User's Manual

ADCP-75-132 • Issue 2C • August 2006

Page 39

5. Connect the DC power cable to the DHU port 1 DC PWR jack as shown in Figure 22.

6. Place the DC power cable within the cable guides provided (see Figure 22) and then

dress and secure the cable at the DHU per standard industry practice.

17275-A

RJ-45 CONNECTOR

DETAIL

PORT 1

DC POWER

CONNECTOR

RJ-45

CONNECTOR

CABLE

GUIDES

CABLE GUIDE

DETAIL

Figure 22. 48 VDC Power Cable Connection

7. Connect the DC power cable to the DRU as specified in the instructions provided with

that unit.

8. Repeat steps 1–7 for each remaining DRU that will be powered by the DHU.

4.11 External Alarm System Connections

The alarm interface between the DHU and an external alarm system is supported by a six-

terminal plug (with screw-type terminals) that connects to a receptacle mounted on the DHU

front panel. The terminal plug provides connections to normally open (NO) and normally

closed (NC) dry type alarm contacts for both minor and major alarms. A category 3 or 5 cable

is typically used to connect the DHU to the external alarm system. Use the following

procedure to install the alarm wiring and connect it to the DHU:

1. Obtain the required length of category 3 or 5 cable.

2. Route the cable between the DHU and the external alarm system (if not already routed)

and then cut to required length. Allow sufficient slack for dressing and organizing the

cable at the DHU.