Instruction manual

DLP-12 Connecting to the ATLAS 890 External Input

Introduction

This DLP explains how to connect other equipment to the external input on the ATLAS 890. The external

input connector can sense a relay closure or the presence of -48 VDC.

Prerequisite Procedures

Before making this connection, the unit should be mounted in its permanent location.

Tools and Materials Required

• Wire strippers

• Small, straight slot screwdriver

• 22 or 24 AWG 2-conductor twisted pair cross connect wire

Connecting the External Input

1. To sense the relay closure, connect VOUT (-48VDC limited to 1 mA) to the COM of the relay to be

monitored (see Figure 3 on page 348). Connect INPUT to the normally open (NO) contact of the

device to detect when the relay is energized or the normally closed (NC) to detect when the relay is

de-energized (see Table 2).

2. To sense the presence of -48 VDC, connect INPUT to the source to be sensed.

To prevent electrical shock, do not install equipment in a wet location or during a

lightning storm.

Electronic modules can be damaged by static electrical discharge. Before handling modules,

wear an antistatic discharge wrist strap to prevent damage to electronic components. Place

modules in antistatic packing material when transporting or storing. When working on

modules, always place them on an approved antistatic mat that is electrically grounded.