GRAUPNER HoTT SMART-BOX Manual page 10

Fail-safe mode (MODE): this function is used to select the fail-safe mode for the channel you have selected.
You can select either a programmed fail-safe position (Fail Safe), hold-mode for the last position (HOLD)
or OFF.
But CAUTION: if the control signal is absent, analogue servos and many digital servos offer no resistance
to the forces acting on the control surfaces, with the result that the model's control surface positions are
more or less quickly lost.
Please read the corresponding chapter in the RC system instructions on this subject.
F.S.Pos. (Fail-Safe position):
For each OUTPUT CH (receiver servo socket) activate (highlight) the value fi eld by briefl y pressing the INC
+ DEC simutanously, then use the INC or DEC buttons in the "F.S.POS." line to set the servo position which
the servo is to take up in "FAIL-SAFE" mode if interference should occur. The setting can be entered in
increments of 10 μs. Default setting: 1500 μs (servo centre).
Important note:
The "F.S.POS." function is also signifi cant if the receiver is switched on, but is (not yet) receiving a valid
signal; this applies to all three modes "OFF", "HOLD" and "FAILSAFE": The servo immediately runs to the
Fail-Safe position previously set in the "Position" line. This can be exploited, for example, to prevent the
operation of a retractable undercarriage or similar function if the receiver is switched on accidentally. How-
ever, during normal model operations the corresponding servo behaves in accordance with the set "MODE"
if interference should strike.
Fail-safe response time (DELAY): this point is used to select the delay time after which the servos run to
their selected position if interference affects the radio signal. This value is applied to all channels.
FAIL SAFE ALL (global fail-safe setting): This sub-menu can be used to defi ne the Fail-Safe position of
the servos simply by "pressing a button"; and is simple to use: Move to the "FAIL-SAFE ALL" line and press
the INC + DEC buttons simultanously to activate the value fi eld; "NO" is highlighted (black background). Now
set the parameter to "SAVE" using the INC or DEC button. Use the transmitter controls to move all the servos
which you have assigned - or intend to assign later - in the "MODE - FAIL-SAFE" line, to the desired fail-safe
positions. In the extreme bottom line "Position" displays the current position of the transmitter control for the
channel you have just set.
After touching the INC + DEC buttons once more, the display reverts from "SAVE" to "NO". This indicates
that the position of all the servos affected by the procedure have now been stored, and have also been
adopted in the "F.S.Pos." line. At the same time the position for the current OUTPUT CH (servo socket) is
immediately displayed on the screen.
Switch the transmitter off, and check the Fail-Safe positions by observing the servo movements.
Fail-safe position (POSITION): displays the Fail-Safe position for the channel set under OUTPUT CH.
"Fail-Safe" in combination with "channel mapping"
It is clearly desirable that mapped servos - i.e. servos which are controlled by a common control channel (IN-
PUT CH) - should respond in the same way when interference occurs, so the corresponding settings of the
INPUT CH determine the behaviour of mapped servos.
For example, if receiver servo sockets 6, 7 and 8 are mapped together, i.e. if the same control channel "04"
is assigned to OUTPUT CH (servo sockets) 06, 07 and 08 then INPUT CH 04 determines the Fail-Safe
behaviour of the three servos connected to control channel 4, regardless of the individual settings of the
OUTPUT CH for INPUT CH 04. This also applies, for example, if it is mapped in turn to INPUT CH 01.
In this case servo socket 04 would respond in accordance with the Fail-Safe settings for CH 01. In contrast,
the response or delay time set in the "DELAY" line always applies uniformly to all channels which are set
to "FAIL-SAFE".
CAUTION: if the receiver is switched on and you call up the fail-safe function again using the programming
button on the transmitter, any settings previously programmed in the FAIL SAFE display using the SMART-
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33700 SMART-BOX - Graupner HoTT 2.4