Datacom Systems D56 Guide de dépannage télécharger pdf (Page 14)

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Section 3. INSTALLING REMOTE KEYPADS

This section lists the wired keypads that may be used and provides

instructions for wiring and mounting the keypads.

A preliminary check-out procedure is also provided to ensure that the

connected keypads are functioning properly in the system.

Keypads That May Be Used

• Fixed-Word Display: AM6128

• Alpha Display: AM6139

• Up to 8 keypads may be used in the system, independent of auxiliary

power considerations (you may need to use an auxiliary power supply if

the 600mA aux. output is exceeded)

If you are going to use a 4285 or 4286 Phone Module with this system, you

MUST use an addressable keypad (AM6128 or AM6139) set to the non-

addressable mode (address 31).

Wiring To The Keypads

1. Determine wire gauge by referring to the wiring length/gauge chart

below.

For devices (Keypads, RF Receivers, Zone Expander , etc.) connected to a

single 4-wire run, determine the current drawn by all units connected to

the single wire run, then refer to the Wiring Run chart to determine the

maximum wire length that can be safely used for each wire size. Current

draw for all devices can be found in the SPECIFICATIONS AND

ACCESSORIES section.

Note: Refer to “Auxiliary Device Current Draw Worksheet” in the

FINAL POWER UP section for current draw for all keypads.

Maximum wire lengths for any device that is wired to the control can also be

determined from the chart, based on the current draw of that device alone .

Wiring Run Chart For Devices* Drawing Aux Power From

The Control (+12V & –12V)

TOTAL CURRENT DRAWN BY ALL DEVICES CONNECTED TO A SINGLE WIRE RUN

Wire Size 50 mA or less 100 mA 300 mA 500 mA 600 mA

#22 500 ft (152m) 250 ft (76m) 80 ft (24m) 50 ft (15m) 42 ft (13m)

#20 750 ft (228.6m) 380 ft (116m) 130 ft (39.6m) 80 ft (24m) 67 ft (20.4m)

#18 1300 ft (396m) 650 ft (198m) 220 ft (67m) 130 ft (39.6m) 115 ft (35m)

#16 1500 ft (457m) 1000 ft (305m) 330 ft (100.5m) 200 ft (70m) 170 ft (52m)

* Includes Keypads, RF Receivers, Zone Expander/Relay Units, or 4285/4286 Phone Module.

The length of all wire runs must not exceed 1500 feet (457m) when unshielded

quad conductor cable is used (750 feet if shielded cable is used). This

restriction is due to the capacitive effect on the data lines when quad cable or

shielded cable is used.

2. Run field wiring from the control to the keypads (using standard 4-

conductor twisted wire cable using the wire gauge determined in step 1).

3. Connect remote Keypads to terminals 4, 5, 6, and 7 on the control board,

as shown in Figure 6.

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 103 104

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Datacom Systems D56 Guide de dépannage Page 14

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