irondesk40
Member
go to work on this again this morning. I have attached the file and have a question that i can not figure out.
When monitoring the temperature i see the value from the thermocouple card. For example if it is 90 degress F, it shows 90 degrees F. But watching the screen on my laptop when i raise the setpoint to turn on the heater to reach the new setpoint i watch the value from the input of the thermocouple card and it shows it rising. For example if i go from 90 to 110, i see it changing from 90,91,92,93 etc., but i also see the value go to a wild number such a 120 or even a different number but then goes back to showing the actual increasing of the temp. it is just a heater element hanging in the air at the moment and a j thermocouple mounted and touching it. Any thoughts why i would see this happen. I know there is a lot i do not understand about PID loops but trying to learn as much as possible.
thanks
When monitoring the temperature i see the value from the thermocouple card. For example if it is 90 degress F, it shows 90 degrees F. But watching the screen on my laptop when i raise the setpoint to turn on the heater to reach the new setpoint i watch the value from the input of the thermocouple card and it shows it rising. For example if i go from 90 to 110, i see it changing from 90,91,92,93 etc., but i also see the value go to a wild number such a 120 or even a different number but then goes back to showing the actual increasing of the temp. it is just a heater element hanging in the air at the moment and a j thermocouple mounted and touching it. Any thoughts why i would see this happen. I know there is a lot i do not understand about PID loops but trying to learn as much as possible.
thanks