GRAUPNER mx-16 ifs, Programming Manual

Page: 26 / 132

26 Using the receiving system for the fi rst time
National settings
Please refer to the instructions supplied with the receiver,
and the paragraph on page 126.
FAIL-SAFE settings
In its factory default state the receiver is set to maintain
the servos at the last valid position detected by the
receiver (“hold mode”) if a Fail-Safe event should oc-
cur. We strongly recommend that you make use of the
system’s safety potential by programming the fail-safe
throttle position of a glow-powered model to idle, or the
throttle position of an electric-powered model to “motor
stopped”. In this way you ensure that the model is much
less likely to cause havoc if subjected to interference;
if this should occur on the ground, the model could
otherwise cause serious personal injury or damage to
property.
A further option can be set which defi nes the period (1
… max. 5 sec.) after which the Fail-Safe function is to
become active.
The factory default setting is two seconds.
Low voltage warning
If the receiver LED glows orange , then the low voltage
warning indicator is active. This means that the voltage
is or was below about 4.4 V, although the collapse might
have been brief due to a momentary heavy load.
Please ensure that the batteries are fully charged before
you fl y your model. Check that control surface linkages
are free-moving; it is good practice to measure the volt-
age drop over the switch harness installed in the model.
Although the iFS system continues to work down to
voltages below 3.5 V before it automatically restarts,
the warning indicator should not be ignored, as in most
cases it is a clear indication of a power supply which is
not “fi t for purpose”.
Safe model operation depends upon many factors, but
one of them is certainly a reliable receiver power supply.
If your model’s linkages are free-moving, the battery is
fully charged, the conductors of the battery connecting
leads are of adequate cross-section, the contact resist-
ance at the connectors is minimal, etc., but the receiver
LEDs insist on glowing a constant
red (output stage 1) or
green (output stages 2 … 5), then the servos are drawing
an excessive current for the system. If this should occur,
consider using a higher-capacity battery, perhaps with
fi ve cells, or the PRX stabilised receiver power supply,
Order No.
4136 , described in the Appendix.
Servo sockets and polarity
The servo sockets of the Graupner | iFS receiver are
numbered. The socket marked “B/T” is intended for
the battery, but also doubles as the data socket for the
telemetry sensor.
Never connect this socket with reversed polarity!
This would cause the receiver to switch itself on,
and appear to be working normally, but it would not
function correctly!
The power supply voltage is through-connected via all
the numbered sockets. The function of each individual
channel is determined by the transmitter you are using,
rather than by the receiver. Example: the throttle servo
socket is defi ned by the radio control system, and may
differ according to the make and type. In the case of
JR
radio control systems the throttle function is assigned to
channels 1 or 6, whereas it is allocated to channel 3 in
the case of Futaba radio control systems.
Concluding notes:
The much higher servo resolution of the iFS system •
results in a more direct response compared with pre-
vious technologies. Please take a little time to become
accustomed to the feeling of fi ner control!
If you wish to use a speed controller with integral
•
BEC* system in parallel with a separate receiver bat-
tery, in most cases (depending on the speed control-
ler) the positive terminal (red wire) must be removed
from the three-pin connector, as shown in the dia-
gram. Be sure to read the appropriate notes in the in-
structions supplied with your speed controller before
doing this.
Carefully raise the central
lug of the connector slightly
(1), withdraw the red wire
(2) and insulate the bare
contact with tape to avoid
possible short circuits (3).
Observe the installation notes regarding the servos, re-
ceiver and receiver aerial, which you will fi nd on page 30.
* Battery Elimination Circuit
red
1
2
3