PXR3 Instruction Manual - Coulton Instrumentation

2Setting ofthe algorithm* Read if the controldoesn't work as youexpect.qSelect the type of control output action.HeatingCoolingControloutput actionDescriptionReverse As PV increases,MV decreases.As PV decreases,MV increases.Direct As PV increases,MV also increases.As PV decreases,MV also decreases.Setting procedureSet parameter“P-n1” = 0 or 1.(Refer to Table 2)Set parameter“P-n1” = 2 or 3.(Refer to Table 2)wControl algorithm (ON/OFF, PID or fuzzy)Type ofcontrolON/OFFcontrolPID controlFuzzycontrolPID controlwithself-tuning.DescriptionOutput is either ON (100%) orOFF (0%).(Suitable when frequent outputswitching is inconvenient.)The output signal changeswithin the range at 0 to 100%according to PID calculationwhich determine the proportionalof ON to OFF in each TC(cycle time).Fuzzy operation is added to PIDprovidingcontrol with less overshoot.At power on, changing a set valueor the external disturbance, tuningis made automatically so that thePID parameters are re-optimized.It is useful where modification of PIDparameters is required repeatablydue to frequent change in processcondition.Setting procedureSet “P” =0.0.Refer to “6-1 ON/OFF control”Select PID at “CTrL”.Execute auto-tuning so that optimumP.I.D can be calculated automatically.(PID parameters can be setspontaneously).*Refer to “6-2 Auto-tuning”.Select FUZy at “CTrL”.Then execute the auto-tuning so thatFUZZY control starts.Select SELF at “CTrL”.Refer to “6-3 Self-tuning”.– 29 –