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Nigeria
Asked — Edited
Resolved Resolved by DJ Sures!

Over-Heating Servo

how can I stop the vertical servo motor from humming and over-heating?
I have a JD revolution kit, and have been using for about a few weeks now.
on one particular occasion of my interaction with the robot, I noticed that the vertical servo motor wasn't working, I discovered that it was humming and over-heating. The servo motor immediately burnt out then.
I was lucky to have a spare JD head available, so I installed it. But the I discovered immediately after connecting to the robot, that the vertical servo on the head was permanently rotated to the extreme position, on its own and it was humming/heating up. I then unplugged the particular servo from the controller to prevent it from burning out.
I have tried using other computers to connect with the robot even to the extent of downloading the ARC all afresh but the defect still continues.
I am suspecting that the fault is from the controller. Please I need urgent assistant to salvage this problem.

Thanks, as I look forward to your kind your assistance

PRO
Synthiam
#1  
Sounds like the head vertical servo requires physical calibration of the component. The latest mini servo version are actually HDD and do not hum and have higher degree of resolution - you may consider upgrading.

If a physical calibration helps, you can find that information on the learn section in the maintenance for your product. Here is a direct link: https://www.ez-robot.com/Tutorials/Lesson/-1?courseId=1&sectionId=3

Look under the head servo calibration activity in that link.
#2  
still unresolved.
I even replaced the head with another one I have available but the situation still persists. The particular servo doesn't respond to servo calibration, it just keeps humming and heating up; rotated to the extreme, despite it that it was replaced by another one. So I kind of perceive that it's that particular port on the controller that has issues.
There are also some other challenges that are unfolding. The ankle and knee servo's keep shaking and when ever the robot is connected with the computer.
PRO
Synthiam
#3  
The latest mini servo version are actually HDD and do not hum and have higher degree of resolution - you may consider the servos. Contact Us to request an HDD upgrade kit for your JD humanoid.

#4  
If the servo is deflecting to an extreme position it may be a change in the code. Try running the default project and operating that Servo. As well, ensure the servo is plugged in correctly, in the right port as listed in the project.

As well, you could try changing the servo to another port if available. Change the port in the software if you do.
#5  
thanks for the link on manually caliberating the vertical servo on the heads. It worked out.
But the other issue of the left knee servo that keeps oscillating back and forth on its own is still unresolved. I did the manual calliberation and even when the bracket for attaching it to the body was removed while I have set it to 90 degree position, it did't remain there, but kept oscillating on its own. The way this happens is that the motor shaft would rotate forward a bit(like say 2 degrees) then backwards and it goes back to stationary. But this cycle repeats frequently like say two times per minute. This makes the robot unstable and mostly fall off each time it's in operation.
#6  
The other issue of the left knee servo that keeps oscillating back and forth on its own is still unresolved. I did the manual calibration and even when the bracket for attaching it to the body was removed while I have set it to 90 degree position, it did't remain there, but kept oscillating on its own. The way this happens is that the motor shaft would rotate forward a bit(like say 2 degrees) then backwards and it goes back to stationary. But this cycle repeats frequently like say two times per minute. This makes the robot unstable and mostly fall off each time it's in operation.
PRO
Canada
#7  
Hello @Erhijivwo

If the left knee servo is labelled as HDD, it sounds like it has a potentiometer issue. If so, please use the Contact Us page and reference this forum thread.