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 certication. 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 efciency propellers ensure dynamic stability and maximized power efciency. Used
with a professional DJI multi-rotor autopilot system, the S900 can hover and y reliably making it ideal for
When ying, the rotating propellers may cause serious damage and injury. Please y 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.
Cautions
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 rst.
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 y in rain or snow.
2. Ensure all soft dampers and vibration absorbers are in good condition before every ight. If not, replace
immediately. Otherwise, the ight performance of your aircraft will be adversely affected.
3. Ensure all parts are in good condition before each ight. Do not y with worn or broken parts.
4. Ensure propellers and motors are installed correctly and propellers are unfolded before ying.
5. Ensure ESC signal connectors and power cable connectors are tight before every ight.
6. When ying, 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 ight 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.
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 M2.5×8
(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. Afx in place with M3×8 screws.
4. Connect both springs on the legs to the center frame.
Mounting the Landing Gear
M2.5×8
(socket cap)
Note the springs are 58.5mm before connecting to the center frame, and are stretched to 70mm
when mounting is completed.
It is recommended that the landing gear leg ring be placed about 30mm above the landing skid tube.
(1) Check all propellers for cracks, then install and screw each propeller cover on tightly.
(2) Ensure all motors are mounted rmly 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.
PropellerCover
Screw Mount Power Cable
ESC Signal Cable
Screw
Motor
ESC
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 M4×35 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.
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.
Mounting Frame Arms
7. Now unscrew 6 screws (M2.5×8 cheese) on the upper plate of the center frame and remove the upper
plate. Then unscrew the 4 screws (M3×8 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.
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.
11. Ensure all ESC cables, and power cables are correctly installed onto the center frame.
Eight positions are reserved for mounting a flight control system, wireless video transmission module,
receiver, and other accessories. The DJI A2 ight control system has been used here as an example. If using
an A2, follow mounting and wiring instructions found in the A2 ight control system user manual. If using
the DJI WK-M ight control system, please refer to the WK-M user manual for connections. Also be sure the
rmware on your DJI ight 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.
Mounting Electronics and Wiring
IMU
Only mount the IMU in the IMU position of the center frame.
3. Mount the ight controller in the reserved position near the PMU module.
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.
dampers
Mounting Electronics and Wiring
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 rm and stable before every ight.
Always test motors using the Assistant Software after installation. Refer to your ight control system
Connecting the ight controller to the center frame
1. Connect the ight control system according to your ight control system user manual.
2. Plug in the connector sets to the ESC signal outlet on the center frame. Then plug in the connector set to
ight 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.
Mounting Electronics and Wiring
M1
M2
M3
M4
M5
M6
yellow
brown
1
2
A2 Flight Controller
If using a DJI WK-M ight controller, you must use the wires that came with the WK-M. M1 through
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 ight control system, connect the F1 port of the ight controller to the “IN” port of the landing
gear control board. Other ight control systems connect a 2-position channel receiver to the “IN” port.
R
L
IN
Mounting Electronics and Wiring
F1
IN
L
R
Right Servo ConnectorLeft Servo Connector
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.
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.
Connecting XT60 Ports on the Center Frame / Installing Battery
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.
Using a 2-position RC transmitter switch, landing gear retraction can be carried out remotely.
Setting up the transmitter
Select a 2-position switch (default setting is OK) as the control input for the landing gear. Ensure the
corresponding receiver port is connected to the “IN” port on control board. For the A2 flight control
system, connect the ight controller’s F1 port to “IN” port on control board.
Upper: Toggle the switch to this position to raise the landing gear.
Lower: Toggle the switch to this position to lower the landing gear.
Setting Up the Landing Gear
If the transmitter switch has a FailSafe function, set the FailSafe value to the [Lower] position. This
ensures that the landing gear will lower automatically when the receiver enters FailSafe mode.
To avoid accidental switch triggering, slide levers or other controls can be used for landing gear
control.
Usage procedures
1. Ensure transmitter and receiver batteries are fully charged.
2. Toggle the switch to the [Lower] position, and then turn on the transmitter.
3. Ensure the “R”, “L” and “IN” connections are correct.
4. Ensure the landing gear is in the [Lower] position, then power on the system. If a solid green LED on the
landing gear control board lights up, everything is normal. If it ashes green slowly, re-calibrate the system
according to instructions in “Recalibrating Servo Travel”.
5. Toggle the switch to the [Upper] position ONLY AFTER takeoff.
6. Toggle the switch to the [Lower] position for landing.
Before assembling the gimbal, install the GCU as shown below. Be sure to install on the side as shown below.
A DJI Z15-GH4 (HD) gimbal has been used as an example in the following diagrams.
Mounting the Gimbal
The connectors on gimbal should be removed for better performance, then the gimbal can be mounted to
the lower connection points. Users of DJI Z15-5N / 7N gimbal, refer to the DJI Z15-5N / 7N Gimbal Mounting
Notes (Page 21) for details.
1. Insert the propeller blades into the propeller holder. 2. Attach the propeller holder to the frame arm.
Assembling Motor Vibration Absorbers
A soft damper is part of the vibration absorber. Assemble soft dampers as shown below. Assembly is the
same for CCW and CW propellers.
FAQ
Ensure all soft dampers and vibration absorbers are in good condition before every ight. If not,
replace immediately. Otherwise, the ight performance of your aircraft will be adversely affected.
Before installing the soft dampers, put the copper gaskets onto the four mounting holes on the
carbon plate. Then put the soft dampers into the mounting holes.
After tightening the screws, the vibration absorbers may be twisted. If this is the case, hold the
motor with your thumbs under the base plate and ngers on the top carbon plate, and squeeze the
plates together to make the vibration absorbers at and parallel with the plates.
Remounting servos is not recommended as they are pre-installed.
Instructions
1. Connect the left servo cable to the “L” port of the landing gear control board.
2. Connect the right servo cable to the “R” port of the landing gear control board.
3. Press and hold the SET button using a pin then power on. You will see a yellow LED beside the SET button
ashing quickly. Wait as servos complete position initialization.
4. Make sure the arm connecting to the servo is parallel to the link as shown in the following diagram.
5. Assemble the left and right servos to the left (between M3, M4) and the right (between M5, M6) parts of the
landing gear. Power off.
IN
R
L
To right servo
To left servo
To receiver channel
(To F1 port if use A2)
Connecting arm
SET Button
LED
Servo
Link
After Installation
Recalibrating Servo Travel
Instructions
1. Keep your hands away from all moving parts.
2. Ensure the “R”, “L” and “IN” connections are correct.
3. Keep the whole aircraft off of the ground during calibration, as landing gear will move.
4. Press and hold the SET button using a pin while powering on, then release. An LED will flash yellow
quickly. Press the SET button again. Auto calibration will begin and the LED will ash yellow slowly. DO
NOT obstruct any moving parts during auto calibration.
5. During calibration, the left landing gear will raise and lower, followed by the right landing gear.
6. After calibration, both the left and right landing gears will be lowered and the LED will display a solid green
light. This indicates that the landing gear is working properly.
If the LED is solid yellow after calibration, a problem has occurred. Carry out the instructions in
“Remounting the Landing Gear Servo” then try again.
Avoid obstructions during calibration. If the landing gear was obstructed, recalibration will be
required, per the above steps.
If the “R” and “L” servo cables are reversed, travel will not be measured correctly. Fix the
connections and recalibrate the landing gear using the above steps.
Landing gear travel has been pre-calibrated. Mechanical adjustment of the gear travel is not
1S900 Power Cord PlugS9020101, S9020102, S9020103, S9020104
34S900 Extended Landing Gear Leg S9033401
S900 Center FramePackage 3, 9, 12, 14, 15
S9012902, S9012903
S9013002, S9013003
S9013102, S9013103
S9013202, S9013203
S9032701, S9032702, S9032703,
(cheese)
M2.5×8
FCC Statements
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates, uses,
and can radiate radio frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. Operation of this equipment in a residential
area is likely to cause harmful interference in which case the user will be required to correct the interference
at his own expense.