FULTON VSRT Series Installation, Operation And Maintenance Manual page 53

Fulton Ltd
3. Pressing the ↓ will display "I."
4. Pressing the ↓ again will display "d."
5. Pressing DISP will return to SP
6. "P" – Proportional Band
7. Percentage of set point at which the burner begins to modulate down from 100% firing rate.
8. The smaller the number, the longer the unit will remain at 100% firing rate.
9. With Proportional only setting, the boiler typically will never reach set point.
10. "I" – Integral Band
11. How often the unit checks to adjust the firing rate.
12. The smaller the number, the faster the controller reacts. If it reacts too fast, it will oscillate.
13. Integral setting allows the boiler to reach the set point
14. Fulton standard Integral time setting is "minutes/ seconds per repeat"
15. "D" – Derivative Band
16. Proportional does the heavy lifting getting the temperature close to the set point and Integral
gradually removes error. Most systems you will not need it.
17. D is used to compensate for dead (or lag) time.
18. The D term adds to, or subtracts from, the output an amount defined by the mathematical
derivative or rate of change of the operating value.
19. PID Settings for a typical boiler system with the boiler correctly sized is P=20 / I=45 / D=0 To
change the controllers from Automatic Mode to Manual Mode
1. Press the "A/M" button until the red light illuminates next to MAN and OUt is displayed.
2. Use the ↑ /↓ to change the output from 0.0 to100.0.
3. To return to Automatic Mode, press the "A/M" key again and the red light will turn off.
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