Emerson THROUGH 1200 manual Manual Operation Test, ATS Position Handle Indicators

INSTALLATION (continued)

1 – Manual Operation Test

A detachable maintenance handle is provided on the frame of the Transfer Switch for maintenance purposes only. Manual operation of the transfer switch should be checked before it is energized (operated electrically).

!

Do not manually operate the transfer switch until both power sources are disconnected: open both circuit breakers.

1.After deenergizing both power sources, open the enclosure door. Locate and remove the maintenance handle from the clips on the left side of the transfer switch frame. Insert the handle into the hole in the molded hub on the left side of the operator. See Figures 1–3 through 1–5 and Table B.

2.Move the maintenance handle up or down as shown to manually operate the transfer switch. The transfer switch should operate smoothly without binding. If it does not, check for shipping damage or construction debris. Operate both upper and lower contact shafts.

3.Return the transfer switch to the Normal position. Observe that the window indicators (right side) show the upper shaft O (Emergency open) and the lower shaft C (Normal closed). Remove the maintenance handle and store it on the frame in the clips provided.

Table B. Maintenance handle positions.

ATS Position		Handle	Indicators
		up
	E		E = O
			upper contacts open
Normal
		up	N = C
	N
			lower contacts closed
	E		E = C
		down	upper contacts closed
Emergency
	N		N = O
			lower contacts open
		down

Note: If Normal and Emergency connections are

reversed this operation is also reversed.

Now continue to 2 – Voltage Checks on the next page.

left side of

transfer switch

Emergency source contact shaft hub

maintenance

handle

clip

Normal source

contact shaft hub

Figure 1-3. Maintenance handle storage location. Hubs shown with Normal closed & Emergency open.

handle	UP opens the
	Emergency source
	contacts
	UPPER SHAFT

hub

DOWN closes the Emergency source contacts

frame

Figure 1-4. Emergency (upper shaft) operation.

handle	UP closes the
	Normal source
	contacts
hub	LOWER SHAFT
	DOWN opens the
	Normal source
frame	contacts

Figure 1-5. Normal (lower shaft) operation.

1---3