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SECTION 3 BYPASSING & ISOLATING

3 --- 1

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.

Youcanonlybypasstothesamesourcethat

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. Bypasstothesamesourceasconnectedto

transfer

switch

as follows (select Normal or Emergency).

To B yp a s s N o rm a l push in handle

all the way & turn it clockwise.*

To B yp a s s E m e r g en c y pull out han-

dlealltheway&turnitclockwise.*

Indicator shows:

green

OPEN when the

ATS is not

bypassed.

Indicator shows:

yellow

EMERGENCY CLOSED

when ATS is bypassed to Emergency

yellow

NORMAL CLOSED when

ATS is bypassed to Normal Source.

Figure 3–1. Bypass Handle and position indicators.

To B y p a s s N o r m a l S o u r c e *

(L oad connected to Normal Source)

The Transfer Swit ch Connected To Normal light is on

and Transfer Switch Connect ed To Emergency light is off.

Push in* the Bypass Handle all the way, the n 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

Handle

turn it

clockwise.

ATS

Bypass Switch

Figure 3–2. Bypas s 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 t urn it

clockwise until Bypass Switch Position shows CLOSED on

EMERGENCY (yellow indicator). The red light Unit

Not In Automatic will flash.

ATS

Bypass Switch

Pull out

Bypass

Handle

turn it

clockwise.

Figure 3–3. Bypass to Emergency.

The automatic transfer switch can now be put in the TEST or OPEN position. Se e 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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