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Instructions for VR-Series
Replacement Breakers for
Westinghouse Type B20B/B22B
IB01301018E
I.B. 94A1994R01
Page 14
Effective: April 2005
Figure 4-3 B20B/B22B-VR Test / Disconnect Position
(B22B-VR Shown)
3. Install supplied MOC / TOC bracket in cell. (Reference drawing
no. 7961D81G45)
4. The cell mounted “Y” relay must be disabled in the closing circuit
as described in the wiring diagrams and schematics supplied with
the circuit breaker.
FAILURE TO JUMPER THE “Y” RELAY WILL PREVENT PROPER
OPERATION OF THE VACUUM REPLACEMENT BREAKER.
5. Install warning label (94C9522H13) on cell door following “Y”
relay modification.
OPERATING AN ORIGINAL BREAKER IN A CONVERTED CELL
MAY LEAD TO POSSIBLE DEATH, PERSONAL INJURY OR
EQUIPMENT DAMAGE. THE CELL CONVERSION BY-PASSES THE
“Y” ANTI-PUMP RELAY AND MUST BE REVERSED PRIOR TO
INSERTION OF AN ORIGINAL CIRCUIT BREAKER.
Perform electrical operations checks. These checks can be
performed with the breaker in its withdrawn or disconnect position
by connecting the breaker to a test cabinet or to the switchgear
cell’s secondary receptacle using the special extension cable
designed for this purpose and described in section 3. Close and
trip the circuit breaker electrically several times to verify charging
motor is reasonably prompt and that the motor makes no unusual
noise.
WHILE CHECKS ARE PERFORMED IN THE BREAKER COMPART-
MENT, CARE MUST BE EXERCISED TO MAKE CERTAIN THAT
PRIMARY CIRCUIT IS NOT ENERGIZED. DO NOT PERFORM
ELECTRICAL OPERATION CHECKS WITH BREAKER IN THE
CONNECT POSITION THEREBY RISKING DEATH, PERSONAL
INJURY OR EQUIPMENT DAMAGE.
4.9 INSERTION PROCEDURE
The racking system moves the circuit breaker between the
disconnect, trip-free and connect positions. The cell lifting
mechanism is a worm driven rack and dual pinion type arrange-
ment. To prevent inadvertent lowering of the mechanism, two
locking rods are provided and inserted through components of the
cell and breaker. The racking drive shaft of the cell is exposed
where the racking handle can be engaged. The drive shaft
accuates a chain and sprocket which subsequently drives the
racks and lifting rails on each side of the cell.
The lifting points of the breaker engage switchgear cell components
to raise the breaker into the cell. A very large mechanical advan-
tage is realized because of the large number of turns of the drive
shaft needed to produce the approximate 14 inches of racking
mechanism vertical travel from disconnect to connect position.
Care and experience is needed in order to determine whether a
more than usual force is required to raise the breaker into a cell, as
this might be an indication of a mechanical interference or misalign-
ment of components. If unusual force is noted, the breaker should
be withdrawn from the cell and re-examined to determine the
reason.
DO NOT FORCE THE BREAKER INTO THE CELL. DOING SO MAY
DAMAGE PARTS THEREBY RISKING DEATH, PERSONAL INJURY,
AND/OR PROPERTY DAMAGE.
DO NOT USE ANY TOOL TO OPERATE THE RACKING MECHA-
NISM OF THE CELL OTHER THAN THE RACKING HANDLE.
PERSONAL INJURY OR DAMAGE TO THE DEVICE COULD
RESULT FROM THE USE OF A TOOL OTHER THAN THE RACKING
HANDLE.
Position the breaker in the withdrawn position by aligning the
breaker with the cell opening.
Check that the closing spring status indicator reads “DISCHARGED”
and that the main contact status indicator reads “OPEN”. Manually
trip, close, and trip the breaker as needed to obtain this status using
the manual open and close buttons. (Figure 3-3)
WARNING
WARNING
WARNING
WARNING
WARNING