system
April 23, 2015, 11:26pm
1
I'm hoping that somebody may be able to help with this issue.
I have an uno R3, prontoneer v3.00 grbl shield, 4 * A4988 drivers, 3 Nema17 motors.
I connected my 12v power supply, all works fine, but no torque in the motors,
So I purchased a 24v 15a psu from off ebay, connected it up and all hell broke loose.
The capacitors inside the psu connected to my usb hub exploded, the usb hub got extremely hot and the A4988 driver were screaming.
Anybody any ideas as to why the 24v psu would do this, especially when it's recommended.?
DrAzzy
April 23, 2015, 11:41pm
2
How was it connected?
From the sounds of things, somehow the +24v got onto Vcc (which should be 5v), and from there, as you said, all hell would break loose.
Hi,
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
Tom.....
Robin2
April 24, 2015, 6:34am
4
A4988s are well able to handle 24v so you must have connected something incorrectly.
Draw a diagram of how you had everything connected and post a photo of your drawing. A photo of the hardware is not suitable.
Post a link to the datasheet for your motors
Did you correctly set the current limit potentiometer on your A4988 boards?
...R
Hi, I think he hooked the 24V up to everything, including the arduino.
Tom..
Paul_B
April 25, 2015, 11:31am
6
itwhiz:
I strongly suspect inability to read the instructions ! (7 , 9 and 11 )
Simplest killer: reverse the polarity of the power source :-]
