11
1VAL050601-MB Rev C
RACKING: AMVAC™ circuit breakers are provided with three positive stop racking positions.
“Disconnect” position allows for (door open) manual opening only through the use of the manual opening handle (spring
loaded) or operation through the use of the electrical close / open pushbuttons located on the breaker front escutch-
eon, provided this operation is performed within 200 seconds from the time control power was last applied. Second-
ary control power plugs and primary stabs are disconnected with primary stab shutters closed.
“Test” position allows for (door closed) electric operation through the use of the internal stored energy capacitor and ex-
ternal control signals or optional breaker door mounted pushbuttons. Secondary control power plugs are connected
with primary stabs disconnected and primary stab shutters closed.
“Connected” position allows for (door closed) electric operation through the use of the internal stored energy capacitor
and external control signals or optional breaker door mounted pushbuttons. Secondary control power plugs and pri-
mary stabs are connected with primary stab shutters open.
TEST → CONNECTED :
1. Perform visual inspection of the circuit breaker:
a. Verify READY indicator is ON (off may indicate loss of control power and/or breaker malfunction).
b. Verify breaker is OPEN (push open button or initiate external electric trip if CLOSED).
c. Verify switchgear breaker door is closed and secured.
2. Begin racking procedure using approved racking crank:
a. Insert racking crank socket into breaker door access port and rotate until socket slides into position.
b. Hold racking crank with left hand and depress position lever with right hand.
c. Turn racking crank clockwise for a ¼ turn before releasing position lever.
d. Continue racking clockwise (approx. 21 turns) until ”Connected” position is reached. As the breaker approaches
the connected position, an increase in racking force is required to lift the shutters and to engage the primary
contacts.
e. A positive stop will be felt and the position release lever will snap into up position.
f. Relieve tension on the racking pin and mechanical / electrical interlocks by reversing the racking crank slightly.
CONNECTED → TEST :
1. Perform visual inspection of the circuit breaker:
a. Verify breaker is OPEN (initiate external electric trip if CLOSED).
b. Verify switchgear breaker door is closed and secured.
DISCONNECT → TEST :
1. Perform visual inspection of the Circuit Breaker:
a. Verify breaker is OPEN (use Manual Open Handle if CLOSED).
b. Verify switchgear breaker door is closed and secured.
2. Begin racking procedure using approved racking crank:
a. Insert racking crank socket into breaker door access port and rotate until socket slides into position.
b. Hold racking crank with left hand and depress position lever with right hand.
c. Turn racking crank clockwise for a ¼ turn before releasing position lever.
d. Continue racking clockwise (approx. 4 turns) until “Test” position is reached.
e. A positive stop will be felt and the position release lever will snap into up position.
f. Relieve tension on the racking pin and mechanical / electrical interlocks by reversing the racking crank slightly.
INSERTION AND REMOVAL
Provided by Northeast Power Systems, Inc. (NEPSI)
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