29
FIG. 8.3.1 TRIP LATCH ADJUSTMENT
1.
TRIP SHAFT LEVER
2.
ADJUSTMENT SCREW
3.
LOCKNUT
TURNING THE STOPSCREW (ITEM 4) ADJUST THE CLOSE LATCH
HEIGHT UNTIL THERE IS APPROXIMATELY 1/32 INCH (0.8 MM)
CLEARANCE BETWEEN THE SPACER AND THE NOSE OF THE CLOSE
LATCH. HOLD THE STOPSCREW SECURELY WITH THE ALLEN WRENCH
WHILE TIGHTENING THE LOCKNUT.
REFERRING TO FIGURE 8.2.2, THE ADJUSTMENT PROCEDURE FOR
THE LOWER STOP SCREW IS AS FOLLOWS. BE SURE THAT THE CLOSING
SPRING IS DISCHARGED AND THAT THE MAIN CONTACTS ARE OPEN.
LOOSEN LOCKNUT (ITEM 5). MANUALLY DEPRESS THE CLOSE LATCH
(ITEM 2) UNTIL IT STOPS ON THE LOWER STOPSCREW (ITEM 6).
TURNING THE STOPSCREW, ADJUST THE CLOSE LATCH HEIGHT UNTIL
THERE IS APPROXIMATELY 1/32 INCH (0.8 MM) CLEARANCE BETWEEN
THE RATCHET WHEEL TOOTH VALLEY AND THE NOSE OF THE CLOSE
LATCH. HOLD THE STOPSCREW SECURELY WITH THE ALLEN WRENCH
WHILE TIGHTENING THE LOCKNUT.
8.3 TRIP LATCH ADJUSTMENT
THIS ADJUSTMENT, LOCATED ON THE OUTSIDE OF THE LEFT
HAND SIDE MECHANISM SIDE PLATE, CONTROLS THE ENGAGEMENT OF
THE TRIP LATCH ROLLER. IF THIS ENGAGEMENT IS INSUFFICIENT, THE
ROLLER MAY RELEASE DURING THE CLOSING STROKE, RESULTING IN
FAILURE TO CLOSE. THE MAIN CONTACTS MAY MOVE BUT NOT
COMPLETE THE TRAVEL.
TO ADJUST, THE FOLLOWING PROCEDURE SHOULD BE USED:
WITH TRIP SHAFT LEVER (ITEM 1 ) RESTING AGAINST ADJUSTING
SCREW (ITEM 2), LOOSEN LOCKNUT (ITEM 3) AND TURN ADJUSTING
SCREW COUNTER-CLOCKWISE TWO TURNS. CLOSE THE BREAKER
AND SLOWLY TURN THE SCREW CLOCKWISE UNTIL THE UNIT TRIPS.
NOW TURN THE SCREW COUNTER- CLOSKWISE ONE AND ONE
QUARTER TURNS AND TIGHTEN THE LOCKNUT.
FIG. 8.2.2 CLOSE LATCH ADJUSTMENT
REFERRING TO FIG. 8.2.1 THE ADJUSTMENT PROCEDURE FOR THE
UPPER STOPSCREW IS AS FOLLOWS:
THE RATCHET WHEEL ASSEMBLY IS MADE UP OF TWO PLATES
RIVETED TOGETHER. THE TWO PLATES ARE HELD APART BY
SPACERS LOCATED BETWEEN THE PLATES ON THE FOUR RIVETS.
ROTATE THE RATCHET WHEEL UNTIL ONE OF THE SPACERS IS
DIRECTLY ABOVE THE NOSE OF THE CLOSE LATCH (ITEM 2). LOOSEN
LOCKNUT (ITEM 3).
FIG. 8.2.1 CLOSE LATCH ADJUSTMENT
1.
RATCHET WHEEL
2.
CLOSE LATCH
3.
UPPER LOCKNUT
4.
UPPER STOPSCREW
5.
LOWER LOCKNUT
6.
LOWER STOPSCREW
