Mulberry
USA
Asked
— Edited
Resolved by Rich!
Afternoon All
I'm stumped.
I'm trying to make a connection with a non-EZ GWS servo but am having no luck. I've tested the EZ with standard servos that came with the kit and they function fine. This GWS is rated at 4.5 volts to 6 volts and I've tested it at these and even lower. The port is correct, the board is properly selected, I restarted the EZ, insured I have the latest version but still get no movement or indication a signal is reaching the servo. It doesn't appear locked because I can turn the gears by hand. I'm hesitant to take it apart just yet.
Any suggestions?
Thanks,
Daniel
@Steve - In parallel increases current. Series increases voltage
@Rich.
Oops, that's what I meant. Honest.
(Corrected post above)
@mulberry.
As you said in an earlier post that you wanted to power your robot off a mains supply, a bit of searching found a mains power supply that has variable voltage, and can provide a continuous current up to 20 amps. And it's not a bad price either.
9imod.com/index.php?main_page=product_info&cPath=77_92&products_id=1138
Steve just curious. How would this be different from a workbench power supply like the one below:
BenchSupply
@Mulberry ... There is a huge difference... Your bench supply is rated at only 2 amps, Steve's is rated at 20 Amps. 10 times more power... 2 amps is not nearly enough to run a project with servos....
@Mulberry, the image indicates it's only a 2A supply. This is enough to operate a single, heavy duty servo like the Tower Pro under about 75% load. Inrush current will be more than 2A.
I haven't read all posts but presume you are trying to run something which pulls a lot more than 2A.
To put it in perspective, the revolution robots (JD, Six & Roli) need a 20A bench supply. A B9, with larger motors and servos will need more than 2A for sure!
Ah. Slowly sinking in
I had planned on a bench supply to feed all systems but the one I have is only 2 amps so I need 20 amps even if the big guy is not mobile. I'll check what I have at home. I have two large 12 volt rechargeable hobby batteries but I don't know their amps as well as two power systems I purchased last year on recommendation from another B9 builder.
Everyone's advice is much appreciated. I'm a research psychologist with no electronics experience except what I've picked up. And clearly a little knowledge can be dangerous
Daniel
You may need more than 20A. It depends what you are trying to run.
Work out the inrush current for everything that you are trying to power. That is the minimum current you need to supply. To do this count up the number of servos, number of motors etc. Multiply the number of servos by their inrush current. Multiply the number of each type of motors by their inrush current. Add everything together and that's the amps to aim for.
For instance, if you are running 3 servos with an inrush current of 4A, 2 motors with an inrush current of 5A and one motor with an inrush current of 3A... 3 x 4A = 12A 2 x 5A = 10A 1 x 3A = 3A Total inrush current is 25A.
If the power supply cannot provide the amount of current required it will cut out.