Installation guide

Wiring the Alarm Contact

The Alarm Contact consists of the two middle contacts of the terminal block on

EDS’s top panel. You may refer to the next section for detailed instructions on

how to connect the wires to the terminal block connector, and how to attach the

terminal block connector to the terminal block receptor.

In this section, we will explain the meaning of the two contacts used to connect

the Alarm Contact.

FAULT: The two middle contacts of the

6-contact terminal block connector are used to

detect both power faults and port faults. The two

wires attached to the Fault contacts form an open

circuit when:

1. EDS has lost power from one of the DC

power inputs.

2. One of the ports for which the corresponding

PORT ALARM Dip Switch is set to ON is not

properly connected.

If neither both of these two conditions occur, the

Fault circuit will be closed.

Wiring the Redundant Power Inputs

The top two contacts and the bottom two contacts of the 6-contact terminal

block connector on EDS’s top panel are used for EDS’s two DC inputs. Top

and front views of one of the terminal block connectors are shown here.

STEP 1: Insert the negative/positive DC wires

into the V-/V+ terminals.

STEP 2: To keep the DC wires from pulling

loose, use a small flat-blade screwdriver to

tighten the wire-clamp screws on the front of the

terminal block connector.

STEP 3: Insert the plastic terminal block

connector prongs into the terminal block receptor,

which is located on EDS’s top panel.

Before connecting EDS to the DC power inputs, make sure the

DC power source voltage is stable.

— 7 —