Manual Graupner MX-16 HoTT (page 136 of 200) (English)

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Program description: Fail-Safe

FAIL SAFE

Pos

hold

1 2 3

7 8

Delay 0.25s STO

The inherently higher operational security of the HoTT

system compared with classic PPM technology is due

to the ability of the HoTT receiver’s integral micro-proc-

essor to process the signals from “its” transmitter ex-

clusively, and also to process any “dirty” control signals

which it picks up. The receiver constantly stores the

latest valid signals, and invalid signals are automatically

replaced by the stored signals - but only if the control

signal is seriously inaccurate or even damaged, e. g. due

to interference from an outside source. This process is

dependent upon various settings which are described

later in this section. For example, the receiver sup-

presses brief interference such as ﬁeld strength “holes”

and similar effects which would otherwise result in the

familiar “glitches”. When this happens, the red LED on

the receiver lights up.

If you have not yet programmed any Fail-Safe settings

in the currently active model memory, the following

warning display will appear in the basic display for a few

seconds when you switch the transmitter on:

fail safe

setup

t.b.d

Programming

The “Fail-Safe” function determines the receiver’s beha-

viour when interference occurs in the transmission from

transmitter to receiver. The receiver outputs 1 … 8 can

optionally …

maintain (“hold”) their current position:1.

If interference should occur, all servos programmed

to “hold” mode remain at the position last assessed

by the receiver as correct until such time as a new,

correct control signal arrives at the receiver, or

move to a user-selectable position (“Pos”) if interfer-2.

ence occurs, after a “delay” time has elapsed.

Use the arrow buttons  of the left or right-hand

touch-key to select the desired servo socket 1 to 8 (

),

then touch the central SET button of the right-hand

touch-key to switch between “hold” ( ) and “position” ( )

mode:

FAIL SAFE

Pos

1 2 3

7 8

STO

hold

Delay 0.25s

Now select the “Delay” option at bottom left of the

screen using the arrow buttons  of the left or right-

hand touch-key …

FAIL SAFE

Pos

1 2 3

7 8

STO

hold

Delay 0.25s

… touch the central SET button of the right-hand touch-

key, and use its arrow buttons to select your preferred

delay period from the four on offer (0.25 s, 0.5 s, 0.75 s

and 1 s).

Simultaneously pressing the arrow buttons  or 

of the right-hand touch-key (CLEAR) resets the high-

lighted ﬁeld to the default value of 0.75 s.

Now use the arrow buttons  of the left or right-hand

touch-key to select the STO ﬁeld at bottom right of the

screen; SIMULTANEOUSLY move the servos for which

you have selected Position mode to the desired posi-

tions using the associated transmitter controls.

A touch of the central SET button of the right-hand

touch-key stores these positions in the receiver as the

Fail-Safe settings, so that it can revert to these if interfer-

ence should strike.

The transmitter informs you of the stored data by brieﬂy

displaying:

FAIL SAFE

Pos

1 2 3

7 8

STO

Position

stored

hold

Delay 0.25s

Caution:

We strongly recommend that you make use of the

safety potential of this option by at least setting the

throttle position (glow-powered models) to idle, or

the electric motor to stop, if a fail-safe event should

be triggered. Model helicopters should be pro-

grammed to “hold”. This simple precaution ensures

that the model is much less likely to cause havoc

and cause property damage or personal injury.

Fail-Safe

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Graupner MX-16 HoTT Manual

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