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shawn asked How to hook a PID to a freezer?
And got the following answer:
Assuming you want to connect a simple PID controller to a refrigeration/freezer unit: 1. Acquire the PID temperature controller. 2. Acquire a suitable temperature sensor, such as an RTD or thermocouple. 3. Acquire a suitably rated electrical power switch or relay that your controller can use to turn on/off the compressor. 4. Temperature sensor connects to the PID controller on the 'input' port. 5. Relay and/or switch connects to the PID controller on the 'output' port. Be smart when wiring relay/switch to the compressor. 6. Control power is applied to the controller. 7. Smarts (engineering knowledge, perhaps?) are applied to the P, I, and D settings of the controller. 8. Warm beer is placed in refrigeration unit. 9. Time elapses while the control setpoint is reached. 10. Success is declared when cold beer is extracted from refrigeration unit. Spend some time looking around on automationdirect.com They have some good, basic control examples. Edit: The question wasn't whether a PID was the optimal controller to apply, but rather how to apply it. Proper tuning of a PID could yield some improvement in response over a bang-bang control, or the PID could be tuned to mimic the simpler control method. Either way, it is a valid question, and is the start of how one learns to apply controllers....by practicing.
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