IB 6.2.11.1-2C
Page 14
ABB
Figure 3)
FOR SAFETY:
Keep clear of breaker operating parts
during this operation.
a. Close the breaker. Lever (11, Figure 1) must be in
the up position.
b. For each set of eight contacts on one pole, the
smallest gap "A" should be 0.105-0.110 inch. If
adjustment is required, loosen lock screw (2, Figure 3).
Turn adjustment screw (1) until 0.105-0.110 inch is
obtained on the smallest gap of the eight contacts.
Repeat this for the other two poles. Tighten lock screw
(2).
Note that if an adjustment is necessary for
"simultaneous" make, the contact pressure will increase
on those adjusted poles. Thus, a dimension of more
than the ranges listed above indicates more contact
pressure, which is acceptable.
Manual Slow Close to Check Contact Pressure (See
Figures 1, 3 and 4)
a. Remove arc chutes (1, Figure 1).
b. If the circuit breaker closing springs are discharged
as seen by the spring charged indicator (6), engage the
manual charge handle (16) with the charging lever.
Pump charging handle until the circuit breaker closing
springs are heard to snap into the charged position
(also check the indicator (6)).
c. Remove screw, shift the shutter to the left and insert
the spring retainer bracket so that its tips fit into the
closing springs and its flanges fit into the holes in the
closing spring guides.
NOTE: Shutter cannot be opened unless breaker
drawout mechanism is in the "DISCONNECT"; "TEST"
or "CONNECTED" position. The drawout lever (11)
cannot be operated when shutter is open.
d. Use a stick to hold the spring retainer bracket toward
the front of the breaker and in place while pulling the
manual close lever (12) to discharge the closing
springs. (This will partially close contacts.)
e. Insert the manual charge handle (16) into the
charging lever socket and pump to slow close the circuit
breaker.
f. To remove the spring retainer bracket, push the
manual trip button (10) to trip the circuit breaker.
Continue pumping until closing springs are again heard
to snap. Then remove spring retainer bracket. The
circuit breaker is now charged and ready to be closed.
h. To discharge closing springs, pull the manual close
lever (12) and push manual trip button (10).
