Emerson 7ADTB Betreibershandbuch PDF herunterladen (Seite 12)

BYPASSING & ISOLATING

(continued)

3 --- 3

ISOLATING THE ATS

Isolating is required before any servi ce work can be

performed on the automatic transfer swi tch (ATS). Refer

to Figures 3–9, 3–10, 3–11, and 3–12.

1. Bypass the closed

automatic transfer swi tch contact s.

See BYPASSING on pages 3–1 and 3–2.

2. Turn the Isolation Handle counterclockwise (approx.

8 turns) until window showsTEST.TheTS Test amber

lightshouldcomeon.TheATScanbetestednow

without load int erruption (see p age 2–1).

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 – draws

out the transfer switch

Figure 3–10. Isolation Handle turned to TEST.

NOTE: In the 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 turning Isolation Handle counterclockwise

(approx. 6 turns) until the window shows ISOLATE.

The TS Isolated amber light should come on.

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 – draws

out the transfer switch

Figure 3–12. Isolation Handle turned to ISOLATE.

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