Use With Rechargeable Batteries; Fitting / Replacing The Transmitter Batteries; Transmitter Voltage Indicator; Operating Times - ROBBE-Futaba T4YF Mode1 2,4GHz Mode D'emploi

5. use With rechargeaBle Batteries

5.1 fitting / replacing the transmitter Batte-
ries
The T4YF radio control system is supplied complete with bat-
teries, and you will find a battery compartment in the back of
the transmitter. The compartment must be opened in order to
fit or replace the batteries. This is accomplished by pushing
down lightly at the marked point, and sliding the cover off in the
direction of the arrow.Once you have fitted new batteries, the
state of charge must be checked before you use the system:
switch the transmitter on, and check the state of charge by
observing the LED voltage indicator. If the batteries are not
fully charged, they must be recharged. If the transmitter is not
to be used for a long period, we recommend that you remove
the batteries from the transmitter.
5.2 charging the Batteries using the plug-tYpe
charger
The charger features two separate outputs, each delivering a
charge current of 150 mA, plus an LED charge indicator for
each output. The Tx output is for four cells (transmitter), and
the Rx output is for four or five NC / NiMH cells (e.g. recei-
ver battery). Each output is fitted with an LED indicator which
lights up during the charge process.
Charge currents, charge time A maximum charge current of
about 150 mA per output is available for charging the batte-
ries. The charge time varies according to the capacity of the
cells to be charged. Charge time (standard) = Battery capacity
(mAh) x charge factor 150 mA
example: transmitter battery, 4.8 V / 2500 mah
charge time: 2500 mah x 1.4 = 23 hours
150 ma
this example assumes that the battery is completely flat
before charging.
* charge factor for nimh cells = 1.4
If you are using batteries with a capacity lower than 2500 mAh,
the charge time will be shorter; if the capacity is higher, the
charge time will be longer.
Modellbau Lindinger GmbH
6
skysport t4Yf 2,4 ghz
The charge process must be interrupted if:
the NiMH batteries heat up to more than about 45°C.
If charged at a current of 1/10 of their nominal capacity, modern
NiMH batteries are not likely to be damaged by overcharging,
which means that you can also charge partly discharged batte-
ries for the same period (max. fourteen hours).
connecting and charging the batteries:
• The transmitter must be left switched off for the whole period
of the charge process.
• First connect the battery charger to the mains supply (230 V /
50 Hz).
• Connect the receiver battery and / or the robbe-Futaba trans-
mitter to the appropriate charge leads (RX or TX).
• If the battery is connected correctly, the corresponding LED
lights up, and the charge process starts.
caution:
the charger does not switch itself off automatically. dis-
connect and remove the battery at the end of the calcu-
lated time. When removing the battery, first disconnect it
from the charger, and then disconnect the charger from the
mains supply.
After a protracted period of storage (Winter break), the batteries
should be cycled (discharged, then charged again) three times
before use, as they only regain their full capacity and duration
after being conditioned in this way. If you charge the batteries
with a charger other than the plug-type unit supplied in the set,
you should not exceed a maximum charge current of 1 A. Ple-
ase note that it is not possible to charge the batteries using a
reflex or discharge process when they are fitted in the transmit-
ter. If the plug-type charger is not connected to the main supply,
remember to disconnect any batteries connected to the unit!
safety notes:
• Do not submerge the batteries in water or any other liquid.
• Do not short-circuit the batteries or charge them with reversed
polarity.
• Do not subject the batteries to physical pressure; do not
deform or throw it.
• Do not modify or open the battery cells.
• Rechargeable batteries may only be charged using a charger
designed expressly for this purpose. Never connect the battery
directly to a mains PSU.
• Keep the batteries well out of the reach of children.
• Avoid the fluid electrolyte contacting your eyes. If this should
occur, rinse the affected part immediately with plenty of clean
water before seeking medical attention.
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• If the fluid electrolyte should contact your clothes or any other
object, immediately wash it off using plenty of water.
• Never leave the batteries and charger operating unsupervised.
• Do not operate the charger where inflammable gases might be
present.
• Never cover the cooling slots.
• Observe correct battery polarity and the manufacturer's
instructions; avoid short-circuits.
• Disconnect the battery if it becomes hot to the touch.
• Always assign the batteries to the correct output according to
their cell-count.
• Do not exceed the calculated charge time.
• Never charge batteries on an inflammable surface, and do not
leave them on charge without supervision.
• The charger may only be used in dry indoor conditions.
• If the mains supply should fail, or if the mains plug is pulled
out, disconnect the batteries from the charger to avoid them
discharging each other.
• The charger is only suitable for use with rechargeable cells.
• Never attempt to recharge dry cells - explosion hazard!

5.3 transmitter VOltage indicatOr

The voltage of the transmitter battery is indicated by the red
transmitter voltage LED. If the LED flashes slowly, the battery
voltage has fallen to around 4.2 V, and the transmitter battery
urgently needs to be recharged. If this should occur when you
are operating a model, cease operations immediately in the
interests of safety.

5.4 Operating times

If the transmitter is fitted with high-performance NiMH 2500 AA
transmitter cells, No. 8005, its operating time is around twenty
hours from a fully charged pack. The same does not apply to
the receiver battery, as the operating time for receiver packs
varies greatly according to the number of servos connected to
the receiver, the stiffness of the mechanical linkages, and the
frequency of the control commands. When the servo motor is
running, a typical servo draws between 150 and 600 mA, but
this is reduced to about 5 - 8 mA with the motor at rest. When
the servo reaches the position dictated by the transmitter stick,
the servo motor is switched off, and the unit only draws the idle
current; this is true whether the servo is at centre, one end-
point, or any intermediate position.For this reason it is important
to ensure that the mechanical linkages are free-moving, and
that no servo is mechanically obstructed at any point in its arc
of movement.
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