Re: Q: 24V Line driver IC
Quote:
Originally Posted by
Robin Hewitt
If you are using opto couplers then your signal is current not voltage dependant and you are effectively proof against electrical interference.
If it isn't working you are barking up the wrong tree if you think screening and more volts is going to help.
Guess I didn't pay too much attention to the cabling, screening etc. Fact is that I get faulty signals from endstops if I run them at 5V without opto. Now I changed that to 24V proximity sensors and an opto near the BOB to ground the input pin. Now that's working.
So the stepper drivers 5V opto inputs Enable/Pulse/Direction. Those are wired single ended with common anode.
Just figured to go all in and use Line drivers where I can, and make it as stable a possible.
The MAX490 chip looks perfect, if I read the specs. right. Then it can drive an opto directly (20mA) ?
Thanks again, Bo Andersen.
Re: Q: 24V Line driver IC
How far from ESS to drivers? Unless it's more than a metre or so this sounds more like a ground loop issue than induced noise. Not convinced you're addressing the right problem.
Re: Q: 24V Line driver IC
Quote:
Originally Posted by
irving2008
How far from ESS to drivers? Unless it's more than a metre or so this sounds more like a ground loop issue than induced noise. Not convinced you're addressing the right problem.
Thank you for your reply.
From the ESS to the BOB, i would say <75cm, and from the BOB to the driver <50cm
So the ESS drives the Opto-LED on the BOB, which again drives the Opto-LED in the drivers. (This is coming from converting, from Par-Port, to the ESS)
Not sure if I can skip the BOB, and use the ESS directly to the Driver Opto-LED. But for convenience I kept them......
When you say "Ground-Loop" is that from the PE (Earth symbol) so all units PSU's, PC, VFD etc. to be grounded.
And/or
All the 0V pins on all PSU's: PC-PSU, 5-12-24-48V to have a common 0V
Right now all the PSU's are running without common 0V.
Best Regards, Bo Andersen.