| ??? 11/02/09 09:14 Read: times |
#170329 - What kind of heaters have you tested it on ? Responding to: ???'s previous message |
There is a wide range of heating systems available. I am saying "Heating Systems" and NOT "Heaters".
System means "MaterialToBeHeated + Heaters + HeaterWires + SensorPlacement + SensorQuality + SensorWires" There are systems that raise the temperature by 100 Deg.C within 3 Seconds, there are systems that take 1 hour to raise the temperature by 2 Deg.C. So what was the speed of temperature rise when you tested it. And what other speeds have you tested this controller ? My experience says that one logic of PID action works on fast HeatSystems, but it does not work on SlowSystems. Is your PID algorithm tested on all these systems? Just by changing the P,I,D values do not work, you might have to change the PID algorithm itself. On each above HeatingSystem, set the SetTemperature=100 Deg.C. How much time does it take to reach and settle (both are different) at 100 Deg.C. ? How long does it stay at 100 Deg.C. ? What is the accuracy of the PID Controller ? +/- 1 Deg.C.; +/- 2 Deg.C., etc. Does your controller have the option of RTD Sensor with 0.1 Deg Resolution. How is the performance of PID Algorithm when resolution is 0.1 Deg.C ? Customer will not care if your CPU has run out of memory. He wants features and Optional features. |
