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BYPASSING & ISOLATING
(continued)
3 --- 2
ISOLATING THE ATS
Isolating is required before any servi ce work can be
performedon the automatictransferswitch(ATS). Refer
to Figures 3–4, 3–5, 3–6, and 3–7.
1. Bypass the closed
automatic transferswitchcontacts.
See BYPASSING on page 3–1.
Align position indicator. Do not leave
thehandleinanintermediateposition.
2. TurntheIsolationHandle counterclockwise(approx.
16 turns) until window shows TEST.TheATScanbe
tested now without load interruption (see page 2–1).
E
L
N
Automatic Transfer Switch
Bypass Switch
Turn crank
counter-
clockwise
until
window
shows
TEST.
Figure 3–4. CONNECTED to TEST position.
3. Continue turningIsolationHandlecounterclockwise
(approx. 7 turns) until the window shows ISOLATE.
E
L
N
Turn crank
counter-
clockwise
until
window
shows
ISOLAT E.
Automatic Transfer Switch
Bypass Switch
Figure 3–5. TEST to ISOLATE position.
4. Open the lower enclosure door. Pull out the side rail
carriage then roll out the transfer switch. It can be
safely inspected in this position. The transfer switch
can also be removed for easier maintenance opera-
tions.
unfold
crank
position
window
CONN
TEST
ISOLATE
counterclockwise – draws out
transfer switching device
Figure 3–6. Isolation Handle.
NOTE: In the TEST position the transfer
switching device 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.
Figure 3–7.Transfer switching device isolated
and pulled out for inspection.
See page 2–2 for mainte nance handle use. A lifting yoke
kit 607064 is available to facilitate lifting by using an
overhead crane or similar equipment.
Transfer Switch weighs 350–450 l b s.
Use lifting device 607064 or other device
capable of lifting this weight to avoid
personal injury or equipment damage.