I am a BACnet newby. I am experimenting with Setting up a T3-TB-11i with an single Invertek VFD. While trying to learn your system.
The Building view shows the TB then Default Building then the OPTIDRIVE in Red
When I click on configuration display I get a message "This device doesn’t have a configuration display.
I cannot get them to talk. However the TB does recognize the VFD on the tree.
So I’m not sure what to do.
One question is: Do I need a 120 ohm terminating resistor on the VFD? Do I need a terminating resistor on the TB?
My wiring is negative to negative, positive to positive, common to common, I do not have a shield,
I have a 120 ohm resistor at the drive positive to negative, I tried to put one on the TB but had no luck either.(do I need this?) The cable is 5’ long.
The VFD is a third-party device that you can check using Yabe. Make sure the VFD is set to the same bacnet protocol, baud rate of the T3 subnet. Also ensure it has a unique bacnet instance ID. Once you have communication on teh subnet you can use Yabe, go to T3000 → Tools → BACnet Tool. Check around the forum for some examples of how to use Yabe in this forum.
T3000 provides limited information about third-party devices, only indicating that they are communicating by displaying them in the device tree. We plan to include common BACnet objects, such as inputs and outputs, in future updates.
In your case, the termination resistors will have minimal impact since your cable is only 5 feet long.
You can use a simple program to display some of the VFD objects, create trend logs, and implement logic. For example:
10 VAR1 = 535353AI1
In this line, VAR1 is the local global variable on the TB, 535353 is the BACnet instance number of the VFD, and AI1 refers to the first analog input object on the VFD.