Emerson 7ADTB Manuel de l'opérateur télécharger pdf (Page 9)

TESTING & SERVICE

(continued)

2 --- 3

handle

shaft

frame

UP opens the

Emergency source

contacts

DOWN closes the

Emergency source

contacts

UPPER SHAFT

Figure 2–2. Maintenance handle operation for Emergency source contacts (upper shaft).

handle

shaft

frame

UP closes the

Normal source

contacts

DOWN opens the

Normal source

contacts

LOWER SHAFT

Figure 2–3. Maintenance handle operation for Normal source contacts (lower shaft).

Table C. Maintenance handle positions.

Transfer Switch Position

Interlocked Weights

Lobes prevent closing

both N & E contacts

Maintenance Handle Shaft Indicators

weight shaft

E=O

upper contacts open

orma

weight

shaft

N=C

lower contacts closed

Load

E=O

upper contacts open

Disconnected

down

N=O

lower contacts open

down

E=C

upper contacts closed

mergency

down

N=O

lower contacts open

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Operator’s 1
Phase Poles 2
SECTION 1 INSTALLATION 3
INSTALLATION (continued) 4
Functional Test 4
INSTALLATION 5
In the United States 7
In Canada 7
TESTING & SERVICE 8
BYPASSING THE ATS* 10
BYPASSING & ISOLATING 11
Printed in U.S.A 17

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Emerson 7ADTB Manuel de l'opérateur Page 9

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