An introduction of go-home and landing – DJI Phantom Quick Start User Manual

Page 14

14 |

The flowchart of failsafe and how to regain control

An introduction of Go-Home and Landing.

Record Home Point

Home Point

Signal lost

Multi-rotor

Signal lost >3s

Stay hover

Ready to Go-Home

Current location ≤ 20m

Current location > 20m

Ground

20m

Ascend

first

Hover 15s, then land

Go-Home

Home-point: Every time you power on, after first motors start, and if 6 or more GPS satellites are found (Red light blinks

once or no blinking) for 10 seconds, the current position of multi-rotor will be saved as home-point by MC automatically.

Note

1. Please make sure to record the home-point during flight, and clearly know where it is.

2. During go-home the nose direction of the aircraft is facing toward the home-point, and the aircraft is

flying directly from the current position to the home-point.

The flowchart of failsafe and how to regain control

(the following content is for the firmware v3.12)

(3)Turn off the
transmitter (we
assume you want
to trigger failsafe)

(1) The aircraft
flies far away,
transmitter is on
but the signal is
weak.

Attitude Mode: In Attitude Mode as soon
as you get signal you can regain control.

GPS Mode: switch the transmitter mode
switch S1 to the middle position (ATTI.
Mode), if the receiver is connected, then
you will regain control.

Attitude Mode: (1) the aircraft will level its attitude immediately (2) 3 secs
later, failsafe is triggered and aircraft will start to go home. (3) If signal is
regained during (1) or (2), it will resume normal flight immediately.

GPS Mode: (1) the aircraft will slow down and hover. (2) if the signal is
restored within 3 seconds (transmitter and receiver connected), the
system will immediately return to normal operation; does not enter
failsafe. (3) if not reconnected within 3sec, the system will enter failsafe,
then even if the signal is restored, the system will not exit failsafe.

We strongly recommend you DO NOT try

“Turn off the transmitter”, because

there are three types of risk:
(1) You must be pretty clear whether the Home-point is OK for landing or not. (You
have to understand the definition of Home-point well and the working process of
failsafe)
(2) If there are tall buildings around, the aircraft may be obstructed on the way.
(3) When GPS signal is bad or GPS is not working, failsafe will not work.

In this case, the behavior of the aircraft is the same as in the above
condition.
If you want the aircraft to Return Home, please do not turn the
transmitter back on within 3 seconds

, otherwise the aircraft will exit

failsafe mode immediately.

When you turn off the transmitter, use the following
method to regain control:
(1) Switch the transmitter S1 switch to GPS. position.
(2) and then put the throttle stick to lowest position,
you can now turn the transmitter back on (greater than
5secs after switching off, important), then put throttle
stick to the center position immediately. If you hear the
transmitter alarm, make sure the throttle stick is at the
bottom position before moving to the center position.
(3) then you can switch the transmitter S1 switch to the
middle position (ATTI. Mode) to regain control.

If you choose to turn off the transmitter,
you must be pretty sure that you know
how to regain control. Here we offer a
method, please read carefully.

This section will demonstrate the working logic of failsafe and how to regain control.
The following description is effective only when:
1. The aircraft is in flight.
2. The GPS works normally and

signal is GOOD

(≥6 satellite, the LED blinks a single red light or

no red light).

Note: if you start the motors, but do not push the throttle to take-off the aircraft, in
this case it is very dangerous to turn off the transmitter, because the aircraft will take
off automatically, so do not try this.

The aircraft behavior after
failsafe

How to regain control

Precautions

What triggered failsafe

If signal lost for more than 3 seconds failsafe will be triggered, if signal regained

within 3 seconds it will exit failsafe immediately.

(2) One position of switch S1 is set
as

“Failsafe” in the Assistant

software, and you toggle the S1 to

“Failsafe” position during flight.

The aircraft will slow down and hover. Then the system
will enter failsafe mode after 3 seconds.

Switch the transmitter mode switch S1 to
the middle position (ATTI. Mode), then
you will regain control.