Emerson 7000 SERIES 7ADTB manual Bypassing & Isolating, Bypassing the ATS, To Bypass Normal Source

SECTION 3 BYPASSING & ISOLATING

BYPASSING THE ATS*

This procedure explains how to Bypass the closed automatic transfer switch contacts. Bypassing is required before the ATS can be tested or isolated. The Bypass Handle must be in the OPEN position (green indicator) and the Isolation Handle must be in the CLOSED position (window). See Figures 3–1, 3–2, and 3–3.

Indicator shows:

green ● OPEN when the ATS is not bypassed.

To Bypass Normal push in handle all the way & turn it clockwise.*

You can only bypass to the same source that the Transfer Switch is connected.

Solenoid interlock prevents incorrect operation.

1.Observe which Transfer Switch Connected To light is on (Normal or Emergency) on the door. This is the position of the automatic transfer switch.

2.Bypass to the same source as connected to transfer switch as follows (select Normal or Emergency).

Indicator shows:

yellow ● EMERGENCY CLOSED

when ATS is bypassed to Emergency or

yellow ● NORMAL CLOSED when ATS is bypassed to Normal Source.

To Bypass Emergency pull out han- dle all the way & turn it clockwise.*

Figure 3–1. Bypass Handle and position indicators.

To Bypass Normal Source*

(Load connected to Normal Source)

The Transfer Switch Connected To Normal light is on and Transfer Switch Connected To Emergency light is off.

Push in* the Bypass Handle all the way, then turn it clockwise until Bypass Switch Position shows CLOSED on NORMAL (yellow indicator). The red light Unit Not In Automatic will flash.

Push in	Bypass Switch	E
Bypass
Handle
&
turn it
clockwise.		L
		N
	ATSE

Figure 3–2. Bypass to Normal.

To Bypass Emergency Source*

(Load connected to Emergency Source)

The Transfer Switch Connected To Emergency light is on and Transfer Switch Connected To Normal light is off.

Pull out* the Bypass Handle all the way, then turn it clockwise until Bypass Switch Position shows CLOSED on EMERGENCY (yellow indicator). The red light Unit Not In Automatic will flash.

Pull out	Bypass Switch	E
Bypass
Handle
&
turn it
clockwise.		L
		N
	ATSE

Figure 3–3. Bypass to Emergency.

The automatic transfer switch can now be put in the TEST or OPEN position. See ISOLATING on page 3–2.

*NOTE: When Accessory 66A (reversed Normal & Emergency connections) is specified, the handle push–pull operation is reversed. Follow instructions on the door.

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