Issue
Space temperature sensor calibration using the Xenta 102-AX plug-in
Environment
Xenta 102-AX Plug-In
Cause
The space temperature of a 102-AX can be calibrated in three locations:
- M/STAT, service menu OP > CSS, resolution 0.1°
- Vista Workstation, VAV_Controller.UCPTvavSelection.CSS, resolution as entered
- Xenta 102-AX Plug-in, Browser tab > UCPTvavSelection, resolution 1°
The first two allow resolution at least as fine as 0.1° step sizes on the offset. The LNS plug-in, however, by default only allows whole integer 1° step sizes.
Resolution
Read to the end before you try this. NOTE: It is recommended to make this fix prior to opening the plug-in on a VAV box that has already had the space temperature calibrated via the M/STAT. Failure to do so may result in the desired calibration being rounded to the nearest whole degree.
- From the Xenta 102-AX plug-in, select the browser tab (or open the LonMaker browser if you wish).
- Navigate to and expand the VAV controller object and select "UCPTvavSelection.CSS".
- Past all of the "CALIBR_NOT_ACTIVE" statements, you'll find a couple of numbers - the second one being 32. Raising or lowering this value will raise or lower the space temp by the same amount. But, until now, if you try to enter 33 or 31 you'll find that only even numbered integers are accepted. What to do?
- Open c:\Lonworks\types\user\TAC\Xenta100.fmt in notepad.
-
Locate line 172 which should appear as
UCPTvavSelection#US: text("%m,%m,%m,%d,%d,%d,%m,%m,%m,%m,%m", - Change the second "%d" to "%f" and save the file and restart the Xenta 102-AX plug-in. Now you can change that value in finer increments than is necessary.