Hi!
I have this psu on my mini cnc machine.
Unfortunately I realized a problem on my machine.
The drill motor is so to say "jogging" when I try to start the motor. Then I have to stop the motor and again try to start and so on so forth until it starts to spinning as it should.
The motor is a 24VDC motor. On a simple PCB fabricating the current never goes over 1A, just on the startup, then it will rise up to a bit over then 2A.
The PSU is a 24VDC/4A.
After checking around the control board of my cnc I found does the PSU is for some reason the problem. It will cut out the power from the motor and then power on and so every maybe 1sec and it looks like the motor is jogging. Start/Stop/Start/Stop....
I checked the whole PSU and didn't found any problem, it is a crap from china I'm realized that very quickly, but it was worked almost a year.
When it starts to deliver enough power to the motor and the motor spins up then there are no more problem,
even under heavy load.
What I suspect are 3 cap's 330uF/35V even if I checked them with ESR meter.
They are in parallel on the output of the PSU and feeds into the motor so to say.
They are for sure no some sort of filters etc. They must act as a buffer or so.
I think my PSU act's like if the output is in some short.
I checked the motor with another good PSU and it works like a charm.
If some caps is in some sort of short then it would cause a power fall out I suspect.
Can somebody prove my theory?
Or is there maybe something other in problem?
Check the pictures.
You will see on the PSU-PCB1.JPG left side are 3 caps, they are the cap's I think are bad.
The little chinese cut the wires first and then soldered them back to the pcb, they realized too late does one pad of the wire is nowhere connected
.
Thank you very much for any suggestion.