Reference Manual

113501
18
For an AC power supply the output voltage must be between 8V and
20V AC. The recommended power range is 12V to 18V AC. Output
power rating should be no less than 14VA AC.
The suitability of the power supply output can also be determined with
an output current rating of 1A minimum at 12V, or a current rating of
1.5A minimum below 12V.
Example:
The output current of the transformer must be capable of no less than
1000mA for a 12V AC/DC linear supply.
9.1.2 Backup Battery
A 6V backup battery, usually a lead acid gel cell, can be connected
directly to the backup battery terminals. An inline, slow-acting fuse of 3
Amps rating is highly recommended. The battery is charged at 180mA
until fully charged and then will continue to be trickle charged. The
battery supplies power to the i-PORT when the input power drops
below the battery terminal voltage.
10 LCD Option
The LCD is a factory-installed touch screen to allow data input and
systems functions to be controlled directly at the i-PORT. The LCD
replaces the clear glass panel on the front of the i-PORT and is
connected to the computer board with a flex cable. The LCD screen
provides the following features:
•
480 X 320 VGA resolution
•
Monochrome, 4 shades of gray
•
Permanent electro luminescent backlight
•
Auto temperature sensing heater to extend useful range
•
Auto temperature compensating contrast
•
Protective film overlays available
11 Installation and Wiring Procedure
This chapter describes the installation and wiring procedure for an i-
PORT in a fixed location. If installing the i-PORT on mobile
equipment, such as a forklift, see the IDENTEC bulletin
Using the i-
PORT as a Mobile Interrogator
.