker intermediate position between
doesn't close when the connected and isolated for test Complete the rack-in operation
closing pushbutton is or between isolated for test and
pressed disconnected
Check the power supply circuit and
The undervoltage coil is not energized
the power supply voltage
The opening coil is permanently Correct operating condition.
energized
The trip unit pushbutton is pressed Rotate the crank to complete
(withdrawable version)
The trip signal of the protection trip
unit has not been reset Press the TU Reset button
Measure the voltage: it should not be
The power supply voltage of the
auxiliary circuits is too low lower than 70% of the rated voltage of
the coil
The power supply voltage is different
from that indicated on the rating plate Check the voltage on the rating plate
Make sure there is continuity between
The cables of the coil are not inserted cable and terminal and if necessary
correctly in the terminals reconnect the cables of the coil to the
terminals
The connections in the power supply Check the connections using the
circuit are wrong relevant wiring diagram
The closing coil is damaged Replace the coil
The circuit-breaker Perform the closing operation
doesn't close when the The operating mechanism is blocked manually; if the fault persists contact
closing coil is powered ABB
Unlock the lock in open position using
The open position key lock is activated
the relevant key
The circuit-breaker is in an
intermediate position between
connected and test or the trip unit Complete the rack-in operation
pushbutton is pressed (withdrawable
version)
Make sure that undervoltage coil is
The undervoltage coil is not energized
energized properly
Correct operating condition. If
The opening coil is permanently
energized necessary, disconnect the power from
the opening coil
The racking out crank handle is
inserted (withdrawable version) Remove the crank
The circuit-breaker
doesn't open when the The operating mechanism is blocked Contact ABB
opening pushbutton is
pressed

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257 | © 2020 ABB | 1SDH001330R1002 - ECN000134959 - Rev. A Alarms or failures | 1 - Identification of alarms or failures