Installation & Operation Manual

Wilat_Op_Man_23Oct08.doc CONFIDENTIAL
Aearo Technologies Page 17 of 21 18/07/2007
6. WRU Power management
The WRU is powered by a Li-Ion rechargeable battery. When the battery is fully charged, the
WRU will operate for approximately 10 hours of testing. The WRU should be charged over night
in preparation for the next day’s testing.
Caution: Only the charger provided with the WiLAT system (or a specified replacement
available through an authorized distributor) should be used to charge the WRU
Li-Ion battery in accordance with the instructions contained in this manual. To
prevent personal injury, do not open, dispose of in fire, or short-circuit the
battery.
When the WRU is turned ON, it provides an initial indication of the battery charge. (See lines 4.1
and 4.2 of Section 2.4, Installing the WRU)
Note: If the WRU LEDs do not flash after turning the unit on, its battery needs to be fully charged
before conducting any testing. See Section 3 below.
During testing, a low battery condition will be indicated on the WBU and the WRU:
1. Low Battery condition – indicates approximately 30 minutes of operation available:
1.1. WBU indicators: the LOW BAT.LED (11) on the WBU will flash and the WBU will
produce 6 long alert beeps. Thereafter, the LOW BAT LED will continue to flash.
1.2. WRU indicator: The orange LED (23) will glow steadily.
2. Expended battery condition – the WRU will enter a power down mode in 60 seconds:
2.1. WBU indicators: the LOW BAT. LED (11) on the WBU will flash rapidly and the WBU will
produce 30 fast alert beeps (≈15 seconds). Thereafter, the LOW BAT LED will continue
to flash while the WRU is still on and will turn off when the WRU enters a power down
mode.
2.2. WRU indicator: Approximately one minute after detecting an “expended battery”
condition, the WRU will enter a power down mode and its LOW BAT LED (23) will flash
approximately every 7 seconds.
Note: If the WRU remains on in its power down mode without recharging, the battery will shut
down to protect it from excessive discharge, and the LOW BAT LED (23) will go out.
3. To charge the WRU:
3.1. Plug the charger into the wall outlet. A GREEN LED on the charger will glow.
3.2. Insert the barrel-type plug into the charger jack (26).
3.3. Allow the WRU to charge overnight for normal use.
Note: A partial charge will not harm the battery. If the WRU rechargeable battery becomes
discharged during testing, perform an abbreviated charging cycle. The WRU will cease to
operate when it is connected to the charger.