AKG Acoustics WMS 40 - Manual (Page 58)

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AKG WMS CU 4000
The CU 4000 Charging Unit revolutionizes bat-
tery management for wireless systems. The
heart of the charging system is the BP 4000
Battery Pack with built-in active monitoring. An
integrated microprocessor continuously moni-
tors battery status and accurately calculates
the remaining battery life. In conjunction with
a WMS 4000 wireless transmitter, these data
are not only indicated on the transmitter dis-
play but are also transmitted to the receiver via
pilot tone. The transmitter’s remaining battery
life can thus be read out on the receiver within
a few minutes’ accuracy, putting an end to the
nightmare of batteries failing in the middle of
a performance. A processor-controlled pulse charging system
charges the battery pack quickly yet gently,
while the integrated “Charge Balance
Management” feature makes sure that only as
much energy is fed to the battery pack as had
previously been drawn from it. In addition,
several monitoring circuits and a temperature
sensor prevent the battery pack from being
overcharged.
A self-discharge counter does not only measure
battery discharge during operation but also
determines the amount of discharge after pro-
longed storage periods. As charging begins, the
BP 4000 circuitry communicates with the
CU 4000 charging unit in order to “tailor” the
charging process optimally to the status of the
battery pack. To eliminate memory effect, the
CU 4000 automatically checks whether the
batteries need a recovery cycle, and automati-
cally starts the cycle upon confirmation by the
user. The charging unit provides two charging
compartments that allow you to charge two
transmitters (HT 4000, PT 4000) or two bat-
tery packs at the same time.
The combined BP 4000 plus CU 4000 system
is an investment that will quickly help cut
expenses and reduce environmental hazards
from used batteries.
T
HE INTELLIGENT
W
AY TO POWER
WMS 4000 T
RANSMITTERS
AKG WMS 4000 CHARGING SYSTEM
CU 4000 Charging unit
Charging status display (LED)
Recovery key and LED
Starts a battery recovery cycle. SBMS detects the
battery status and suggests starting a recovery
cycle to prolong battery life.
2 universal charging compartments
Each compoartment accepts an HT 4000,
PT 4000, or BP 4000 battery pack.
Lockable DC jack
For connecting a local or central power supply unit
such as a PSU 4000.
BATTERY CARE
Rechargeable batteries are known to suffer from the so-called
“memory effect”. The capacity of a rechargeable battery will
decrease over time if it is not fully discharged. If a battery is
discharged only to 50% of its capacity over many charging cycles,
it will finally "believe" its capacity to be only 50%, so that it can-
not be charged fully any more. To eliminate memory effect, we
recommend completely discharging and recharging the battery
pack periodically (recovery cycle). SBMS permanently monitors
battery parameters and detects the need for a recovery cycle. The Recover LED illuminates to indicate it is time for servicing the
battery pack. Since a recovery cycle may take 14 hours, the best
time to run it is during the night. In any case you will need to start
the recovery cycle manually. If you service your battery pack regu-
larly it will retain its maximum capacity throughout its useful life.