8
Trip Screw Adjustment
With the breaker CLOSED, the trip screw [3] must
have zero clearance with the breaker trip paddle. If
adjustment is necessary, OPEN the breaker, make the
adjustment, then CLOSE the breaker to check the
adjustment. Be sure to retighten the adjusting nut.
WARNING
: Be extremely careful when working on a
CLOSED breaker.
Do not
reach your hands into the
mechanism while adjusting the flux shifter.
Microswitch Linkage
The following procedure is illustrated in Figures 4, 6,
7, and 8.
1.
Loosen the two top adjusting nuts on the
microswitch link connecting rod [10], as shown in
Figures 6 and 8. Do not attempt to loosen the two
lower nuts, as they have been secured at the
factory with Loctite
®
. Place a
1 4
" flat washer
over the supplied
1
4-20 bolt. Insert the bolt in
sequence through the hole in the microswitch
link [11] and the breaker reset link [12]. Place
another flat washer over the bolt, then slide the
bolt through the slot in the flux shifter reset arm
[1]. Place a flat washer and the self-locking nut on
the bolt.
Do not
overtighten the nut, as the bolt
must be free to rotate within the connecting links.
2.
With the breaker in the OPEN (reset) position,
push the lower link [7] down until the mounting
pin is at the top of the slot. Tighten the two
adjusting nuts on the connecting rod [10] to
secure the microswitch link.
3.
If required, loosen the two adjusting nuts on the
microswitch plunger [9], located on the
stationary bracket. Adjust the linkage so that the
microswitch position follows the breaker contact
position (microswitch is closed when the breaker
is CLOSED). Retighten the adjusting nuts.
Flux Shifter Test
The operation of the flux shifter may be tested by
closing the breaker, then applying 9 Vdc to the flux
shifter leads (red is positive). The breaker should trip
and reset. If necessary, repeat the adjustments in the
previous procedures.
Figure 6. Flux shifter assembly installed, as viewed from the
bottom of the breaker.
Figure 7. Flux shifter assembly installed, as viewed from the right
front of the breaker (LA-800 shown). .
Mounting
Stud
Breaker
Reset
Link
Flux Shifter
Reset Link
Microswitch
Link
Breaker
Reset Link
Trip
Paddle
Microswitch
Link
Adjusting
Nuts
