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27.20 Fault indication and fault evaluation
A fault will always shut down the associated motor operating mechanism, and can be issued as a fault
indication when a SIPROTEC relay is installed. The fault is generally reset by switching the auxiliary voltage
off and on again.
For several fault outputs, the fault signal is reset automatically or by certain actions.
Type of fault
Motor voltage is not switched on
Motor voltage is not switched off
No feedback of auxiliary switch
during command "rack withdrawable
circuit-breaker / circuit-breaker truck
to service position"
No feedback of auxiliary switch
during command "rack withdrawable
circuit-breaker / circuit-breaker truck
to test position"
No automatic shutdown after end of
command
High-voltage door is open while the
withdrawable circuit-breaker / circuit-
breaker truck is being racked
The
withdrawable
circuit-breaker /
circuit-breaker truck is racked and
stops in an intermediate position
when the motor voltage fails
The auxiliary voltage and the motor
voltage
fail
while
racking.
auxiliary switch does not report a
valid end position
1)
This fault signal can be reset
110-0134.9 / 14
Panels with motor operating mechanism control
Reverse interlocking
to circuit-breaker
On
On
On
On
On
On
On
The
On
NXAIR / ≤ 40 kA
Cause / Remedy
Check MCB or wiring
Motor voltage relay in motor control
unit defective
Check operating mechanism or motor
with respect to blocking
1)
Check operating mechanism or motor
1)
with respect to blocking
Circuit for automatic shutdown in
motor control unit defective
Operating mechanism stops
When the motor voltage is switched on
again, the withdrawable circuit-
breaker / circuit-breaker truck can be
racked to a valid end position by hand.
Then, the fault is reset
When the auxiliary voltage and motor
voltage are switched on again, the
fault can be reset by manual operation
to a valid end position
413
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