ABB | SACE Tmax XT
22 | © 2020 ABB | 1SDH001821A1002 - ECN000135670
Management operations | 2 - Maintenance and troubleshooting
Continued from the previous page
Faults
Possible causes
Suggestions
The circuit-breaker doesn't close
when the closing coil is powered
The trip signal of the protection
trip unit has not been reset
Press the TU Reset button
The power supply voltage of the
auxiliary circuits is too low
Measure the voltage: it should not
be 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
The cables of the coil are not
inserted correctly in the terminals
Make sure there is continuity
between cable and terminal and if
necessary reconnect the cables of
the coil to the terminals
The connections in the power
supply circuit are wrong
Check the connections using the
relevant wiring diagram
The closing coil is damaged
Replace the coil
The operating mechanism is
blocked
Perform the closing operation
manually; if the fault persists
contact ABB
The open position key lock is
activated
Unlock the lock in open position
using the relevant key
The circuit-breaker is in an
intermediate position between
connected and test or the trip
unit pushbutton is pressed
(withdrawable version)
Complete the rack-in operation
The undervoltage coil is not
energized
Make sure that undervoltage coil
is energized properly
The opening coil is permanently
energized
Correct operating condition. If
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 opening pushbutton is
pressed
The operating mechanism is
blocked
Contact ABB
The circuit-breaker doesn't open
when the opening coil is powered
The operating mechanism is
blocked
Contact ABB
The power supply voltage of the
auxiliary circuits is too low
Measure the voltage: it should not
be lower than 85 % of the rated
voltage of the coil
The power supply voltage is
different from that indicated on the
rating plate
Use the correct voltage
The cables of the coil are not
inserted correctly in the terminals
Make sure there is continuity
between cable and terminal and if
necessary reconnect the cables of
the coil to the terminals
The connections of the power
supply circuit are wrong
Check the connections using the
relevant wiring diagram
The opening coil is damaged
Replace the coil
The circuit-breaker doesn't open
despite the command of the
undervoltage coil
The operating mechanism is
blocked
Perform the opening operation
manually; if the fault persists
contact ABB
It is not possible to charge the
closing springs by means of the
manual charging lever
The operating mechanism is
blocked
Contact ABB
Continued on the next page
