GRAUPNER mx-20 Hott, Programming Manual

Page: 16 / 296

16 Operating notices
Receiver power supply
A selection of 4 and 5 cell NiMH battery packs having
different capacities are available to power the receiver. If
digital servos are in use, we recommend a 5 cell battery
pack (6 V) to afford adequate battery capacity. If analog
and digital servos are used in mixed operation, be sure
to pay attention to the given maximum permissible
operating voltage. A stabilized, adjustable power
supply for the receiver with 1 or 2 receiver batteries
can be provided, e. g. the PRX-unit, order no.
4136 , see
appendix.
For reasons of safety, do not use battery boxes or dry
cell batteries.
The voltage of the on-board power supply will be
displayed at the bottom right of the transmitter's screen
while the model is in operation.
GRAUBELE
#01
2:22h
Stop
Flt
«nor mal »
K78
0:00
0:00
5.5V
5.2V
M
HoTT
If the adjustable warning threshold (default value 3.8 V)
set in the Telemetry menu, see page 217, is underrun,
an optical and acoustic under-voltage warning will be
issued.
Despite this feature, be sure to check the condition
of the battery at regular intervals. Do not wait for the
warning to be issued before recharging the battery.
Notice:
An overview of available batteries, chargers and current
source test instruments can be found in the Graupner
RC main catalog or in Internet at www.graupner.de.
Charging the receiver battery
Charger cable, order no. 3021 , can be plugged directly
onto the receiver's battery for charging. If the battery in
the model is connected by way of an order no.
3046 ,
3934 , 3934.1 or 3934.3 power supply cable, then
charging can be accomplished via the charging jack or
special charging connector integrated into the switch.
The switch in the power supply cable must be in its
"OFF" position for charging.
Receiver battery connection polarity
General charging notices
The charging instructions for the charger as well as •
for the battery from its manufacturer to be observed.
Pay attention to the maximum permissible charging
•
current specifi ed by the battery's manufacturer. In
order to prevent damage to the transmitter, charging
current should never exceed 1 A. If necessary, limit
the current at the charger.
If the transmitter battery is nevertheless to be
•
charged at a current rate in excess of 1 A, then
it is imperative that this is done outside the
transmitter. Otherwise there is a risk of damage to
the transmitter's board due to overloading its printed
circuit paths and/or overheating of the battery.
If an automatic charger is to be used for charging,
•
perform several test charging procedures to ensure
the fl awless functionality of its automatic shut-off.
This applies particularly if you want to charge the
standard installed NiMH battery with an automatic
charger unit intended for NiCd batteries Monitor the
charger's shut-off behavior if it has that option.
Do not execute a battery discharge or battery •
maintenance program through the charger jack. The
charger jack is not suitable for this purpose.
Alway connect the charger cable to the charger fi rst
•
and then to the receiver or transmitter battery. This
avoids the possibility of shorting the bare banana
plug ends together.
If the battery heats up signifi cantly, check the
•
battery's condition, replace the battery or reduce the
charging current.
Never leave a charging battery unattended. •
Follow the safety notices and handling •
instructions provided on page 8.
Operating notices