Emerson 7ADTB Manual del operador descargar pdf (Pagina 6)

INSTALLATION (continued)

1 --- 2

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

generator 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 ADTB

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

defectiveorhavebeendamagedduringinstallation.

Protect the switch from construction grit

and metal chips to prevent malfunction or

shortened l ife of the ADTB switch.

Connecting Power Conduc tors

A Wiring Diagram is furnished with the ADTB. All

wiring must be made in accordance with the local

codes. After the power cables have been tested,

connect them to the appropriate terminal lugs o n the

Bypass Switch as shown on the wiring diagram

provided with this ADTB. Make sure that the lugs

providedaresuitableforusewiththecablesbeing

installed. Standard terminal lugs are solderless screw

type and will accept the wire sizes listed on the

drawings provided with the ADTB. Be careful when

stripping insulation from conductors; avoid nicking or

ringing the conductor. Remove surface oxides from

conductors by cleaning with a wire brush. Follow

conductor manufacturer’s instructions when aluminum

conductor is used. Apply joint compound to conductor,

then carefully wipe away excess compound. Tighten

the cable lugs to the torque specified on the rating

label.

Be sure that the Normal and Emergency power

connections are in proper phase rotation.

Bus Connections

If bus connectio n is used, use SAE grade 5 hardware to

connect bus to appropriate terminal plates on bypass

switching device. Wipe off bus surfaces before they are

joined. If bus is dirty, gently clean surfaces with a

non-flammable solvent. Avoid touching cleaned

surfaces.

Do not breathe cleaning solvent vapors.

UseSAEgrade5hardwareandtightentheboltedjoints

tothetorquespecifiedinTable2-1.

The reliability o f the connection d epends

on how clean and how tight the joint is.

Table 2-1. Tightening torque values for bolted joints.

Bolt D iameter

(Grade 5 hardware)

in inches

Recommended

Tightening Torque

in foot pounds

5/16 12

3/8 20

1/2 50

5/8 95

Harnesses

All internal connections are made at the factory. The

bypass switch, transfer switch, and control panel are

joined together by an interconnecting wire harness.

The disconnect plugs are already engaged on enclosed

switches. For open–type switches, the plugs must be

engaged after installation is completed. Align harness

plugs with sockets in the control and push them

together until they are secure.

Controller Ground

A grounding wire must be connected to the controller’s

lower left mounti ng stud. Because the controller is

mounted on the enclosure door, a conductive strap

must be used between the enclosure and the door.

This connection provides proper grounding which doe s

not rely upon the door hinges.

Engine Starting Contacts

and Auxiliary Circuits

The engine control contact si gnal connections and

auxiliary circuits are located on terminal block TB as

shownontheWirin g Diagram provided with the ADTB.

Connect the signal wires to the appropria te terminals.

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Emerson 7ADTB Manual del operador Pagina 6

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