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27
IB-65020A
Installation
CAUTION
CAUTION
!
Remove all grounding conductors applied for
field dielectric test before placing the circuit
breaker back into service.
4) Mechanical Operation Check
The mechanical operation of the circuit
breaker is checked by inserting the manual
charging handle into the manual charging
crank and pushing down until a metallic
click is heard. (The click indicates that the
holding pawl has dropped into place on the
ratchet wheel.) The procedure is repeated
until the spring charge indicator indicates
“Closing Spring Charged”.
This requires
approximately 60 operations of the handle.
Remove the handle.
CAUTION
CAUTION
!
Care must be exercised to keep personnel,
tools, and other objects clear of mechanism
which are to be operated or released.
Push the manual close paddle (Figure 1, o)
inward and the circuit breaker will close.
The circuit breaker open/closed indicator
(Figure 1, n), located above the
manual close paddle will now display,
“Breaker Closed”.
Push the manual trip
paddle (Figure 1, l) inward, which is located
at the top of the escutcheon and the circuit
breaker open/closed indicator will now
display
“Breaker Open”.
5) Electrical Operation Check
To check the basic electrical operation
of the circuit breaker, a circuit breaker
test cabinet should be used. Connect
the secondary disconnect from the
test cabinet to the circuit breaker to be
tested. The test cabinet provides control
voltage via a secondary disconnect plug
to the circuit breaker and the appropriate
control switches to verify the close and
open functions of the circuit breaker.
Specialized versions of the test cabinet
may also contain circuits for circuit
breakers equipped with dual shunt trip
coils, undervoltage devices, or other
options. With the secondary disconnect
plug installed in the circuit breaker under
test, operate the power switch on the
test cabinet. The charging motor will
automatically charge the stored energy
mechanism’s main closing springs.
Operation of the control switch on the front
door of the test cabinet to the
“CLOSE”
position will cause the circuit breaker to
close.
CAUTION
CAUTION
!
The MOC actuator is exposed when the circuit
breaker is outside the metal-clad switchgear
and can cause serious injury if the test
personnel or any object is in its travel path
during operation. Caution should be taken to
isolate the MOC side of the circuit breaker for
these tests.
The circuitry is arranged to cause the
charging motor to operate again and
charge the main closing spring. Operating
the control switch on the front door of the
test cabinet to the
“OPEN”
position will
cause the circuit breaker to open.
