Hi I am using a PID to control Air and gas in a combustion setting. When the temp reaches 30 degrees above my setpoint I set the air loop to 70% (operator suggested air setting)as opposed to the ratio from gas Setpoint. When the temp reaches within 10 degrees I set the Air setpoint back to what the gas ratio demands. I am noticing that the temperature is now swinging more than usual above and below Temp Setpoint.
Does my setpoint "jumping" effect the response of the PID air loop after I set it back to ratio SP? The jumps typically are around 10% air to 60% air and back as overtemp occurs.
Setup: Siemens 343(i think) controller. 2 loops. Loop1 temp sp= SP, temp feedback= PV, gas valve=CV. Loop2 sp is either ratio from gas or fixed sp for cooling, PV = air feedback, CV=air valve.
Does my setpoint "jumping" effect the response of the PID air loop after I set it back to ratio SP? The jumps typically are around 10% air to 60% air and back as overtemp occurs.
Setup: Siemens 343(i think) controller. 2 loops. Loop1 temp sp= SP, temp feedback= PV, gas valve=CV. Loop2 sp is either ratio from gas or fixed sp for cooling, PV = air feedback, CV=air valve.