Digital Monitoring Products XR20 Installation Guide download pdf (Page 10)

Installation

XRSuper6/XR20/XR40 Installation Guide

Digital Monitoring Products www.dmpnet.com 2500 N. Partnership Boulevard Springfield, MO 65803

4.2 Mounting keypads

Security Command keypads have removable covers that allow you to easily mount the base to a wall or other flat

surface using the screw holes provided on each corner.

For mounting keypads on solid walls, or for applications where conduit is required, use a DMP 695, 696, 775, or

776 keypad conduit backbox.

4.3 Wiring keypads

Keypad data bus

The keypad data bus consists of a 4-wire cable that provides 12 VDC power, data in, data out, and a panel

common. You can connect keypads in parallel on one 4-wire cable or provide a separate cable run back to the

panel for each keypad.

Three factors determine the performance characteristics of the keypad bus: the length of wire used, the number

of devices connected, and the voltage at each device. You can connect devices in parallel on the same cable, or

provide separate runs back to the panel.

When planning a keypad bus installation, keep in mind the following three specifications:

1. Maximum distance for any one keypad bus circuit (length of wire) is 2,500 feet.

2. Maximum number of devices per 2,500 feet circuit is 40. This number can be increased to 50 if the wire

run remains less than 2,000 feet.

3. Maximum voltage drop between the panel (or auxiliary power supply) and any device is 2.0 VDC. For

example, if the voltage across the red and black wires at the panel is 13.8 VDC, the voltage measured at each

device on the circuit must be equal to or greater than 11.8 VDC.

If the voltage at any device, including a 710 module, is less than the required level, an auxiliary power supply

should be added at the end of the circuit. The voltage drop can be reduced by increasing the gauge of wire used

on the circuit. The 2.0 VDC rule applies to keypad data bus circuits powered either by the panel or by an

auxiliary power supply.

Note: To troubleshoot voltage drop, read the voltage of the last device on the keypad bus.

Refer to the 710 Bus Splitter/Repeater Installation Sheet, LT-0310 (Document No. 0310 on DMP Fax) for

information concerning keypad wiring distances and capacities.

Primary Power Supply

5.1 AC terminals 1 and 2

Connect the transformer wires to terminals 1 and 2 on the panel. Use no more than 70 ft. of 16 gauge, or 40

ft. of 18 gauge, wire between the transformer and the panel.

Always ground the panel before applying power to any devices: The panel must be properly grounded before

connecting any devices or applying power to the panel. Proper grounding protects against Electrostatic

Discharge (ESD) that can damage system components. See Earth ground, in the Secondary Power Supply

section.

5.2 Transformer types

The larger transformer for the panel is 16.5 VAC 40VA, which provides up to 1.5 Amps of bell output current,

500mA of auxiliary current, and 100mA of smoke detector output. You can use either the Model 320 wire-in or

321 plug-in transformer with the panel. The total current available is limited by the total battery standby

requirements of the installation. When the DMP Model 324 16.5 VAC 20VA plug-in transformer is used, the bell

output current is reduced to 600mA.

The transformer must be connected to a 120 VAC 60 Hz commercial power outlet that is not controlled by a wall

switch. Never share the transformer output with any other equipment.

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Digital Monitoring Products XR20 Installation Guide Page 10

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