Group, The primary controller issue is too little reset because the integrating capacitor is too small or bad. After that comes too much gain.
Power lead resistance would reduce the gain. Conversely, high voltage would increase gain. Don't think extra insulation is a stability issue, unless it's between the heater and the sensor. One other thing - dead time will destabilize the control loop, when there's too much delay between the heater's heat being sensed by the thermistor. This is usually a location problem. Bill Hawkins (50 years in industrial process control) -----Original Message----- From: Bob Camp Sent: Wednesday, October 13, 2010 5:58 AM Hi Controller cycling is often a result of one of two things: 1) Resistance in the power lead 2) Extra insulation / dead air 3) Internal controller issues There are a few other possibilities, but they are remote enough that you are unlikely to ever come across them. There's no advantage to building a controller that's cycling. It was more likely a bug than a feature. Bob _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
