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Found 2 results

  1. RLidster

    Pid And Pwm To Control Temperature

    Hi There I'm a bit of a novice and i am aware that parts of the title of this post are featured in a few others but i don't quite understand how to bring everything together with my example... My current setup is a; Temp probe (EI-1034) connected to a labjack U3 (AIN0) (channel = tempprobe) Solid state relay control set as dig out on FIO4 - (Channel = relay) logic low = off (0), Logic High = On (1) What i would like to do is power a heater using the SSR but use PWM and a PID loop to control the temperature of a box. I.e Vary the power to the heater by PWM of the SSR which in turn is controlled by a PID loop with the Temp probe and a temperature setpoint. Thanking you in advance! Best regards Rich
  2. I'm trying to use the PID to control a SSR. It needs to turn the SSR on and off based off of a Temp process variable. I have the PID Output Channel set to PIDOut. I then use sequence code to either send a 0 or 1 to the SSR channel based off of PIDOut. When I click on SSR channel and look at the values in the table, I can get it to alternate between 0 and 1, as it should by changing the set point in the PID. The SSR channel is in DAC0 and the corresponding Vs, but the SSR remains powered. It will not turn off with a value of 0. What am I doing wrong?