Manual Graupner MX-16 HoTT (page 142 of 200) (English)

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Program description: Telemetry menu

For each selected OUTPUT CH (receiver servo socket)

you can choose between:

FAI(L) SAFE•

If interference occurs, the corresponding servo

moves to the position displayed in the “POSITION”

line for the duration of the interference, after the “de-

lay time” set in the “DELAY” line.

HOLD•

If interference occurs, a servo set to “HOLD” main-

tains the position last assessed as correct for the du-

ration of the interference.

OFF•

If set to “OFF” when interference occurs, the receiv-

er continues to send the last correct control signals

(which it has stored) to the corresponding servo out-

put for the duration of the interference. This can be

imagined as the receiver switching the signal wire

“off”.

But CAUTION: if the control signal is absent, ana-

logue servos and many digital servos offer no resist-

ance to the forces acting on the control surfaces, with

the result that the model’s control surface positions

are more or less quickly lost.

F.S.Pos. (Fail-Safe position)

For each OUTPUT CH (receiver servo socket) activate

(highlight) the value ﬁeld by brieﬂy pressing the central

SET button of the right-hand touch-key, then use the ar-

row buttons of the right-hand touch-key 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 signiﬁcant if the receiver

is switched on, but is (not yet) receiving a valid signal;

this applies to all three modes “OFF”, “HOLD” and “FAIL-

SAFE”:

The servo immediately runs to the Fail-Safe position pre-

viously set in the “Position” line. This can be exploited,

for example, to prevent the operation of a retractable un-

dercarriage or similar function if the receiver is switched

on accidentally. However, during normal model opera-

tions the corresponding servo behaves in accordance

with the set “MODE” if interference should strike.

DELAY (fail-safe response time or delay)

At this point you can set the delay time after which the

servos are to run to their previously selected positions if

the signal should be interrupted. This setting applies to

all channels, but only affects the servos programmed to

“FAIL-SAFE” mode.

Default setting: 0.75 s

FAIL SAFE ALL (global fail-safe setting)

This sub-menu can be used to deﬁne the Fail-Safe

position of the servos simply by “pressing a button”; it

operates in a similar manner to the “Fail-Safe” menu

described on page 136, and is simple to use:

Move to the “FAIL-SAFE ALL” line and press the central

SET button of the right-hand touch-key to activate the

value ﬁeld; “NO” is highlighted (black background). Now

set the parameter to “SAVE” using one of the arrow

buttons of the right-hand touch-key. 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:

RX FAIL SAFE

INPUT CH: 01

MODE : FAI-SAFE

F.S.POS. : 1500µsec

DELAY : 0.75sec

OUTPUT CH: 01

POSITION : 1670µsec

FAIL SAFE ALL: SAVE

After touching the central SET button of the right-hand

touch-key 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.

RX FAIL SAFE

INPUT CH: 01

MODE : FAI-SAFE

F.S.POS. : 1670µsec

DELAY : 0.75sec

OUTPUT CH: 01

POSITION : 1670µsec

FAIL SAFE ALL: NO

Switch the transmitter off, and check the Fail-Safe posi-

tions by observing the servo movements.

“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

(INPUT 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 …

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Graupner MX-16 HoTT Manual

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