Spreading Wings S900 

User Manual [v1.2) 

2014.12 
Disclaimer 

Thank you for purchasing the S900. Please visit the Spreading Wings S900 page on www.dji.com regularly 

to keep up to date with product information, technical updates and manual corrections. Information in this 

manual is subject to change without notice. 

In using this product, you hereby agree to this disclaimer and signify that you have understood all points 

completely. When assembling this product, follow all instructions carefully. The manufacturer and seller 

assume no liability for any damage or injury arising from the use of this product. 

This is a class A product of the FCC certification. In a domestic environment this product may cause radio 

interference, in which case the user may be required to take adequate measures. 

DJI is a registered trademark of DJI. Names of product, brand, etc., appearing in this manual are trademarks 

or registered trademarks of their respective owner companies. This product and manual are copyrighted by 

DJI with all rights reserved. No part of this product or manual shall be reproduced in any form without the prior 

written consent or authorization of DJI. 

About 

The S900 is designed for professional aerial photography and cinematography. It is user friendly, safe, 

stabilized and easy to fly while its integrated design makes assembly and configuration simple and fast. 

Retractable landing gear, vibration dampers, slightly angled arms and a minimalized gimbal mount allow for 

a clear 360 degree view from the camera. A patented power distribution board, built-in high-speed ESCs 

and motors with high efficiency propellers ensure dynamic stability and maximized power efficiency. Used 

with a professional DJI multi-rotor autopilot system, the S900 can hover and fly reliably making it ideal for 

photography and cinematography. 

A----- 433mm 

2 © 2014 DJI. All Rights Reserved. 
Contents 

Disclaimer 

About 

Contents 

Cautions 

Legend 

In The Box 

Mounting the Landing Gear 

Mounting Frame Arms 

Mounting Electronics and Wiring 

Connecting XT60 Ports on the Center Frame 

Installing Battery 

Setting Up the Landing Gear 

Mounting the Gimbal 

Appendix 

ESC Sound 

ESC LED 

Specifications 

Gain Value Settings 

FAQ 

Soldering the ESC 

Remounting the Propellers 

Propeller Precautions 

Using the Propeller Holder 

Assembling Motor Vibration Absorbers 

Remounting the Landing Gear Servo 

Recalibrating Servo Travel 

Part List 

FCC Statements 

2 

2 

3 

4 

4 

5 

6 

7 

11 

16 

16 

18 

20 

22 

22 

22 

22 

23 

24 

24 

24 

24 

25 

25 

26 

26 

27 

31 

© 2014 DJ I. All Rights Reserved. 3 
Cautions 

When flying, the rotating propellers may cause serious damage and injury. Please fly safe at all times. 

Assembly Cautions 

1. Use a bracket to mount the GPS module on the center frame to avoid interference with the power board. 

2. Ensure the IMU is mounted with the arrow pointing toward the nose of the aircraft. 

3. If using a receiver, attach it under the bottom board of the center frame with the end of the antenna 

facing downwards and away from obstructions to avoid signal loss. 

4. Ensure frame arms are mounted correctly. 

a) Motor mounts with CCW marks should be mounted to the center frame positions with the following 

marks: M1, M3 and M5. 

b) Motor mounts with CW marks should be mounted to the center frame positions with the following 

marks: M2, M4, and M6. 

5. Do not remove any glued-in screws. 

6. Screws that already have blue glue can be used once without thread locker. On other occasions, apply 

appropriate thread locker first. 

7. The S900 should be lifted off the ground when testing landing gear or recalibrating servo travel. 

Flight Cautions 

1. ESCs are not water-proof, please do not fly in rain or snow. 

2. Ensure all soft dampers and vibration absorbers are in good condition before every flight. If not, replace 

immediately. Otherwise, the flight performance of your aircraft will be adversely affected. 

3. Ensure all parts are in good condition before each flight. Do not fly with worn or broken parts. 

4. Ensure propellers and motors are installed correctly and propellers are unfolded before flying. 

5. Ensure ESC signal connectors and power cable connectors are tight before every flight. 

6. When flying, maintain a safe distance away from people, buildings, high-voltage lines, tall trees, water 

and other hazards. 

7. Use only 6S LiPo batteries for the power supply. 

8. Ensure all output signals from M1 to M6 are in proper working order when using the DJI A2. flight control 

system to avoid damage or injury. 

9. Do not overload the system. 

10. Do not get close to or touch motors or propellers when they are spinning as this can cause serious injury. 

11. Disconnect the battery and remove the camera during transportation to avoid damage or injury. 

12. We strongly recommend using as many DJI manufactured parts as possible. 

Others 

If you have any problems you cannot resolve, contact your dealer or DJI customer service. 

Legend 

~ Important ~\): Hints and Tips 

4 © 2014 DJI. All Rights Reserved. 
In The Box 

Center Frame x1 

Landing Skid Tubes x2 

(with Silicone Rubber Dampers) 

o~----~E~------o 

GPS Collapsible Mount x1 

Connection Cable 

Connector Set x1 

or 

3-PI N Connection Cables x8 

3-PIN Servo Cable x1 

Tools Required 

Tools 

2.0mm Hex Wrench, 2.5mm Hex Wrench 

Thread Locker 

Nylon Cable Tie, Scissors, Cutting Pliers/Dykes 

Foam Double Sided Adhesive Tape 

Frame Arms x6 

Landing Gear Legs x2 

Springs x2 

Accessories Package x1 

CW propellers x2 

CCW propellers x2 

Magic tapes x4 

The red knobs x6 

Landing gear leg rings x4 

Soft dampers x50 

Screw Package x1 

For frame arms mount: M4x35 

For landing gear mount: M3x8, 

M2.5x8 (socket cap), M3x22 (socket cap) 

Usage 

Mounting screws. 

Fastening screws. 

Binding devices and wires. 

Mounting receiver, controller and other modules. 

© 2014 DJ I. All Rights Reserved. 5 
Mounting the Landing Gear 

Instructions 

1. Put one landing gear leg ring onto each landing gear leg. 

2. Insert one landing gear leg into each landing skid tube and secure it in place by tightening the M2.5x8 

(socket cap) screw. Ensure silicone rubber dampers are attached to each end. 

3. Insert the landing gear leg into connection point on the center frame. Affix in place with M3x8 screws. 

4. Connect both springs on the legs to the center frame. 

0 : ~ . . 

M2.5x8 ~ 

(socket cap) IJ 

• Note the springs are 58.5mm before connecting to the center frame, and are stretched to ?Omm 

when mounting is completed. 

• It is recommended that the landing gear leg ring be placed about 30mm above the landing skid tube. 

6 © 2014 DJI. All Rights Reserved. 
Mounting Frame Arms 

Instructions 

1. Prepare the arms. 

(1) Check all propellers for cracks, then install and screw each propeller cover on tightly. 

(2) Ensure all motors are mounted firmly and rotate freely. 

(3) Mount all arms with red propeller covers to M1 and M2 to indicate the nose of the S900. 

(4) Identify the CW and CCW marks on the arms. Mount the arms with the CCW mark to the M1, M3 and 

M5 positions of the center frame. The arms with the CW mark should be mounted to the M2, M4 and 

M6 positions of the center frame. 

Cover Propeller 

Screw -------;~;; 

Motor ----::;:T----j1~~~ CW or CCW Mark 

LED* 

2. Insert each frame arm vertically into the mounting 

area on the center frame. 

3. Line up the screw holes of the frame arm and 

center frame. 

4. Insert the M4x35 screw from the right of the 

frame arm (the thread is located on the left of the 

screw mount). Tighten each screw correctly. Over 

tightening may lead to connector abrasion. 

Power Cable 

ESC Signal Cable 

*LED is on after motor started. 

© 2014 DJ I. All Rights Reserved. 7 
Spreading Wings S900 User Manual 

5. Gently lift the frame arm. 

6. Twist the red knob to lock each arm in place. Be sure there is an audible click, which indicates a proper 

lock. Check the arm for movement. To store, untwist the knob and lower the frame arm. 

,~---

! 

11/1 

II I I i 

7. Now unscrew 6 screws (M2.5x8 cheese) on the upper plate of the center frame and remove the upper 

plate. Then unscrew the 4 screws (M3x8 self-tapping, found under the center frame) of the round cover 

and remove it to gain access to the ESC and power cable installation area. 

8. Plug each ESC signal cable into the slot near each arm on the center frame. 

8 © 2014 DJI. All Rights Reserved. 
Spreading Wings S900 User Manual 

9. Connect the power cables to the center frame. Each cable must be screwed into a positive ( +) or negative (-) 

gold bracket. Each bracket will have two cables of the same color screwed into it. Red cables are positive 

and black cables are negative. 

10. To ensure a reliable connection, rotate the screw until it is both tight and parallel to the connecting 

bracket. 

@@ 

V X 

11. Ensure all ESC cables, and power cables are correctly installed onto the center frame. 

© 2014 DJ I. All Rights Reserved. 9 
Spreading Wings S900 User Manual 

12. Replace the round cover of the center plate, and re-tighten the 4 screws (M3x8 self-tapping). Then 

replace the upper plate of the center frame, and re-tighten the 6 screws (M2.5x8 cheese). 

13. Double check all frame arms. Arms M1 and M2 are the forward facing (nose), arms M4 and M5 are the 

tail. Seen from the top, motors on arms M1, M3 and M5 rotate counter clockwise while those on arms M2, 

M4 and M6 rotate clockwise. 

M1 

M3 M6 

10 @ 2014 DJL All Rights Reserved. 
Mounting Electronics and Wiring 

Eight positions are reserved for mounting a flight control system, wireless video transmission module, 

receiver, and other accessories. The DJI A2 flight control system has been used here as an example. If using 

an A2., follow mounting and wiring instructions found in the A2 flight control system user manual. If using 

the DJI WK-M flight control system, please refer to the WK-M user manual for connections. Also be sure the 

firmware on your DJI flight controller has been updated to the latest version. 

Instructions 

1. Attach IMU module to the IMU area of the center frame. Ensure that it points toward the nose. 

2. Attach the PMU module to the center frame. 

& Only mount the IMU in the IMU position of the center frame. 

3. Mount the flight controller in the reserved position near the PMU module. 

0 0 .... 1!J ~: "' "~ 

~-· A2 ·~ ~-· "'~ 

~-· "'~ ~-, ...... ~ "'~ 

~-· .........., 

~ 

-&§ ~b • 

A2 Flight Controller 

© 2014 DJI. All Rights Reserved. 11 
...... 

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Spreading Wings 5900 User Manual 

4. Attach the GPS collapsible mount to the center frame using M2.5x8 screws. 

5. Mount a GPS module to the GPS mount with a bracket. Ensure the arrow points toward the nose and avoid 

catching your fingers in the bracket when folding for transportation. 

- 0 

6. The other reserved positions are indicated in the diagram below and can be used for mounting a receiver, 

LED flight indicator, iOSD module and wireless video transmission module. 

12 © 2014 DJI. All Rights Reserved. 
Spreading Wings S900 User Manual 

7. Check that every anti-drop screw has been firmly installed in the reserved positions. Thread locker is 

recommended. 

(1) Remove the anti-drop screws to apply appropriate thread locker. 

(2) Replace and tighten. 

8. Note that the dampers are 30° silicon rubber. If you use other dampers or vibration absorbing balls, the 

quality of your aerial photography may be affected. 

& • Mount the GPS with a bracket to avoid interference from the center frame power board. 

• Use glue to install the GPS bracket. Ensure it is firm and stable before every flight. 

• Always test motors using the Assistant Software after installation. Refer to your flight control system 

user manual for details. 

© 2014 DJI. All Rights Reserved. 13 
Spreading Wings S900 User Manual 

Connecting the flight controller to the center frame 

1. Connect the flight control system according to your flight control system user manual. 

2. Connect the flight controller to the center frame with the connection cables. 

There are two kinds of connection cables. Choose the corresponding connection mode according to the 

connection cable in the box. 

Using the connector set: ~~~§~ c10i£§ 

Plug in the connector set to the ESC signal outlet on the center frame. Then plug in the connector set to 

flight controller as shown below. 

(1) Yellow 4-pin cables are for M1- M4 connections. The yellow cable should be connected to M1. 

(2) Brown 4-pin cables are for M5- M6 connections. The brown cable should be connected to M5. 

(3) Black 4-pin cables are for four continuous ground pins connections. M1-M4 are connected as the 

following diagram shows. 

::, ~ M4 5~ 0 ~ M5 -o£).) 0 

M6 0 0 0 

0 0 0 

0 0 0 

Ml 

M2 

M3 

M4 

M5 

M6 

0 

l () .... 

0 

A2. Flight Controller the ESC Signal Outlet 

Using the 3-pin connection cable: L~~~~~~~~ _j!lliJ 

M1 through M6 correspond to each motor number. 

0 0 0 Ml 

1-- M1 

0 0 0 M2 1--M2 D~ 

~r)__, 0 0 0 M3 1--M3 

1-- M4 0 0 0 M4 ~ LJ . ~ 1-- Ms 

0 0 0 M5 1-- M6 

0 0 0 M6 if_ 0 0 0 %~ 0 0 0 .._____ 

the ESC Signal Outlet 

14 @) 2014 DJL All Rights Reserved. 

0 0 ~ F4-o LINK LED F3..., 

F2..., 

A2 F1 ..., 

Xll-o 

:x:z..., 

FLIGHT CONTROLLER X1..., 

(Cijmg I Ep !!NIT) 

• <51 ~~ 

------

A2 Flight Controller 
Spreading Wings S900 User Manual 

& If using a DJI WK-M flight controller, you must use the wires that came with the WK-M. M1 through 

M6 correspond to each motor number. 

Ml 0 0 

M2 0 0 

M3 0 0 

~ M-4 0 0 

f- MS 0 0 ~(2? l 

M6 0 0 

0 0 

0 0 

WKM Flight Controller the ESC Signal Outlet 

Connecting the flight controller and landing gear 

1. Connect the left servo (between M3 and M4) cable to the "L" port of the landing gear control board. 

2. Connect the right servo (between M5 and M6) cable to the "R" port of the landing gear control board. 

3. For the A2 flight control system, connect the F1 port of the flight controller to the "IN" port of the landing 

gear control board. Other flight control systems connect a 2-position channel receiver to the "IN" port. 

Dl C) 0 

_ ... , .. ~ 

_,. 

A2 _ ... 

_,. 

_,. 

_,. fl.!I;HI'"Q;Itffiii;IUD ........, 

u ib ii .. 

& • If right and left servo cables are reversed, the landing gear will not function properly. 

• Connect all wires carefully and neatly to avoid cable damage caused by frame edges. 

© 2014 DJI. All Rights Reserved. 15 

..., 

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Q 

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g, 

:::J 

co 

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en 

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"T1 

Connecting XT60 Ports on the Center Frame 

The bottom board is a power distribution board with three XT60 connectors for battery power. 

Instructions 

1. Connect the PMU power cable to the XT60 connector on top of the bottom board. 

2. Connect the landing gear control board cable to the XT60 connector on the bottom of the bottom board. 

3. Other connectors can supply power for other DJI devices, as required. 

~ Installing Battery 

-- Soldering battery connectors 

AS150 spark-proof connectors are used. They must be soldered to your battery power cables. 

1. Remove the original battery connectors. Avoid cutting the power and ground cables at the same time, as 

this can cause a short circuit. We recommend wrapping unsoldered cables with insulating tape to prevent 

accidental connections. 

2. Pass the black ground wire through the black housing. After passing the wire through, solder the female 

bullet connector to the ground wire. Wait for the soldered connection to cool, then pull the housing back 

over the bullet connector. 

3. Screw and pass the red power wire through the red housing. After passing the wire through, solder the 

male bullet connector to the power wire. Wait for the soldered connection to cool, and then screw and pull 

the housing back over the bullet connector. 

======J:J+-- UI 

-----111111 

Connectors soldering diagram 

16 @) 2014 DJL All Rights Reserved.