19
T3
item inspected
Procedure
Positive check
8
key lock (if provided).
Open the circuit-breaker, keep the opening pushbutton
depressed, then turn the key and remove it from the housing.
Attempt the circuit-breaker closing operation.
Neither manual nor electrical closing takes
place.
Put the key back in and turn it 90°.
Carry out the closing operation.
both electrical and manual closing take place
normally; in this position the key cannot be
removed.
9
Auxiliary contacts in the
operating mechanism.
Insert the auxiliary contacts in suitable signalling circuits.
Carry out a few closing and opening operations.
Signals take place normally.
10
undervoltage override
(if provided).
with the circuit-breaker open, springs charged, override not
connected and undervoltage release not supplied with power,
attempt circuit-breaker closing.
Closing is not possible.
11
Locking electromagnet
(-RL1) (if provided).
with the circuit-breaker open, springs charged and locking
electromagnet not supplied, attempt circuit-breaker closing
both manually and electrically.
Closing is not possible.
Carry out a few closing and opening operations.
N.b. Supply the undervoltage release and the locking magnet
on the operating mechanism at the relative rated voltage (if
provided).
The geared motor recharges the springs after
each closing operation.
12
Locking electromagnet on the
truck circuit-breaker (-RL2)
(if provided).
with the circuit-breaker open, in the isolated for test position
and the locking electromagnet not supplied, attempt circuit-
breaker racking-in.
Racking-in is not possible.
Supply the locking electromagnet and carry out the racking-in
operation.
Racking-in takes place correctly.
13
Auxiliary transmitted contacts
for signalling circuit-breaker
racked-in, isolated (uniGear
or uniSafe switchgear).
with the circuit-breaker racked into the enclosure, carry out a
few traverse operations from the isolated for test position to the
connected position.
Take the circuit-breaker to the racked-out position.
The signals due to the relative operations take
place normally.
DO NOT ATTEMPT TO REMOVE
THE CIRCuIT-bREAkER FROM THE
COMPARTMENT wITHOuT THE
REquIRED RAMP DOLLy ON LINk TRuk.
THE CIRCuIT-bREAkER COuLD FALL
DOwN AND DO INjuRIES TO THE bODy.
REFER TO THE SPECIFIC SwITCHGEAR
INSTALLATION AND MAINTENANCE
MANuAL FOR DETAILS.
DANGER