We have a mid size school district with six schools which are predominantly Automated Logic.
I’m currently working on a project replacing 7 Mammoth Multizone rooftop control packages.
The larger units have up to 12 zones, 36 UI 6 DO 16 AO.
Using a T3-8o to test bench the setup using a ALC router to Bacnet/MSTP.
Funny issues with the T3-8o. If I use the T3000 software over Ethernet, the MSTP network
stops communicating and the device shows as offline. Makes it a little difficult to change IO
config and confirm at the same time.
Another issue is the BAPI t’stats that exist on the job. 3 wire 10k-2 with warmer/cooler sliders. Try as I might, sharing the common from the sensor and the slider doesn’t seem to work. The T3 just reads 0. The slider is 15k to 35k. Using a meter, I see that every Space temp scan on the input brings the reading to a direct short on the slider input.
Sharing the common doesn’t appear to work. I’m looking for any input on how to accomplish this with the existing 3 wire system.