Page 24 - MCCB-XT5

Continued from the previous page ABB | SACE Tmax XT
Fault Possible causes Suggestions
The PIN has been disabled or Operating condition correct;
The PIN is not required has already been entered in the consult chapter relating to the
same programming session PIN
Contact ABB or consult
PIN error PIN wrong or lost
document 1SDH001501R0001
Trip coil is not connected Check Trip coil connection and
properly messages on display
It is not possible to perform the CB trip signal has not been Press the reset pushbutton
trip test reset
The busbar current is greater Correct operating condition.
than zero
1. If closed, open CB in the
manual mode and check
changed status.
2. Press iTest, check that the
signal has disappeared from
One or more of the following the display and the general
conditions:
TRIP fail signaling: Trip Fail • Trip coil not working status of the alarms.
command (BF) 3. Check the conditions of the
• status contacts not working wiring and internal contacts
• faulty internal wiring
4. Working in safety conditions,
close the CB and perform a trip
test via the trip unit

Contact ABB if problems persist
The expected trip does not Trip excluded Operating condition correct;
occur enable trip if necessary
Wrong threshold/time/curve Correct parameters
selected
Trip times different than Thermal memory enabled Disable it if it is not necessary
expected
Zone selectivity enabled Disable it if it is not necessary
Incorrect neutral selection Modify the neutral selection
Correct operating condition
Rapid trip with I3=Off linst trip with short circuit at high
current
Incorrect selection of the Set internal or external sensor
sensor
High ground-fault current, but
no trip occurs Function G inhibited owing to Operating condition correct
(see protection description
high current
chapter)
No auxiliary power supply and/
Opening data not displayed Correct operating condition.
or battery low

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