GE Industrial Solutions Entellisys Low Voltage Switchgear - Manuel (Page 42)

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7. Operating the Switchgear
7-1 Circuit Breaker Operation
General
Included below are abbreviated operating instructions
for EntelliGuard E circuit breakers. Before activation of
the circuit breakers or operation of the switchgear
equipment, thoroughly read, and be familiar with the
circuit breaker manuals which will be supplied as
supplementary information to this manual. Publication
number is: DEH-41526.
Manually Operated Breakers
Closing Manually Operated EntelliGuard E Circuit
Breakers
Manually operated EntelliGuard E circuit breakers are
equipped with an integral charging handle and a push
button marked CLOSE on the front of the escutcheon.
The spring must be charged first.
1. A complete charge is accomplished by pulling the
handle down about 90° (until it stops) ten times to
fully charge the closing springs. This will not close
the breaker contacts. The charge indicator will
show CHARGED on a yellow background.
Opening Manually Operated EntelliGuard E Breakers
A mechanically operated OPEN button mounted on the
breaker escutcheon, operates the trip shaft to open the
breaker. The breaker may also be tripped by the
Entellisys HMI.
Electrically Operated Breakers
The breakers may be closed by a mechanically operated
push-button switch on the breaker escutcheon or by the
Entellisys HMI. Control circuit fuses are located in the
breaker compartment, just behind the door.
Electrically Opening EntelliGuard
Breakers
Electrically operated EntelliGuard E breakers are
equipped with both a shunt trip and a flux shifter for
opening the breaker. A normally open auxiliary switch
“A” contact opens the shunt trip control circuit after the
breaker opens, preventing damage to the device. The
shunt trip and flux shifter operate in response to OPEN
and TRIP commands, respectively, from the HMI breaker
control screen.
7-2 Circuit Breaker Drawout
Operation
Breaker Positions
Refer to Fig. 7-1. The drawout operation features four
positions:
1. CONNECTED - In the CONNECTED position, the
primary and secondary disconnects are fully
engaged. The breaker must be opened before it
can be racked out of this position.
2. TEST - When in the TEST position, the primary
contacts are disconnected, but the secondary
contacts remain engaged. This allows complete
breaker operation without energizing the primary
circuit.
3. DISCONNECTED - In the DISCONNECTED position,
neither primary or secondary contacts are made.
Breakers may be racked between these three
positions with the compartment door closed and
latched.
4. WITHDRAWN - With the door open, the breaker
can be rolled out manually from the
DISCONNECTED to the WITHDRAWN position.
Here, the breaker is completely out of its
compartment, ready for removal.
Fig. 7-1. EntelliGuard E circuit breaker
shown in DISCONNECTED position
Drawout Operation
All breakers are supported on the drawout rails mounted
on the side walls of the cassette. On EntelliGuard E
breakers, two wheels on each side of the breaker rest on
each drawout rail.
Motion is provided by a mechanism mounted on the
bottom of the cassette. This mechanism drives racking
cams which engage pins anchored to each side of the
breaker.
The cams are driven by a removable racking handle or
remote racker which engages the mechanism. The
handle is inserted through an opening in the cassette
escutcheon below the breaker.
Turning the handle in a clockwise direction drives the
breaker into the compartment. As the breaker
disconnect fingers engage the stab tips, a high force will
be felt. Turn the racking handle until the indictor barrel
clearly shows CONNECTED.
The position of the breaker is given by the position
indicator in the cassette escutcheon as it moves through
the door cutout.