Emerson 7000 SERIES ATB Installation, Remove the Transfer Switch, Supporting Foundation, Mounting

SECTION 1 INSTALLATION

The ASCO 7000 Series Automatic Transfer & Bypass– Isolation Switch (ATB) consists of an upper bypass–isola- tion switch, a transfer switch, a monitoring and transfer controller, and door–mounted controls. The ATB is factory wired and tested. Installation requires removal of the shipping skid then securing the enclosure to the supporting foundation.

Remove the Transfer Switch

The Transfer Switch is shipped inside the enclosure (ATS side) in the fully engaged position. Before installing the enclosure remove the Transfer Switch as follows:

1.Open the enclosure doors and install the two ramps (stored on right side).

2.Remove the Isolation Handle which is stored on the lower right front of the Transfer Switch carriage frame. Install the Isolation Handle onto the protruding shaft and turn it counterclockwise (approximately 10 turns) until it stops.

3.Unplug J2 and J5 harness plugs, and roll out the Transfer Switch. Cover it to keep it clean.

Supporting Foundation

The supporting foundation and adjacent area must be level and straight, otherwise the Transfer Switch and enclosure may not align causing door problems. The floor under the enclosure must be flat and level. This is very important! The structure of the enclosure must be straight and square. Allow at least 36 inches for roll out of Transfer Switch. Refer to the enclosure drawing for required door opening space.

If bottom cable entry is used, the foundation must be pre- pared so that conduit stubs are located correctly. Refer to appropriate enclosure outline drawing for specified cable entrance area and location. Provide cable bending space and clearance to live metal parts. When a concrete floor is poured, use interlocking conduit spacer caps or a wood or metal template to maintain proper conduit alignment.

Mounting

Refer to the enclosure outline drawing furnished with this switch and mount the 7000 Series ATB according to the details and instructions shown on the drawing.

Bolt the cubicle sections together so that they are lined up on the front faces. See Figure 1–1.

De–energize the conductors before making any line or auxiliary circuitry connections. Be sure that Normal and Emergency line connections are in proper phase rotation. Place engine gen- erator starting control in the OFF position. Make sure engine generator is not in operation.

Testing Power Conductors

Do not connect the power conductors to the ATB until they are tested. Installing power cables in conduit, cable troughs, and ceiling-suspended hangers often requires considerable force. The pulling of cables can damage insulation and stretch or break the conductor’s strands. For this reason, after the cables are pulled into position, and before they are connected they should be tested to verify that they are not defective or have been damaged during installation.

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Protect the switch from construction grit and metal chips to prevent malfunction or shortened life for the ATB switch.

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