Tony Stuart said:The only requirement for PID loop is to prevent overshoot.
Actually all PID controllers have limits and thus are nonlinear meaning full power is applied if error >XThe use of PID also makes the setpoint and measured value agree.
With P, they don't at all
With PI, they do, but might have overshoot
With PID, it;s likely overshoot can be controlled.
In an analog controller P out is limited by the power supply rails or a control. Eurotherm implemented the Maximum output of the output of the error amplifier".Tony Stewart said:Actually all PID controllers have limits and thus are nonlinear meaning full power is applied if error >X
Hi KISS,
It sounds like you have far more experience at temperature control than I have. I have not played with Peltier effect devices but I can see it could be an advantage to be able to cool as well as heat just by reversing the polarity with the set point only about 3 Deg. C above ambient.
Les Jones said:I initially thought it might be possible to use one of the small DC to DC converters that are designed to provide an isolated supply as a means of using the salve input on the DC power supply to switch the output on and off but I don't think the open collector would be capable of driving even a 1 watt version. (I think the output is limited to about 20 mA as the PID unit has an internal 790 ohm current limiting resistor and recommends a minimum load of 500 ohms. With the 27 volts open circuit voltage that zexclo measured the current works out to about 20 mA.)
Les Jones said:I think zexclo needs to specify the tolerance of the target temperature. It seems on this sort of forum one of the main problems is defining the question accurately.
a) GPS-3030 is not pulse controlled but linear control 0~10V for 0~100% of Vmax for the supply.Hi,
I would like to seek some assistance on connecting my PID controller to my DC power supply.
I am currently making a temperature regulator using
1. WATLOW controller model ( 982C-25CC-KRGG)
2. Lightbulbs (Philip Halogen 50W, 12V lightbulb)
3. GW DC power supply (Model GPS-3030)
I am encountering some difficulties connecting the controller to the DC power supply.
From my learning,I understand that the controller is a PID controller, which sends pulses to the DC supply which in turn will power up the light bulb should the temperature drops what is needed to maintain.
However, I am having difficulty understanding and connecting the PID controller. As to should the setting of the power supply be set to master output? and how should the circuitry be connected.
For any kind assistance!
the OP said:In response to post#22 I am currently making an incubator for some running tubes. This temperature regulator will be used to keep the air in the tube to be 25 degree Celsius, as the surrounding outside(environment is around the box is about 22 degree Celsius). My project supervisor wants to use the PID in the setup, as the results are used for research purposes.
Hence, the heating mass is generally air in the box.
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