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6
Safety Notes
Checking the transmitter and receiver batteries
It is essential to stop using the radio control system and
recharge the batteries well before they are completely
discharged. In the case of the transmitter this means –
at the very latest – when the message “battery needs
charging appears on the screen, and you hear an
audible warning signal.
It is vital to check the state of the batteries at regular
intervals – especially the receiver pack. When the bat-
tery is almost flat you may notice the servos running
more slowly, but it is by no means safe to keep flying or
running your model until this happens. Always replace or
recharge the batteries in good time.
Keep to the battery manufacturer’s instructions, and
don’t leave the batteries on charge for longer than
stated. Do not leave batteries on charge unsupervised.
Never attempt to recharge dry cells, as they may ex-
plode.
Rechargeable batteries should always be recharged be-
fore every session. When charging batteries it is impor-
tant to avoid short-circuits. Do this by first connecting the
banana plugs on the charge lead to the charger, taking
care to maintain correct polarity. Only then connect the
charge lead to the transmitter or receiver battery.
Disconnect all batteries and remove them from your
model if you know you will not be using it in the near
future.
Capacity and operating times
This rule applies to all battery types: capacity diminishes
with each charge. At low temperatures the battery’s
internal resistance rises, and capacity falls. This means
that its ability to deliver current and maintain voltage is
reduced.
Frequent charging, and / or the use of maintenance
programs, tends to cause a gradual reduction in battery
capacity. We recommend that you check the capacity of
all your rechargeable batteries at least every six months,
and replace them if their performance has fallen off
significantly.
Use only genuine Graupner rechargeable batteries!
Suppressing electric motors
All conventional (brushed) electric motors generate
sparks between the commutator and the brushes, which
cause more or less serious interference to the radio
control system, depending on the type of motor. If an
RC system is to work correctly, it is therefore important
to suppress the electric motors, and in electric-powered
models it is essential that every motor should be effec-
tively suppressed. Suppressor filters reliably eliminate
such interference, and should always be fitted where
possible.
Please read the notes and recommendations supplied
by the motor manufacturer.
Refer to the main Graupner FS catalogue or the Internet
website at www.graupner.de for more information on
suppressor filters.
Servo suppressor filter for extension leads
Order No. 1040
Servo suppressor filters are required if you are obliged
to use long servo extension leads, as they eliminate the
danger of de-tuning the receiver. The filter is connected
directly to the receiver input. In very difficult cases a
second filter can be used, positioned close to the servo.
Using electronic speed controllers
The basic rule is that the electronic speed controller
must be chosen to suit the size of the electric motor it is
required to control.
There is always a danger of overloading and possibly
damaging the speed controller, but you can avoid this by
ensuring that the controller’s current-handling capacity is
at least half the motor’s maximum stall current.
Particular care is called for if you are using a “hot” (i. e.
upgrade) motor, as any low-turn motor (small number of
turns on the winding) can draw many times its nominal
current when stalled, and the high current will then burn
out the speed controller.
Electrical ignition systems
Ignition systems for internal combustion engines can
also produce interference, which has an adverse effect
on the working of the radio control system.
Electrical ignition systems should always be powered by
a separate battery – not the receiver battery.
Be sure to use effectively suppressed spark plugs and
plug caps, and shielded ignition leads.
Keep the receiving system an adequate distance away
from the ignition system.
Static charges
Lightning causes magnetic shock waves which can
interfere with the operation of a radio control transmitter
even if the thunderstorm actually occurs several kilome-
tres away. For this reason …
… cease flying operations immediately if you notice
an electrical storm approaching. Static charges
through the transmitter aerial can be life-threaten-
ing!
Caution
In order to fulfil the FCC RF radiation regulations •
Safety Notes
6


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