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BYPASSING & ISOLATING

(continued)

3 --- 2

ISOLATING THE AT S

Isolating is required before any service work can be

performed on the automatic transfer switch (ATS).

Refer to Figures 3–4, 3–5, 3–6, 3–7a, a nd 3–7b.

1. Bypass the closed

automatic transfer switch

contacts. See BYPASSING on page 3–1.

Align position indicator. Do not leave

thehandleinanintermediateposition.

2. Turn the Isolation Hand l e coun terc l o c kw ise (approx.

16 turns, approx. 12 turns for 4000 A) until window

shows TEST. The ATS can be tested now without

load interruption (see page 2–1).

Automatic Transfer Switch

Bypass Switch

Turn crank

counter-

clockwise

until

window

shows

TEST.

Figure 3–4. CONNECTED to TEST position.

3. Continu e turnin g Isol ation Han dl e co un tercloc kw ise

(approx. 7 turns, approx. 8 turns for 4000 A) until

the wind o w show s ISOLA TE.

Turn crank

counter-

clockwise

until

window

shows

ISOLATE.

Automatic Transfer Switch

Bypass Switch

Figure 3–5. TEST to ISOLATE position.

4. Open the lower enclosure door(s). Pull out the

side rail carriage. On 4000 A extend two support

legs; see Figure 3–7b. The n roll out the transfer

switch. It can be safely inspected in this position.

The transfer switch can also be removed for

maintenance operations.

unfold

crank

position

window

CONN

TEST

ISOLATE

counterclockwise – draws out transfer switch

Figure 3–6. Isolation Handle.

NOTE: In the TEST position the transfer switch

solenoid operator circu it is energi zed throug h

secondary disconnect contacts.

Hazardous voltage capable of causing

electrical shock, burns, or death; do not

touch any control circuit terminals.

Figure 3–7a.1000–3000 A transfer switch

isolated and pulled out for inspection.

See page 2–2 for maintenance handle use. For

1000–3000 A lifting yo ke kit 607064 is available to

facili tate lifting by using an overhead crane or similar

equipment . For 4000 A use lifting yoke 835745–001.

1000–3000 A switches weighs 350–450 lbs; use

lifting yoke 607064. 4000 A switches weigh

approx. 600 lb; use lifting yoke 835745-- 001 or

other device capable of lifting this weight to

avoid personal injury or equipment damage.

To avo id personal injury and equipment

damage on 4000 A switches, two support legs

must be extended as shown in Figure 3–7b.

Substantial initial force is required to pull out

the transfer switch (there are detents on rails).

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