ABB hd4 Installation And Service Instructions Manual page 33

Subject of the inspection
11 Locking electromagnet on
the circuit-breaker truck
(YL2) (if provided).
12 Auxiliary transmitted
contacts for indicating
that the circuit-breaker
is connected, isolated
(CBE or PowerCube
enclosures).
13 Electromechanical locking
device (if provided)
(CBE or PowerCube
enclosures).
Procedure
With the circuit-breaker open in the isolated for test position
and the locking electromagnet not supplied, attempt to
connect the circuit-breaker.
Supply the locking electromagnet and carry out the
connection operation.
Insert the auxiliary contacts into suitable signalling circuits.
With the circuit-breaker inside the enclosure carry out a few
translation operations from the isolated for test position to
the connected position.
Put the circuit-breaker in the withdrawn position.
With no supply to the locking device try to rack-in the
circuit-breaker into the enclosure.
Supply the locking device at the relative rated voltage. Carry
out the racking-in operation.
Positive check
Connection is not possible.
Connection takes place correctly.
The signals of the relative operations occur correctly.
Racking-in is not possible.
Racking-in is possible.
33