I'm looking for any tips, gotchas, or examples people might have related to 24VDC distribution over longer distances to power a remote I/O panel.
Distances are ~200ft and my estimated load at the remote I/O panel is ~7A of 24VDC (my rough estimate to power some bigger solenoids, plus ethernet switch, Eth I/P adapter and Point I/O, then the 4-20mA circuits and discrete I/O)
Brief overview of my system, will have one main control panel with Controllogix and 3 remote I/O panels with AENT adapters to Point I/O. To simplify conduit runs and reduce shock hazard at the remote panels, the plan is to have the 120VAC to 24VDC power supplies in the main panel and then run ethernet and 24VDC in same conduit out to each remote I/O panel. I figure since it's low voltage DC, then it should be OK to run those two lines in the same conduit.
My main concern is if I will have to worry about voltage drop at the remote panels. I used an online drop calculator, and keeping it <2V over 200ft looks like I need at least 8AWG wire, which seemed a bit big to me. Figure I could goose the 24VDC up a bit if I have issues, plan to use AB 1606-XL series and I think you can adjust those up to as high as 28V if you derate the current a bit.
Has anyone done something similar? Would it be better just to have them pull 120VAC to each remote I/O panel in a separate run?
Any advice appreciated,
-radfahrer
Distances are ~200ft and my estimated load at the remote I/O panel is ~7A of 24VDC (my rough estimate to power some bigger solenoids, plus ethernet switch, Eth I/P adapter and Point I/O, then the 4-20mA circuits and discrete I/O)
Brief overview of my system, will have one main control panel with Controllogix and 3 remote I/O panels with AENT adapters to Point I/O. To simplify conduit runs and reduce shock hazard at the remote panels, the plan is to have the 120VAC to 24VDC power supplies in the main panel and then run ethernet and 24VDC in same conduit out to each remote I/O panel. I figure since it's low voltage DC, then it should be OK to run those two lines in the same conduit.
My main concern is if I will have to worry about voltage drop at the remote panels. I used an online drop calculator, and keeping it <2V over 200ft looks like I need at least 8AWG wire, which seemed a bit big to me. Figure I could goose the 24VDC up a bit if I have issues, plan to use AB 1606-XL series and I think you can adjust those up to as high as 28V if you derate the current a bit.
Has anyone done something similar? Would it be better just to have them pull 120VAC to each remote I/O panel in a separate run?
Any advice appreciated,
-radfahrer