User manual

Flight
1. Digital Compass Calibration
 Why calibrate the compass?
Ferromagnetic substances placed on multi rotor or around its
working environment will affect the reading of earth magnetic
for digital compass, it also reduces the accuracy of the multi
rotor control, or even reads incorrect heading. Calibration will
eliminate such influences, and ensure MC system performs
well in a non-ideal magnetic environment.
 When to do it?
1 The first time you install WKM on your multi rotor.
2 When the multi rotor mechanical setup is changed:
a) If the GPS/Compass module is re-positioned.
b) If electronic devices are added/removed/ re-positioned
(Main Controller, servos, batteries, etc).
c) When the mechanical structure of the multi rotor is
changed.
3 If the flight direction appears to be shifting (meaning the
multi rotor doesn’t “fly straight”).
4 The LED indicator often indicates abnormality blinking
when the multi rotor yaws. (It is normal for this to happen
only occasionally.)
 Calibration procedure:
Tx
1 2 3
3 Position
Switch
STEP1: Enter calibration mode: quickly slide the control mode switch
from Position-1to Position-3 for 6 to 10 times, and LED
indicator will be constantly on in blue;
STEP2: Calibration in horizontal: rotate you multi rotor along with the
horizontal surface until the green light is on constantly, then
go to the next step;
STEP3: Calibration in vertical: while green light is constantly on, hold
your multi rotor vertically and rotate it along with its vertical
axis, keep rotating until the green light is off, meaning the
calibration is finished.
STEP4: After you finished the calibration, LED indicator will show
whether the calibration was successful or not:
 If white light turns on for 3 seconds, calibration succeeds,
calibration mode will auto exit;
 If red light keeps blinking quickly, the calibration has failed.
Slide the control mode switch one time to cancel current
calibration, and then re-start from step 1 for re-calibration.
1 Don’t calibrate your compass where there is
strong magnetic interference, such as
magnetite, car park, and steel reinforcement
under the ground.
2 DO NOT carry ferromagnetic materials with you
during calibration, such as keys or cell phones.
3 You don’t need to rotate your multi rotor on a
precise horizontal or vertical surface, but keep at
least 45° difference between horizontal and
vertical calibration.
4 MC cannot be work in the polar circle.
If you keep having calibration failure, it might suggest that
there is very strong magnetic interference around the GPS &
Compass module, please avoid flying in this area.
2. Fly Cautions
Make sure you have read the following cautions before
the flight.
 Make sure you have assembled your multi rotor correctly.
 Make sure you have done the configuration procedure
correctly.
 Any of the following mistakes will leads to dangerous
accident, double check all these items:
 Rotation direction of motor is opposite;
 Propeller installation mistake;
 IMU installation mistake;
 Wrong connection between MC and ESC;
 Input direction opposite.
 In Atti and GPS Atti mode, throttle stick center position is for
0m/s on the vertical direction. If you pull the stick to the
bottom during the flight, multi-rotor will descend; If you pull
the stick to the bottom on the ground, it will cut motors in 3
seconds. However the slow spinning of motors will affect the
flight performance, you’d better keep throttle stick position
higher than 10% from cut-throttle during the flight! In Manual
Mode it will cut motors when pull throttle stick under 10%.
 Make sure switch on the transmitter first, then power on
multi-rotor! (Power off multi-rotor first, then switch off the
transmitter after landing!)