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FIG. 5. 10.1 SHUTTERS - CLOSED POSITION
1. OPERATING MECHANISM
2. LINE SIDE BARRIER
3. LOAD SIDE BARRIER
4. PADLOCK BRACKET
FIG. 5.10.2 SHUTTERS - OPEN POSITION
1. LINE SIDE CONTACT STAB
2
.
LOAD SIDE CONTACT STAB
6. PRE-SERVICE INSPECTION
THE FOLLOWING ITEMS SHOULD BE SPECIFICALLY CHECKED
BEFORE A BREAKER IS PLACED IN SERVICE OR THE CONTROL CIRCUIT
IS ENERGIZED.
THE BREAKER SHOULD BE ROLLED OUT OF THE COMPARTMENT ON
THE FOLD- DOWN CRADLE RAILS, OR PLACED ON A BENCH FOR
BETTER ACCESSIBILITY. FOR FIXED MOUNTED BREAKERS, ENSURE
THAT THEY ARE ISOLATED FROM BOTH MAIN AND CONTROL POWER.
6.1 MAKE A VISUAL INSPECTION TO ENSURE THAT NO PARTS
HAVE BEEN DAMAGED OR FORCED OUT Of ALIGNMENT.
6.2 CHECK ALL THE CONTROL WIRING TO ENSURE THAT IT HAS
NOT BEEN DAMAGED.
6.3 CHECK THE DOOR INTERLOCK LEVER, FACE KEY INTERLOCK
AND ME- CHANICAL INTERLOCK MECHANISM FOR FREEDOM OF
MOVEMENT IF SUPPLIED.
6.4 ENSURE THAT THE USD RELAY SETTINGS CONFORM WITH
THE REOUIRED TRIPPING CHARACTERISTICS.
6.5 OPERATE BREAKER SEVERAL TIMES MANUALLY TO ENSURE
CORRECT OPERATION. NOTE THAT IF AN UNDERVOLTAGE TRIP
DEVICE IS INSTALLED, ITS MECHANISM MUST BE PHYSICALLY
BLOCKED IN THE OPERATED POSITION, SINCE WITHOUT CONTROL
POWER IT WILL HOLD THE CLOSING MECHANISM IN A TRIP-FREE
STATE AND PREVENT CLOSING. THE SAME APPLIES TO A DOOR
INTERLOCK IF INSTALLED. THE MANUAL TRIP BUTTON MUST BE
LOCKED IN THE "OUT" POSITION, OR THE INTERLOCK LEVER
BLOCKED IN THE "IN" POSITION WHEN THE CUBICLE DOOR IS NOT
CLOSED.
FIG. 5.9.2 CRADLE PORTION OF MECHANICAL INTERLOCK
1. INTERLOCK BRACKET ASSEMBLY
2. CABLES TO OTHER CRADLE
5.10 SHUTTERS
SHUTTERS ARE AVAIIABLE ON MOST FRAME SIZES Of BREAKERS
TO COVER BOTH LINE AND LOAD MAIN CONTACT STABS INSIDE THE
CRADLE.
THEY ARE CLOSED, COVERING THE CONTACTS WHEN BREAKER
IS WITHDRAWN FROM THE "OPERATING" POSITION AND ARE OPENED,
EXPOSING THE CONTACTS WHEN BREAKER IS CRANKED IN TO THE
"OPERATING" POSITION.
A PADLOCK BRACKET IS PROVIDED SO THAT SHUTTERS CAN BE
LOCKED IN THE CLOSED POSITION WHEN THE BREAKER IS REMOVED
FROM THE CRADLE.
THE SHUTTER MECHANISM IS OPERATED BY THE BREAKER
FRAME.
