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BYPASSING & ISOLATING
(continued)
3 --- 3
ISOLATING THE ATS
Isolating is required before any servi ce work can be
performed onthe automatictransfer switch(ATS). Refer
to Figures 3–9, 3–10, 3–11, and 3–12.
1. Bypass the closed
automatic transfer switchcontacts.
See BYPASSING on pages 3–1 and 3–2.
2. Turnthe IsolationHandle counterclockwise(approx.
8 turns) until window showsTEST.TheTS Test amber
lightshouldcomeon.TheATScanbetestednow
without load int erruption (see p age 2–1).
E
L
N
Automatic Transfer Switch
Bypass Switch
Turn crank
counter-
clockwise
until
window
shows
TEST.
Figure 3–9. CONNECTED to TEST position.
TS CONNECTED
Middle amber light
should be on.
TS TEST
TS ISOLATED
position
window
CONN
TEST
ISOLATE
counterclockwise – dra ws
out the transfer sw itch
Figure 3–10. Isolation Handle turned to TEST.
NOTE: In t he TEST position the transfer
switch solenoid operator circuit is energized
through secondary disconnects.
Hazardous voltage capable of causing
electrical shock, burns, or death;
do not touch any control circuit terminals.
3. Continue turningIsolation Handlecounterclockwise
(approx. 6 turns) until the window shows IS OLATE.
The TS Isolated amber light should come on.
E
L
N
Turn crank
counter-
clockwise
until
window
shows
ISOLAT E.
Automatic Transfer Switch
Bypass Switch
Figure 3–11. TEST to ISOLATE position.
TS CONNECTED
Lower amber light
should be on.
TS TEST
TS ISOLATED
position
window
CONN
TEST
ISOLATE
counterclockwise – dra ws
out the transfer sw itch
Figure 3–12. Isolation Handle turned to ISOLATE.