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 Readers installed outside North America require a locally supplied transformer.
If 18V AC or 18V DC power is available, the transformer option is unnecessary.
TransCore offers a Class C transformer accessory kit (part number 76-1620-005) for sites where 110V AC
is available. It is the installer’s responsibility to supply conversion equipment and wiring for other voltages.
contains power supply current requirements.
Table 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
to determine the correct cable size according to the American Wire Gauge (AWG) standard for
the necessary length of extension cable. The numbers in the first row of the table indicate cable size for the
approximate cable length.
Note:
If the cable is close to the maximum length, measure voltage at the Encompass 4 Reader with
RF ON to ensure voltage does not drop below 16V. A drop in voltage below 16V causes a reduction
in read range and possible damage to internal electronics as well as unreliable operation.
Encompass 4 Reader System Guide
TransCore Proprietary.
2–16
Summary of Contents for encompass 4
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