BYPASSING & ISOLATING
(continued)
3 --- 5
5. R em o ve the movable con tac t co v er.
Useyourthumbandfingerstosqueezethesides
inward until the contact cover is released from the
shaft clamp (bo t h sides). Th en remove the
movable contact cover. See Figures 3–15 & 3–16.
squeeze movable
contact cover to
re le a s e it
Figure 3–15.
Movable contact
cover release.
mo va ble con tact cov er
sha ft cla mp
Figure 3–16. Movable
contact cover removal.
6. R einstall the movable contact cover.
After inspection reinstall the movable contact
cov er onto the movable conta ct assembly. Use
your thumb and fingers to squeeze the sides
inward until the contact cover is latched onto the
metal bracket (both sides). Figures 3–15 & 3–16.
7. R ein stall the arc chute.
Slide the arc chute (arc splitters toward the
contacts and recess for nuts outward) between the
two long threaded rods. R einstall the two long
insulator nuts (round shoulder in) and use a 5/8”
nutdriver to GENTLY tighten (cw) until snug. Do
not overtighten these nuts. See Figure 3–14.
8. R ein stall the interphase barrier.
Install the barrier over the arc chu t es and slide
it up until the four round–head screws align in the
fou r keyholes in the barrier. Then slide the barrier
dow n . Use a blade sc rew d river to tigh t en (cw ) the
fou r round – h ead screws to secu re the barrier to
the arc chute insulator nuts. See Figure 3–14.
RETURN TO SERVICE
This procedure explains how to return the automatic
transfer switch (ATS) to service after inspection and
maintenance. Observe the Bypass Switch Position indica-
tor and lights).
1. Use the two handles to roll the transfer swi tch into
the enclosure (isolation contacts facing inward) until
its crank pins engage the latch plates on both sides.
Next push in both side rails and close enclosure door.
right rail
left rail
handles
Figure 3–17.Transfer switch isolated
and pulled out for inspection.
Close the enclosure door to prevent persona l
injury in case of electrical system fault.
2. Turn Isolation Handl e clockwise (approx. 6 turns) until
the wind ow sho w s TEST and TS TEST l ight c om es on.
E
L
N
Turn crank
clockwise
until
window
shows
TEST.
Automatic Transfer Switch
Bypass Switch
Figure 3–18. ISOLATE to TEST position.
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