Psion 8585, User Manual

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Psion 8585/8595 Vehicle-Mount Computers User Manual
Chapter 4: Installing The Computer
Vehicle Applications (such as forklifts)
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4.6 Vehicle Applications (such as forklifts)
4.6.1 Electrical Installation
Pay special attention to the various electrical potentials when installing the unit on a vehicle (such as a
forklift).
In the 8585, the logic ground and the shield ground are firmly linked.
The “logic ground” is the earth line (GND) for all of the internal electrical components, such as the display
and the CPU.
The cable shielding and the housing are connected to the “shield ground”.
Figure 4.1 Position of the ground bolt
• The other end of the white supply voltage cable should be connected to the vehicle's chassis.
• Make sure that the 8585's connecting cable is attached as close to the battery as possible. Connecting
the 8585 to large electrical loads, such as converters for the forklift motor may result in random
restarts, malfunctions and/or irreparable damage to the device.
• If you want to connect devices fed by other power sources to the 8585, such as printers and so on, be
sure to power up the peripheral devices at the same time or after the 8585. Otherwise, you may
encounter start-up problems, malfunctions or even irreparable damage to the device.
4.6.1.1 Wiring Vehicle Power to the 8585/8595
Caution:
Property
Damage Pay attention to the following warnings!
Some forklifts have a chassis that is connected to DC+. Therefore, the 8585
chassis is also connected to DC+. However, if you use peripheral devices that
supply DC– to the 8585 via an interconnector (such as a DC– serial port), this will
cause a short circuit. This will inevitably lead to malfunctions or even a total
system failure.
Always attach the ring tongue on the white supply voltage cable to the ground
bolt situated on the connector bay.
Most electrically-driven forklift vehicles have floating chassis, connected to
neither DC+ or DC-. However, electrical faults can cause the b or - to be
connected to the chassis via low resistance paths. All connected peripherals must
be completely isolated.
Ground bolt
Warning: Applying a voltage above the input voltage rating or reversing polarity may result
in permanent damage to the 8585/8595 and will void the product warranty.