Re: Positioning Block Detectors for AIU-01
Vollrath, Don <dvollrath@...>
The occupancy detectors like the BD20 want to be in relatively close proximity of the track sections being monitored. The output of the BD20’s are low level circuits and subject to electrical noise. But the NCE AIU talks to the command station via the cab bus. And the length of the cab bus back to the PowerPro command station is not that critical.
I would place each AIU unit somewhat centrally located around the cluster of BD20’s it is monitoring, and simply route/wire and daisy chain the cab bus to each AIU.
If you find that there is 1 or 2 BD20’s that end up being remotely mounted from its monitoring AIU, use a twisted pair to wire it back to the AIU to minimize interference. [The BD20 really doesn’t need a power supply for operation. The power supply is there to only light an LED if you think you need it.]
From: WiringForDCC@... [mailto:WiringForDCC@...]
Sent: Thursday, November 12, 2015 5:10 PM
Subject: [WiringForDCC] Positioning Block Detectors for AIU-01