GRAUPNER SJ HOTT mxs-8 Manuel De Programmation page 43

Receiver power supply
also be sure to consider the receiver when estimating
needs, because with its bidirectional functionality it will
draw about 70 mA of current as well.
It is also general good practice to connect the receiver
to the power supply via two cables rather than just one.
You could do this for example by using two power supply
cables to connect one switch or voltage regulator to the
receiver. If you require one or both transmitter connectors
for connecting a servo, speed controller or other compo-
nent, use if necessary a V or Y cable, order no. 3936.11
(refer to figure). This double-connection technique to
switches and speed controllers not only reduces the risk
entailed in a cable break but also ensures a more uniform
supply of power to the connected servo.
V-Kabel
Best.-Nr. 3936.11
NiMH four cell battery packs
Provided that the aforementioned conditions are met,
your Graupner HoTT receiver system can be readily
operated with traditional four cell battery packs as long as
the packs have adequate capacity and voltage level.
NiMH five cell battery packs
Five cell battery packs offer a greater voltage range than
four cell packs.
Note, however, that not every servo available on the
market is compatible (in the long term) with the voltage
level outputted by a five cell pack; this is particularly true
when the battery pack is freshly charged. Some of these
servos react with a noticeable 'grinding' sound.
Therefore consider the specifications of the servos you
use before selecting a five cell battery pack.
LiFe 6.6 V batteries with two cells
From today's perspective, these new cells are the best
choice.
LiFe cells are also available in hard plastic casings to
protect them from mechanical damage. Like LiPo cells,
LiFe cells can be quickly charged in suitable chargers and
they are comparatively hard-wearing.
This type of cell battery is also rated for a significantly
greater number of charge/discharge cycles than, for
example, LiPo batteries. The 6.6 V output rating of a two
cell LiFe battery pack does not present a problem, neither
for Graupner HoTT receivers nor for the servos, speed
controllers, gyros and other devices which have been
Sonderfunktion
PRX stabilisierte Emp-
fängerstromversorgung
Best.-Nr. 4136
specifically approved for operation in this (higher) voltage
range. Please note however that practically all servos,
speed controllers, gyros and other devices available in
the past and most such devices currently available on the
market have an approved voltage range of only 4.8 to 6 V.
Use of such batteries in conjunction with these devices
require a stabilized voltage regulator, e.g. the PRX, order
no. 4136 (refer to appendix). Otherwise there is a risk of
damage to any connected devices within a short period
of time.
LiPo two cell packs
For a given capacity, LiPo batteries are lighter than NiMH
batteries, for example. LiPo batteries are also available
in hard plastic casings to protect them from mechanical
damage.
The comparatively high 7.4 V output rating of a two cell
LiPo battery pack does not in fact present a problem,
neither for Graupner HoTT receivers nor for the servos,
speed controllers, gyros and other devices which have
been specifically approved for operation in this (higher)
voltage range. Please note however that practically all
servos, speed controllers, gyros and other devices availa-
ble in the past and most such devices currently available
on the market have an approved voltage range of only
4.8 to 6 V. Use of such batteries in conjunction with these
devices require a stabilized voltage regulator, e.g. the
PRX, order no. 4136 (refer to appendix). Otherwise there
is a risk of damage to any connected devices within a
short period of time.
Note:
If you have a speed controller with integrated BEC* arran-
ged in parallel with the receiver battery, depending on the
speed, the positive pole (red cable) may need to be remo-
ved from the three pin connector (refer to figure).
Be sure to consider any information about this in the in-
structions for the speed controller used.
rot
1
2
with insulation tape to prevent possible short circuits
(3).
Receiver system power supply
With a small screwdri-
ver, carefully lift up the
center latch of the
3
connector slightly (1),
then pull out the red
lead (2) and wrap it
43 43