Emerson 7000 SERIES ATB Installation Inspection, Move ATS from Disconnected To Test Position

INSTALLATION (continued)

Inspection 1

!

Do not force the Isolation Handle. Be sure that the sensing lead isolation contacts do not hit the male stabs head on, but rather slide on them.

		sensing lead contact
IS	stab		TS
			isolation contacts

Figure 1–5. Isolation contacts in TEST position.

	Move ATS from DISCONNECTED To TEST Position
	(without electrical power)
Action	Turn the Isolation Handle (Figure 1–3) clockwise approximately 7 or 8 turns.
Observe	The Transfer Switch should be pulled inward; the sensing lead isolation
	contacts should make with the male stabs as shown in Figure 1–5.
	Inspection 2

!

Do not force the Isolation Handle. Be sure that the isolation contact fingers make with the male stabs on both sides in the CONNECTED position.

IS TS

Figure 1–6. Isolation contacts CONNECTED

(CLOSED).

Move ATS From TEST To CONNECTED Position

(without electrical power)

With solenoid latch interference tag in place (Figure 1–2), continue slowly

Action turning the Isolation Handle clockwise until it stops (approximately 6 or 7 turns). Now remove the interference tag from the solenoid latch.

The Transfer Switch should be pulled inward; the isolation contact fingers

Observe should make with the male stabs as shown in Figure 1–6. Also check that the Bypass Switch switched neutral contacts have opened (Figure 1–4).

Inspection 3

!

Be sure that the isolation contacts disconnect in the TEST position; the sensing lead contacts should still touch the male stabs.

IS TS

Figure 1–7. Isolation contacts back in TEST position.

	Move ATS From CONNECTED Back To TEST Position
	(without electrical power)
Action	Turn the Isolation Handle (Figure 1–3) back counterclockwise until the
	isolation contacts separate (approximately 6 or 7 turns).
	The Transfer Switch should be pushed outward; the isolation contacts
Observe	should disconnect, but the sensing lead contacts should remain touching
	as shown in Figure 1–7.

If all inspections are satisfactory connect harness plugs J2 and J5. Proceed to the Function Test.

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