Originally Posted by AussieMatt  I want to also change from my 4x 48V 7.5A(output) PSUs to one or two larger PSUs (on a project I have yet to finish...)
I have 4x 900W(peak) Servos that this will be suppling power to through DMM-Tech control gear.
I haven’t talked to the Hui at DMM-Tech for a while but will pose the question to him as well, but thought it would be good to put it up here with your post as well.
Note: he was meant to give me three of these PSUs but gave me 4, which still seems underpowered for the system, I don’t want one axis to be underpowered at any one time while waiting for the others to move….
I am a little rusty on this power conversion as haven’t been working with it for a long time (project has been put on hold far too long), and was wondering which side to keep constant in the upgrade, the amps or the volts or does it matter at all?
Cheers |
AM,
I'm surprised--after all these years--to find myself reading posts from my younger self (who I must say, seems much more informed than I...).
Taking my own post as a hint, I guess that I would look up the specs on the servos, find the voltage it's going to run at, see the maximum current it's going to draw at that voltage, multiply by four (4 servos), and find a PSU that outputs that much current at that much voltage.
Power (in watts, W) is just voltage x amperage.
If you have a 48V supply, your 900W servo needs 900W/48V > 18A (peak). However, if you found a 100V supply--AND they were designed to work at that voltage--they'd need only 9A.
Maybe you could put a clamp-ammeter (clammeter?) on one to test it's draw and see that it's suck 7.5A (should blow a breaker if it tries to draw more than rated current from the PS).
Does seem a little underpowered to me, but "Golly, Batman, do we really NEED 4 KiloWATTS for this project?!"
Turning over and going back to sleep for another 8 years...
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Czzzzzz