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Velox F7 V50A SE HD Stack installation instructions and precautions

Jun 28, 2024 HuYuan

If you have a good chance to get a new Velox F7 V50A SE HD stack, and want to build it with your drone, then don’t miss out the installation instructions and precautions.


What frame is suitable?

To install this stack, first we need to choose a suitable frame. This stack mounting hole is 30.5x30.5mm, so the frame you can consider some 4-8" freestyle or cinematic X4 or X8 frame. In this bolg we just for example the 5" freestyle frame.


How to install the stack on the frame?

Compare the dimensions of the stack and the frame in advance to see if it reaches the top of the frame. After confirming the installation position, connect the FC and ESC with connection cable. Pay attention to select the appropriate cable sequence, VBAT, GND, CUR, TLM, Motor#1 2 3 4, then align the sockets and insert them.

The next step is to install the shock-absorbing washers, making sure that the stack won’t touch the carbon plate. And that there is a certain margin at the bottom, then pre-tin the ESC pads and wires.

After cutting the wire to a suitable length, solder the capacitor and power cable, choose the appropriate voltage output for camera and VTX, solder them. Also select whether to solder the PIT pad, like here our camera uses 5V output, we solder the 5V pad. We need 10V output for VTX, solder the 10V pad. We need to enable the VTX PIT function, so we also solder the PIT pad. For clean build, we can rotate the flight control and ESC connect cables and twisted them together, then install.


How to connect VTX, camera and LED?

Connect the VTX and the camera's connection wire as needed. Select the corresponding uart to solder the receiver, or directly plug in the receiver, LED light strip and other electrical equipment. Here we choose to connect to FT800, a analog VTX. All connected with cables, find the corresponding wiring. Check whether the cable color is consistent with the pin definition: Power, GND, Video in, Camera control, Receiver 5V, GND, RX3, TX 3, VTX, Power, GND, Video out, RX2 TX2. Since it is an analog VTX, you can choose not to connect RX2 here. If we want to connect HD VTX like DJI O3, we are equipped with O3 cable, which can be directly plugged into our HD VTX port with DJI O3.


If you need to connect LED light strip, maybe you can choose LED lights with cables. To make a connection, check whether the color is consistent with the output line sequence: 5V, GND, LED.


Connect cables for VTX, camera and receiver, strip wires and tin, the receiver and VTX are all have pads, we can just solder the cable to the pad. As for camera, cameras with soldering pads can be soldered directly, but most cameras don’t have, then need to use the camera cable to connect. For VTX, red one is power, black one is GND, yellow one is VIDEO, VTX connects to TX port, the corresponding one is blue. About this extra wire, we can pick it out, or use heat shrink tubing insulate it.


After soldering, we can check again the corresponding pin definitions on both sides to check if right or not. After correcting, we can twist all the wiring together, so It won't be messy. Fix the VTX on the carbon plate, check whether there is a short circuit between the VTX and carbon plate. Install the antenna adapter, plug in the connector, check whether the adapter cable and antenna pinhole are consistent. Receiver soldering is the same as VTX, Black one is GND, Red one is 5V. We can see the blue one is the RX3 port of the flight controller, connect to the TX port of the receiver. Green is the TX3 port of the flight controller, connect to the RX port of the receiver. After soldering, we also twist the cables together.


Put the heat shrink tube on the antenna, if the antenna is very long we can fold a little bit inside. Check if our cable length is appropriate and there must be a certain margin, won't be dragged along. Wrap acrylic tape around the receiver, choose a good location to fix. We use a zip tie, fix the receiver and VTX together, so they won't shake. Install the receiver antenna into the corresponding hole. Next, solder the camera cables. Cameras generally use plugs, we choose the camera plug to connect with our camera cable. Don’t forget to put on the corresponding heat shrink tube in advance. Red corresponds to the red positive electrode, black corresponds to the negative pole of black, yellow are all video signal cables. Generally, the camera’s parameter adjustment cable is white, which is also the outermost one. It is connected to our blue camera parameter adjustment cable.


Of course, if you use the parameter adjustment board, or the camera has been adjusted, there is no need to solder this wire. After soldering, we check whether the solder joints are secure. Push the heat shrink tube to the appropriate position, twist the camera wires together.Connect camera

Check whether the line sequence and definition are consistent, LED lights are generally plug-in, we just need to check its pin definition whether it is consistent or not. If inconsistent, you can lift up the pins of the LED cable, just pull it out and swap it out.


Install motor

After arranging the internal components of the frame, it’s time to install motors on the frame. Measure the distance from the motor to the ESC and cut off the excess wire, pre-tin the motor wire and solder it to the motor pad on the ESC. After soldering the motor wires, spin the motors by our hand and check whether the rotation is smooth. If there is a stuck spin, it means there is a short circuit.


Components check

We can unplug the connecting cables between the camera, FC and ESC. Check whether there are tin beads on the FC and ESC, use a brush to remove tin slag from them.



Installation nut, when installing the nut, we can gently press the stack. Finally, check whether the stack is installed horizontally, securely and without loosening. Arrange the wire harness, keep it from crossing the flight controller. Use a short circuit protector or multimeter do a final check. Make sure there is no short circuit in the power interface of the electrical equipment, the top plate of the frame can be installed.


Of course we also have the video tutorial of this, please check this link: https://www.youtube.com/watch?v=hDlQ4q09te8&t=227s

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