GE Industrial Solutions PowerVac with ML-18 or ML-18H Mechanism - Manual (Page 16)

16
SECTION 10—Checking and Installing Breakers
CAUTION: IN THE DISCONNECTED/TEST POSITION IF THE
COMPARTMENT SECONDARY CON- TROL CIRCUITS ARE
ENERGIZED, THE FOLLOWING PROCEDURE MUST 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.
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.
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.
NOTE: When inserting the breaker and prior to racking, the
operator must ensure that both the right and left side racking
arms are engaged on the drive blocks. Racking arms must be
fully engaged for breaker to rack in properly. Failure to do so
could result in jamming of the racking arms with the guide rail.
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.
During the first five turns, usually between the third and
fourth turns, the spring discharge interlock will discharge the
closing spring. 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.)
With the breaker in the disconnect position and the closing
spring discharged, rack the breaker in 5-7 turns. With control
power on, plug in secondary disconnect. Spring charge motor
should not operate.