Varec 4000 Grounding the Equipment, ATT Wiring, Wiring Preparation, Connecting Input Power

4000 Installation

2.3Grounding the Equipment

Warning! The ATT must be grounded before communication and power connections are made.

An external grounding lug is provided on the ATT. A connection from the ground lug to earth ground must be made before any other wiring connections are made.

Note! For adequate/proper operation of the ATT lightning arrestor, a ground strap must be attached to the ATT. Grounding through mounting kits or pipe coupling is not adequate.

Note! Properly seal all ports to prevent moisture or other contamination from entering the wiring compartment.

2.4Wiring

Connections should be made in a conventional manner according to local or plant electric codes.

Warning! Explosion-proof seals must be installed in all wiring entries. Any unused entries must be plugged with pipe plugs and secured with Loctite®, or equivalent.

2.4.1ATT Wiring

Wiring the ATT is described in the following paragraphs. The wiring diagram provided in Figure 2-3 on page 6 should be used in conjunction with these wiring instructions.

2.4.2Wiring Preparation

Remove the two thread protectors from the 1/2-inch NPT conduit entries at the top and bottom of the ATT. Remove the rear cover from the ATT housing.

2.4.3Connecting Input Power

Warning! When connecting DC power leads to the ATT, make certain that power is OFF.

The ATT operates on a 24-48 volts DC power source. The input power connection to the ATT is accomplished in the following manner.

Connect the positive side of the power supply to terminal 10, B+, and the negative side to terminal 9, B-, of the terminal block assembly. See Figure 2-3 on page 6.

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