User's Manual Part 2

Chapter 7: Peripheral Devices & Accessories
Powered Cradle Installation
272
Psion Teklogix 7535 Hand-Held Computer User Manual
7.11.6 Powered Cradle Installation
The powered cradle option is designed to allow the 7535 to be powered by a vehicle
battery. The battery installed in the 7535 is also recharged by the vehicle battery.
This option accepts DC power sources over the range 12V to 80V.
The 7535 picker cradle can be ordered with the powered cradle option installed, or it
can be retrofitted later at an authorized Psion Teklogix service depot. Service offices
are listed in Appendix A: Support Services And Worldwide Offices.
The 7535 charging LED (see Section 3.6.1.1 on page 43) indicates that external
power is available, and it also indicates the charging status of the internal battery.
Warning: Applying a voltage above 90VDC or reversing polarity may result
in permanent damage to the cradle power option and will void the
product warranty.
Warning: TO AVOID ELECTRIC SHOCK when the powered cradle option
is installed, alw
ays ensure that the rear panel ground lug on the
picker cradle is connected to the vehicle chassis. Failure to do this
could result in serious injury or death.
The metal chassis of the picker cradle must be connected directly to the chassis of
the vehicle. A safety ground lug (clearly labelled on the rear of the cradle chassis) is
provided for this purpose. The grounding strap must connect from the ground stud
on the picker cradle to a solid, reliable contact point on the main portion of the
vehicle chassis. It must not be connected to battery negative or a terminal block.
This grounding strap ensures that if there is a fault in the vehicle wiring or in the
picker cradle power module, the picker cradle cannot be at a hazardous voltage with
respect to the vehicle chassis.
Connection between the picker cradle ground lug and the vehicle chassis should be
done with a 16 gauge ground strap (ground wire). Connect the ground strap to the
picker cradle utilizing the ground lug hardware supplied with the picker cradle and a
#10 heavy duty wire crimp ring terminal. Torque the ground lug hardware to 23.0
+/- 2.0 in-lbs. Connect the other end of the ground strap to a solid, reliable point on
the main portion of the vehicle chassis, ensuring a solid electrical connection.
As with other vehicle cables, the routing of the ground strap should be carefully
considered to ensure it does not pose a hazard to the operator or the safe operation of
the vehicle. If necessary, secure the ground strap with cable ties or some other
mechanical means to prevent loops or loose lengths of wire that could catch on
stationary items when the vehicle is in motion.