Hi,
i'm a pretty much a mechanical engineer but I'm putting together a control package for a precision mechanical stage.
The short of it is i'm trying to figure out good guidelines to acceptable wiring lengths in encoder lines.
The long of it.
I'm using linear encoders that output 1VPP waveform.
That will go into a quadrature interpolater about 1m away.
5-12+ meters away will be my control cabinet. (still figuring out how far away it will be). I will run the encoder lines into the control cabinet in twisted pair shielded cable with differential signals. The encoder lines will run onto a breakout board which will split my line into my controller (inside the cabinet) and to a U.S. Digital encoder display ~3m away from the cabinet. (Currently just a shielded 37pin dsub cable for my 3 encoders with differential signaling).
The only real guidelines I can find are that anything over 6ft should be differential lines. I will have 3 low power stepper lines (Nema 17) in my system, but in their own shielded cables. I'm not sure if the line length will be too long (~15m + interconnects) for noise reasons
Bonus Points. Should the encoder be able to supply enough power to signal both the controller and encoder display?
Manufacturer (Heidenhain) was fairly unhelpful (try it and see, which honestly if I have to buy new cables/interconnects/breakouts/filters at the end of the project will make me lose money, before that and I can charge my customer)
i'm a pretty much a mechanical engineer but I'm putting together a control package for a precision mechanical stage.
The short of it is i'm trying to figure out good guidelines to acceptable wiring lengths in encoder lines.
The long of it.
I'm using linear encoders that output 1VPP waveform.
That will go into a quadrature interpolater about 1m away.
5-12+ meters away will be my control cabinet. (still figuring out how far away it will be). I will run the encoder lines into the control cabinet in twisted pair shielded cable with differential signals. The encoder lines will run onto a breakout board which will split my line into my controller (inside the cabinet) and to a U.S. Digital encoder display ~3m away from the cabinet. (Currently just a shielded 37pin dsub cable for my 3 encoders with differential signaling).
The only real guidelines I can find are that anything over 6ft should be differential lines. I will have 3 low power stepper lines (Nema 17) in my system, but in their own shielded cables. I'm not sure if the line length will be too long (~15m + interconnects) for noise reasons
Bonus Points. Should the encoder be able to supply enough power to signal both the controller and encoder display?
Manufacturer (Heidenhain) was fairly unhelpful (try it and see, which honestly if I have to buy new cables/interconnects/breakouts/filters at the end of the project will make me lose money, before that and I can charge my customer)
