PDA

View Full Version : Johnson Slide Setpoint for FX07

#1servicetech
01-04-2008, 06:05 PM
has anyone gotten the slide input for johnson thermostats to work in an FX07?

mechdorn
01-05-2008, 10:00 AM
For the warmer/cooler adjust the AI object's attributes should be set as Temperature, 0-10 volt, High Range = 15, and Low Range = -5.

For the Setpoint adjust the AI object's attributes should be set as Temperature, 0-10 volt, High Range = 115, and Low Range = 55.

Set the limits slightly higher and lower of the range settings.

#1servicetech
01-05-2008, 12:12 PM
Thank you. This saved me alot of experimentation :)

iraklisn2
01-07-2008, 02:49 AM
For the warmer/cooler adjust the AI object's attributes should be set as Temperature, 0-10 volt, High Range = 15, and Low Range = -5.

For the Setpoint adjust the AI object's attributes should be set as Temperature, 0-10 volt, High Range = 115, and Low Range = 55.

Set the limits slightly higher and lower of the range settings.

Ηι mechdorn,

could you tell me also the manual fan speed adjust for FX07

Thanks

carismatic
01-08-2008, 08:28 AM
You must writing your program according a curved.

For example:
115=100
100=90
80=79
:
:
:
55=00

anyway.....

ctremblay
01-08-2008, 10:23 AM
We use a serial resistor (1467ohms) in serie with the Metastat potentiometer (760Ohms). 1467 ohm is theory so chose something near that.

With a 15VDC source connected both side of the pot AND the resistor, it will give you a linear result 0-5VDC (to each side of the pot) that you can define into the FX07. (only 0-10VDC can be chosen, but set your range to fit a 0-5VDC)

Note that we use a 0-5VDC range to be sure that the voltage will not go over 10VDC... By time, we know that those controllers will fall to 0 if the input is greater than 10VDC. And we cannot be sure than the 15VDC won't be 15.7 for example)... We also do that for pressure transmitters that will often bust 11VDC ...

If you want a +/- setpoint, don't forget to use a diff_Temp (or a count) variable when you define the input.

iraklisn2
01-08-2008, 11:57 AM
Thanks

mechdorn
01-08-2008, 09:04 PM
Iraklins2 is correct about the Temp-Diff setting on the W/C adjust attribute setting, I missed it when I replied, sorry about that. As far as the 3 speed fan, do you have any of the JCI canned Express files for the FX07? If so, select a 3 speed fan and export the application. Then check out the FX Builder program for the fan, The Plug-ins can be difficult to backward engineer because of the FX Express choices and the LON profiles. They can also can be very educational, especially for the PLC logic programming.