Emerson 7ADTB Manual do Operador descarregar pdf (Página 15)

BYPASSING & ISOLATING

(continued)

3 --- 5

RETURN TO SERVICE continued*

This proc edu r e explain s how to retur n the Bypass Switc h

HandletotheOPENposition. TheBypassHandlemust

be in the CLOSED position (yell ow indicator on

NORMAL or EMERGENCY) and the Isolation Handle

must be in the TEST position (window). If the handles

are not in these position s, refer to Return to Service on

page 3–3. See Figures 3–11, 3–12, and 3–13.

Youcanonlybypasstothesamesourcethat

the ATS is connected. Solenoid interlock

prevents incorrect operation.

1 Observe which Bypass Switch Position indicator is

yellow (NORMAL or EMERGENCY)attheBypass

Switch Handle. This indicates the source

connected to the load.

2 Un–Bypass to same source as the Bypass

Switch

Position

as follows (select Normal or Emergency).

To un–Bypass Normal push in handle

all the way & turn it counterclockw ise. *

To un–Bypass Emergency pull out

handle all the way & turn it

counterclockwise.*

Indicator shows:

green

OPEN when the

ATS is not

bypassed.

Indicator shows:

yellow

EMERGENCY CLOSED

when ATS is bypassed to Emergency

yellow

NORMAL when ATS is

bypassed to Normal Source.

Figure 3–11. Bypass Handle and position indicators.

To Un–Bypass Normal Source*

(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 then turn it counterclockwise

until Bypass Switch Position shows OPEN (green indica-

tor). The Unit Not in Automatic light should be off.

Push in

Bypass

Handle

turn it

counter-

clockwise.

ATS

Bypass Switch

Figure 3–12. Un–Bypass Normal.

To Un–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 then turn it counterclock-

wise until Bypass Switch Position shows OPEN (green

indicator). The Unit Not in Automatic light should be off.

ATS

Bypass Switch

Pull out

Bypass

Handle

turn it

counter-

clockwise.

Figure 3–13. U n–Bypass Emergency.

The Automatic Closed–Transition Transfer & Bypass–Isolation Switch should be left in this position.

*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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