GE Industrial Solutions Power-Vac ML-20 Mechanism - Manual (Page 16)

16
SECTION 10—Checking and Installing Breakers
CAUTION: IF THE COMPARTMENT SECONDARY CON-
TROL CIRCUITS ARE ENERGIZED, THE FOLLOWING
PROCEDURE SHOULD BE FOLLOWED TO PREVENT
ARCING AND BURNING OF THE MOTOR CIRCUIT PINS IN
THE SECONDARY CONTACT BLOCKS: EITHER CHARGE THE
CLOSING SPRING MANUALLY, OR PUSH IN AND HOLD THE
MANUAL CLOSE BUTTON TO OPEN THE MOTOR CIRCUIT,
THEN PULL DOWN THE HANDLE AND EXTEND THE
BREAKER SECONDARY CONTROL CONTACT BLOCK TO
FIRMLY ENGAGE WITH ITS MATING SECONDARY CONTROL
CONTACT BLOCK IN THE COMPARTMENT. RELEASE
CLOSE BUTTON TO ACTIVATE SPRING CHARGING MOTOR.
Verify that spacing between the lower inside edges of the
breaker roller track in the metalclad compartment is 29.807”
min. to 29.857” max. Check that the breaker is OPEN and that
the closing spring is DISCHARGED. Install the PowerVac ®
circuit breaker into the DISCONNECT/TEST position in the
metalclad compartment.
CAUTION: IF CONTROL POWER IS AVAILABLE, CLOSE
THE CIRCUIT BREAKER USING THE CONTROL SWITCH ON
THE COMPARTMENT DOOR. THIS OPERATION WILL
CHECK THE ADJUSTMENT OF THE 52/LCS SWITCH. IF THE
BREAKER WILL NOT CLOSE ELECTRICALLY, RECHECK THE
52/LCS ADJUSTMENT. IF CONTROL POWER IS NOT AVAIL-
ABLE, PUSH THE MANUAL CLOSE BUTTON AND
RECHARGE THE CLOSING SPRING MANUALLY. SPRING
CHARGING WILL OCCUR AUTOMATICALLY IF CONTROL
POWER IS CONNECTED.
With the breaker in the CLOSED condition, attempt to install
the racking crank. The racking crank should be blocked by the
POSITIVE INTERLOCK. Trip the breaker and install the racking
crank and rack the breaker toward the connected position. The
spring discharge interlock will discharge the closing spring,
during the first five turns, usually between the third and fourth
if the closing spring is charged. The contacts of the circuit
breaker should remain open. (If adjustment is required see
MECHANICAL ADJUSTMENTS sections 16.7 and 16.8.) Rack
the breaker into the CONNECTED position and charge the
closing spring. If secondary control power is available the
closing spring will charge automatically. Assure that the
breaker is in the OPEN condition.
Rack the breaker from the CONNECTED back to the
DISCONNECT position. During the first three turns, the spring
discharge interlock should discharge the closing spring and
the breaker contacts should remain OPEN. (If adjustment is
required see MECHANICAL ADJUSTMENTS sections 16.7 and
16.8.)