GRAUPNER mx-20 Hott Programming Manual Download

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Safety notices

are always to be followed, this includes mandatory
adherence to the length of charging time. Never leave
batteries being charged unattended.
Never attempt to charge primary batteries (non-
rechargeable batteries) because they can explode.
All secondary batteries (rechargeable batteries) must
be charged before every session. To avoid short circuit
conditions, fi rst connect the charger cable's banana
plugs, polarity correct, into the charger and thereafter
connect the charger cable's plugs to the transmitter and
receiver batteries.
Disconnect all power sources from the model when it is
not to be used for an extended period of time.

Never

attempt to use defective batteries, damaged

batteries or mixed-type battery combinations as a single
group. Do not use mixed combinations of old and new
batteries or batteries of different manufacture.

Capacity and operating time

The rule: "capacity is reduced with every successive
recharging", applies to all batteries. Internal resistance
increases at low temperatures to further reduce capacity.
As a consequence, the battery's ability to provide
current and hold its voltage is reduced.
Frequent charging or the use of battery maintenance
programs can also result in gradual loss of battery
capacity. Therefore the capacity of batteries should be
checked at regular intervals, not in excess of every six
months, and replaced if performance is found to be
signifi cantly defi cient.
Purchase only genuine

Graupner

batteries!

Interference suppression for electric motors

All conventional electric motors produce sparks between
their collector and brushes. Depending on the type of

motor involved, this may cause more or less interference
with the functionality of the remote control system.
The electric motors of a properly built system should
therefore have interference suppression features.
For electric drive models it is particularly important
that every one of its motors is provided with proper
interference suppression. Interference fi lters extensively
suppress such disturbances and should always be
included.
Follow the respective recommendations included in the
motor's operating and installation notices.
For further details about interference fi lters, refer to the

Graupner

RC main catalog or in Internet at

www.graupner.de.

Servo interference fi lters for extension cables

Order No.

1040

The servo interference fi lter is necessary when an
extended-length servo cable is used. This fi lter is
attached directly to the receiver output. In critical cases
a second fi lter can be attached to the servo.

Using electronic speed controllers

Choosing the right electronic controller is largely a
matter of matching controller performance to the motor
to be controlled.
In order to prevent an overload or damage to the speed
controller, its current rating should be at least half of
the maximum locked-rotor current draw of the motor to
which it is connected.
Particular attention is appropriate for so-called "tuning
motors". Because of their low-turns coils these motors
can draw a multiple of their rated current in a locked-
rotor condition and this can lead to the destruction of the
speed controller.

Electric ignition systems

Combustion motor ignition systems also produce
interference that can negatively infl uence remote control
functionality.
Always supply power to an electric ignition system from
a separate, dedicated battery.
Use only interference-suppressed spark plugs, spark
caps and shielded ignition leads.
Mount the receiver suffi ciently far away from ignition
system components.

Static charges

A remote control system will be destroyed by the
magnetic shock waves produced by a lightning strike -
even if the storm is miles away. Therefore …

… stop fl ying right away if a storm is approaching.
Static charging via the antenna also represents a
lethal hazard.

Attention

In order to fulfi ll FCC HF emission requirements for

•

mobile transmitters, a distance of at least 20 cm
must be maintained between this system's antenna
and other persons when this system is operating.
Operation of this system at a lesser distance is
therefore not recommended.
To avoid disturbance caused by the electrical

•

characteristics and emissions of other transmitters,
keep at least a 20 cm distance from other
transmitters.
Operation of the remote control system requires a

•

correct program setting for the given country in the
transmitter unit. This is necessary for compliance with
diverse regulations like FCC, ETSI, CE etc. Follow
the respective instructions provided for this with the

GRAUPNER mx-20 Hott, Programming Manual

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