User manual

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BATT TIME 00: 01: 23
MODEL NAME 1
M 1
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NORMAL
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4.2V
RX TX
RX 05.2V
If the voltage falls below the warning threshold
(normally 3.8 V) which can be adjusted in the "RX
SERVO TEST" display of the "SETTING & DATA VIEW"
of the "Telemetry" menu, starting on page 124, a
visual and acoustic low-voltage warnings are generated.
The battery level should be checked
regularly. Do not wait to charge the battery
until the voltage decreases enough for a
warning signal to be generated.
Note:
A summary of the batteries, chargers and
measuring devices for checking the power
sources can be found in the main Graupner
FS catalogue as well as on the Internet at www.
graupner.de. A selection of suitable chargers is offered
in the table on page 16.
Receiver system power supply
NiMH battery packs with 4 cells
With a traditional 4-cell pack, you can reliably operate
your Graupner HoTT system providing that the above
conditions are observed, and assuming that the packs
have a suffi cient capacity and charge.
NiMH battery packs with 5 cells
Battery packs with fi ve cells offer greater leeway in
comparison to 4-cell packs.
You should note, however, that not every servo available
on the market can handle the voltage from a 5-cell pack
over the long term, especially when the pack is freshly
charged. Some of these servos audibly "growl" when
operated with a 5-pack.
You should therefore note the specifi cations
for your servo before you choose to use a
5-cell pack.
LiFe packs with 2 cells
Given the above considerations, these cells are the best
choice.
LiFe cells are also available in a hard plastic housing
to protect against mechanical damage. Like lithium
polymer cells, LiFe cells can be charged quickly with
suitable chargers and are comparably robust.
In addition, this type of cell can undergo signifi cantly
more charging/discharging cycles than conventional
LiPo batteries. The comparatively high rated voltage
of 6.6 V of two cell LiFe battery packs do not pose any
problems to Graupner HoTT receivers or the servos,
speed controllers, gyros, etc. which are approved for
operation with this higher voltage.
However, practically all of the previously
marketed servos, speed controllers, gyros,
etc. as well as many which are offered
today have a permissible operating voltage range of
4.8 to 6 V. Stabilized voltage control such as the PRX
(order No. 4136) is therefore needed to connect
them to the receiver. Otherwise, the connected
devices may quickly become damaged.
LiPo packs with 2 cells
LiPo batteries are lighter than NiMH batteries yet offer
the same capacity. LiPo batteries also come in a hard
plastic housing to protect against mechanical damage.
The comparatively high rated voltage of 7.4 V of two
cell LiPo battery packs do not pose any problems
to Graupner HoTT receivers or the servos, speed
controllers, gyros, etc. which are approved for operation
with this higher voltage.
However, practically all of the previously
marketed servos, speed controllers, gyros,
etc. as well as many which are offered
today have a permissible operating voltage range of
4.8 to 6 V. Stabilized voltage control such as the PRX
(order No. 4136) is therefore needed to connect
them to the receiver. Otherwise, the connected
devices may quickly be damaged.
Charging the receiver battery
The charging cable (order No. 3021) can be connected
directly to the receiver battery to charge it. If the battery
in the model is connected by a power supply cable
(order No. 3046, 3934, 3934.1 or 3934.3), the battery is
charged via the charging socket integrated in the switch,
or a separate charging connector. The switch for the
power supply cable must be set to "OFF" for charging
Polarity of the receiver
battery plug
.
36
Installation instructions - Receiver power supply
S1006_mz-24.3.en.indd 36 17.12.2014 15:21:23