I see that the driver is mounted on a breadboard.
Since breadboards can't carry motor current, the contacts to the motor and/or the power supply may be intermittent, if they work at all.
Disconnecting a motor (or an intermittent motor connection) while the driver is powered will instantly destroy the driver.
Robin2:
Not necessarily "first" as it is connected in parallel. The capacitor is not a protection device.
I got it.
How do you suggest to connect the power supply?
Thanks,
Devika
jremington:
I see that the driver is mounted on a breadboard.Since breadboards can't carry motor current, the contacts to the motor and/or the power supply may be intermittent, if they work at all.
Disconnecting a motor (or an intermittent motor connection) while the driver is powered will instantly destroy the driver.
So you are suggesting to solder all the connections and get rid of the bread board. Am I right?
devika9:
How do you suggest to connect the power supply?
I don't understand why that question is a response to my Reply #17.
What exactly is in your mind?
...R
Hello Robin,
I understood what you explained in reply#17.
My question was for your reply in #15, where you suggested that the power connection might be in wrong way around. I tried to switch the power supply terminal and then my capacitor got damaged every time. Because switching power terminals, the negative terminal of the power source connects with positive terminal of the capacitor and led to the damage of the capacitor. As the present connection didn't damage my capacitor because the negative terminal of the power source is connected to the negative terminal of the capacitor. so I thought this is the right way. But in reply #17 you explained that even if the capacitor don't damage that doesn't means everything is fine.
In reply #21 I am asking to how should I make the wrong connection right.
Thank You,
Devika
Thanks.
Your power supply is capable of supplying 50 V but the A4988 has a max of 35 V . Just guessing here.
Hello justone,
The regulator on the power supply helps me to adjust the power supply to 19V-20V.
Thank You
Devika
Took a closer look at your closer picture of the driver board to see what let out the M.S. and did not see anything that stood out but it looks like the ground lead of the electrolytic is blackened.
Maybe the cap is what let go. You might be lucky.
devika9:
My question was for your reply in #15, where you suggested that the power connection might be in wrong way around. I tried to switch the power supply terminal and then my capacitor got damaged every time.
I intended you to check the connections with the writing on the terminals or with a multimeter.
It never crossed my mind that you would deliberately connect it up the wrong way as part of your checking.
...R
Robin2:
It never crossed my mind that you would deliberately connect it up the wrong way as part of your checking.
I checked that before my driver got damaged. I played around it a bit to learn.
I initially thought the reason of the driver damage could be the code, because in my code the motor is taking one step every 3 second and due to this the driver as well as the motor heated up . So I thought, as the driver has to hold the current for longer time before sending it to the motor this resulted in over heating and ultimately damaging the driver.
But, that doesn't make complete sense because the voltage supply is 19v and the current generated ranges from 0.4 Amps.-1.8 Amps. which is within the capacity of driver.
other thing I can think of is that as the driver was some china made stuff so it might be not as good as Pololu drivers.
Thanks
devika
The driver and motor should be fine even if you only took one step per year.
...R
devika9:
other thing I can think of is that as the driver was some china made stuff so it might be not as good as Pololu drivers.
It could be anything at the moment. If you get a different kind of driver.... but connect it all up in the same way, and if it never happens again, then that'll be great. And then, could switch back to the same model/device/batch of A4988 driver (with fire extinguisher on hand)....and if it happens again (ie. bursts into flames), then could home in on the issue.
