AWID LR-2000 Specifications download pdf (Page 17)

LR-2000 Manual V1.4 Page 17 of 20

11.4 POWER SUPPLY

 Use an independent power supply, not connected in any way to the controller panel or other system components.

 Do not connect other readers and other devices to the LR-2000 reader’s power supply.

• Connect only a single LR-2000 reader to a power supply, and no other electrical load – not even a small proximity reader.

• Have a different power supply for each LR-2000 reader.

• Multiple readers may connect to a single power source if the DC outputs are isolated electrically from each other.

 Check the power supply’s specifications.

• A separate DC power supply for every reader. Black and red wires connected only to this one power supply.

• Voltage = between 7 volts and 15 volts DC (commonly 12.0 to 13.8 volts).

• Current rating for a nominal 12 volt supply = at least 1.5 amperes for each LR-2000 reader.

• AWID’s PS12-3.3A plug-in power module (in the LR-2000KIT) is suitable for a single LR-2000 reader.

• For Altronix power supplies, select “Linear” rating and minimum current rating of 2.5 amperes. Model LPS3 is good.

 Calculate voltage drop between the power supply and the reader.

• Measure voltage at the power supply with nothing connected to the supply.

• Then measure voltage at the reader-end of the power cable before the reader is connected.

• Then measure voltage at the reader when it is connected to the power supply (black and red wires).

• Voltage drop is a combination of power supply regulation, and voltage drop in the cable. This should not exceed

a few tenths of a volt. Check the reader’s current draw, and the cable’s wire gauge, and the power supply’s current rating.

 Measure DC current in the reader’s red wire.

• Set the multimeter’s function to DC Amperes, and the range to 2 A or 5 A.

• Disconnect the reader’s red wire from the power cable.

• Insert the multimeter’s leads in series – positive lead toward the power supply, and negative lead toward the reader.

• With voltage restored to the reader, its current is typically about 450 milliamperes in standby (no tag present),

and about 900 milliamperes when the reader is processing a tag’s code.

 To evaluate the reader’s DC power supply and the power cable, substitute a back-up battery in place of the power supply.

• Disconnect the reader from the independent DC power supply and the power cable.

• Replace the power supply temporarily with a back-up battery (typically 12 volts, 7.5 ampere-hours, fully charged).

This will power the LR-2000 reader for a working day. Alternative: Connect long clip leads to your truck’s battery.

• A charged battery has perfect DC voltage quality and plenty of current rating.

11.5 CABLE

 Check the specifications of the cable between reader and panel, and between reader and power supply. They should be –

• Stranded wires, color-coded insulation, overall 100% shielded, outside plastic sheath, high quality.

• For power: 18 gauge wires, 2 conductors, twisted-pair is OK.

• For data: 22 gauge wires, 3 conductors, not twisted-pair.

• For power and data in same cable: 18 gauge, 5 conductors, not twisted-pair.

• Maximum length for Wiegand interface (using the reader’s Data-0 and Data-1 lines) is 500 feet. For longer cable runs,

use a Wiegand extender or a wireless transmitter. See Cypress Computer Systems’ Web site, www.cypressworld.com

• Maximum length for RS-232 serial interface is 75 feet at 9,600 bits per second. 500 feet is possible in special cases.

 If existing cable is twisted-pair (rather than “bunched” wires), run Data-0 and Data-1 through different twisted pairs.

• Example: Run Data-0 and DC power positive in one twisted pair, and run Data-1 and DC power negative in another pair.

 Check the cable’s junctions and splices.

• Be certain that they are solid, clean, dry, insulated, shielded and tested.

• Do not let the cable shield touch metal conduit. Check metal conduit’s ground. Check for water inside conduit.

 If a cable problem is suspected, disconnect that cable, and run a temporary cable on the surface.

• If the reader now works normally, pull new cable through the conduit, with no splices or junctions.

 If existing power cable has 22 gauge wires, connect spare wires in parallel for both DC positive and DC negative.

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AWID LR-2000 Specifications Page 17

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