Encompass 4 Reader System Guide
2-18
Electrical Power
A dedicated electrical power supply must be present at the site and available to the
Encompass 4 Reader at all times. The power must be 16-20V AC or 16-28V DC. A
step-down transformer is available (North America only) to convert a 120V AC
duplex wall outlet with ground to 18V AC, as is a step-up transformer to convert a
low-voltage 12V AC outlet to 18V AC. Consult your local and national electrical
codes for installation and safety requirements.
Note: Encompass 4 Re
aders installed outside North America require a locally sup-
plied transformer.
If 18V AC or 18V DC power is available, the transformer option is unneces
sary.
TransCore offers a Class C transformer acces
sory kit (part number 76-1620-005) for
sites where 110V AC is available. It is the installer’s responsibility to supply conver-
sion equipment and wiring for other voltages. Table 2-3 contains power supply current
requirements.
Table 2-3 Power Supply Requirements
Supply
(RF On)
a
Maximum Power at
68°F (20°C)
(RF Off)
a
Standby Operating
Power at 68°F (20°C)
16 to 20V AC 20 watts (W) 14 W
16 to 28V DC 20 W 14 W
a
1700 milliamp (mA) initial rush-in current at startup
Power circuits are protected internally against power surges.
Power Extension
Use Table 2-4 to determine the correct cable size acc
ording to the American Wire
58-1620-002 20-ft connector cable harness
58-1620-006 35-ft connector cable harness
58-1620-007 45-ft connector cable harness
20-1620-003 Connector kit only
56-1620-004 13-pair cable (sold by the foot)
76-1620-005 110V AC to 18V AC Class C transformer
76-1620-006 12V AC to 18V AC step-up transformer
Table 2-2 Connector Cabling Accessory Kits (continued)
Part Num
ber Description
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