Intermec Janus 2050, User Manual

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39
nugget
A Operating the JANUS 2050
2-21
2
Estimating Power Usage
You can use the following information as a guideline for estimating typical
power usage.
Internal combustion vehicles A typical battery has a capacity of 60 Amp-
hours (Ah). The JANUS 2050 typically draws 1.8A at 12V. To find the length of
time the JANUS 2050 can operate before recharging the vehicle battery, divide
the capacity of your battery by the amount of power drawn hourly. Your
calculation should be similar to the following:
60Ah/1.8A = 33.3 hours or 1.4 days
If you start with a fully charged battery, the JANUS 2050 can operate for 33.3
hours or approximately 1.4 days before draining the vehicle battery.
Electric vehicles Electric vehicles have higher capacity batteries than internal
combustion vehicles. The standard electric vehicle battery is so large that
leaving the JANUS 2050 powered on for long periods of time has no noticeable
effect on the vehicle battery.
Recharging the Backup Battery
The JANUS 2050 is normally powered by the batteries of the vehicle to which it
is attached. The internal NiCad battery supplies power to the real-time clock
and processor RAM when you remove or discharge the vehicle. The NiCad
battery must be replaced by an Intermec service technician.
If you turn on the JANUS 2050 when the battery charge is low, the JANUS 2050
beeps and displays a “Backup Battery Low” message. You should recharge the
battery immediately.
To recharge the backup battery
1. Press the
q
button to suspend the JANUS 2050 while input power is
connected and the rear power switch is in the ON position.
2. The backup battery will charge enough to operate the unit normally on an
external power supply within 20 minutes. To be fully functional, the
backup battery should charge for approximately 10 hours.
Note: If you continue to operate the JANUS 2050 without charging the backup
battery, the JANUS 2050 beeps every 15 seconds for 1 minute and then turns off.