Posted by Sandy Sound on August 25, 2014 at 4:54am
Hello everyone,I have a problem with my 3dr DIY Quad (running latest release) with mission planner 2 (Mac) setup with Taranis + X8R.Motor #2 does not want to play ball.With Pixhawk armed, prop does not spin like the others until a gentle throttle applied.At 40-50% throttle a beeping sound starts. It does not beep below that threshold.Copter wants to tip backwards when attempting take off.I have swapped ESC #2 with control to a different output on the pdb. No change.I have used a different ESC to drive the motor, no change.I have calibrated the ESC's "all at once" and manually calibrated ESC#2 with no change.You can see and hear the issue here:Is my setup problem ESC related?: http://youtu.be/EIIvVfpp2tA
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Got my replacement motor in the mail today. Have fittedand tested it and all seems well!
Hope to maiden tomorrow...
Thanks for your help and thanks 3DR for the awesome customer service! :)
Todd Bocik > Sandy SoundSeptember 2, 2014 at 8:08pm
Sandy,
What I thought was a replacement motor was the wrong size. I had to buy another. The good news is I got my motors today also! I did not have a chance to solder the bullets on them tonight. I will do it tomorrow. Unfortunately, tomorrow looks like rain all day. I will get the motor prepared and test. I will let you know how it goes.
Interesting. The place where I bought my motors and ESCs thinks it may be a motor also. I am going to replace the one I have (luckily I had a spare) and see if it is it. Unfortunately, replacing my motor takes a little time. I will keep you all informed. Keep your fingers crossed.
I am having the exact same issue. I have calibrated all the ESCs one at a time and have the same issue. I had another idea to try. The motor that is starting slowly is on output signal pin 2. So I decided to switch 1 and 2 signal wires.
The problem still occurred on motor 2. That means that the problem is not the Pixhawk and must be either the ESC or the motor.
Hi Todd, in the video above I have bypassed the Pixhawk and plugged the ESC direct to the receiver, it results in the same behaviour so I know it is not a Pixhawk issue. I have also tried a different ESC on the motor with the same result. I put a different motor on the ESC and it worked fine so I am concluding there is a fault with the motor.
Has anybody had this before and have a fix? If I don't have to send it back to the states it would be great...
Try calibrating all motors individually not all at once. I also see this once in a while on mine, but to be honest it is only at minimum throttle so when taking off it is never a problem. When you say the copter wants to tip backwards at takeoff you should check the balance of the weight distribution. If the balance is not centre of the copter then it will tend to tip at takeoff then stabilization will kick in. What you should really do is make sure in the design the weight balance is perfect around the centre point of the copter with the battery attached. This will give you a more stable and even takeoff.
Sandy Sound > Darren BoxerAugust 25, 2014 at 5:59pm
When you say "try calibrating all motors individually not all at once" are you referring to calibrating the esc?
I have done that already.
Motor #2 stops responding to more throttle once it starts to beep... so I believe the tipping back is related to a loss of thrust at the rear and not an unbalanced copter.
Yep, I'm having the same issue. Below a certain throttle level one of my motors is very slow while the other three are fine. I also did a calibration of all at once.
I will try removing the flight controller from the equation to see if the issue is there.
Replies
Hope to maiden tomorrow...
Thanks for your help and thanks 3DR for the awesome customer service! :)
Sandy,
What I thought was a replacement motor was the wrong size. I had to buy another. The good news is I got my motors today also! I did not have a chance to solder the bullets on them tonight. I will do it tomorrow. Unfortunately, tomorrow looks like rain all day. I will get the motor prepared and test. I will let you know how it goes.
UPDATE: 3DR have agreed it is a faulty motor and are sending me a replacement :) Thanks 3DR!
Interesting. The place where I bought my motors and ESCs thinks it may be a motor also. I am going to replace the one I have (luckily I had a spare) and see if it is it. Unfortunately, replacing my motor takes a little time. I will keep you all informed. Keep your fingers crossed.
I am having the exact same issue. I have calibrated all the ESCs one at a time and have the same issue. I had another idea to try. The motor that is starting slowly is on output signal pin 2. So I decided to switch 1 and 2 signal wires.
The problem still occurred on motor 2. That means that the problem is not the Pixhawk and must be either the ESC or the motor.
Has anybody had this before and have a fix? If I don't have to send it back to the states it would be great...
Try calibrating all motors individually not all at once. I also see this once in a while on mine, but to be honest it is only at minimum throttle so when taking off it is never a problem. When you say the copter wants to tip backwards at takeoff you should check the balance of the weight distribution. If the balance is not centre of the copter then it will tend to tip at takeoff then stabilization will kick in. What you should really do is make sure in the design the weight balance is perfect around the centre point of the copter with the battery attached. This will give you a more stable and even takeoff.
When you say "try calibrating all motors individually not all at once" are you referring to calibrating the esc?
I have done that already.
Motor #2 stops responding to more throttle once it starts to beep... so I believe the tipping back is related to a loss of thrust at the rear and not an unbalanced copter.
I will try removing the flight controller from the equation to see if the issue is there.
Thanks
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