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Maintenance
Page
13
After the trip
mechanism has operated
, or if any
of the power
fuses have been removed or
replaced
,
the following checks
and adjustments
must be
performed
.
Figure 11
.
Adjustment
of Trip
Mechanism in
Deactivated Position
.
5
.
Referring
to
Figure 12
,
insert a 3
/
16 " ( 4.8 mm
)
thick shim
between one of the three plungers and the adjacent fuse
,
rotating the trip bar in the direction shown
.
The micros
-
witch
contacts
should open
at
this point
.
If they do
not
,
loosen the locknut and adjust the machine screw
to
short
-
en dimension " A
"
slightly until the switch contacts open
,
then retighten
the locknut
.
Figure 10
.
Adjustment of the Plunger
1
. All
fuses must be installed in clips with load side of fuse
resting on support tray as
shown in
Figure 10
.
Plunger
end
of fuse must be
facing forward
,
away from
discon
-
nect
fingers on contactor .
2
. With
the trip bar in its normal spring return ( deactivated
position
,
the trip bar should
rest
against the
stop screw on
the right hand contactor side plate as shown in Figure 10
.
The trip bar
must
be held in this position while performing
adjustments
3
and
4
.
3 . Adjust each of the three plunger assemblies shown in
Figure 10
to
obtain a
1
/
16
"
( 1.6 mm ) gap between the
plunger
( 1 )
and the end of the corresponding fuse as
follows
:
Insert a
1
/
16
"
( 1.6
mm
)
shim between the end of
the fuse and the plunger ( 1 )
. Loosen locknut
( 2 )
and
turn
adjusting screw
( 3 )
until there is no gap between stop
nut
( 4 ) and
trip
bar ( 5 )
.
Retighten lock
nut ( 2 )
.
4
.
Referring
to Figure 11
,
loosen the machine
screw
which
threads into the pushrod and adjust outward
( lengthen )
until the micro
-
switch contacts just close . Then adjust
outward one additional full turn and tighten the locknut .
Figure 12
.
Operational Check of Trip
Mechanism
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