Precision Digital PD540 - Manual (Page 27)

5.5 PID Group (G.PID)
The parameter sets the PV deviation width to prevent overshoot. When the control outputs
reach this high l imit value, they stop ordinary output action for integral control and use
ARW (Anti-Reset Windup). When the setting is AUTO, this parameter is calculated
automatically.
PV
PV
This parameter activates the use of fuzzy logic. Fuzzy logic can be effective in
suppressing overshoot and reducing PV variation that may occur once the PV has reached
the SP. Refer to Fig 5: Overshoot Suppression with Fuzzy Logic.
PV
This parameter establishes the number of PID setting groups to be used in control output
calculation. Up to 4 user defined groups of proportional, integral, and derivative value
zones can be established. Use this setting to enter the setting menus for each PID group.
PV
This parameter sets the proportional operation for PID control.
Setting range of 1.P is 0.1 (H/C model: 0.0) to 999.9%.
Its default setting is 10.0%.
PV
Fig 5: Overshoot Suppression with Fuzzy Logic
SP
PV: Fuzzy Logic Off
PV: Fuzzy Logic On
The PID group selection does not appear when the controller is operating in On/Off mode
Press SET/ENT key to select PID group. (Refer to parameter map in section 3.)
?
NOTE
G.AT G.SP G.PID PWD G.CTL G.IN
G.COM G.RET G.ALM G.OUT
This parameter establish es the control mode. It can be set to Differential of Deviation Value
(d. dv) or Process Variable (d. pv). Dviation Value mode will reduce overshoot. Process
Variable mode will more quickly raise and lower the PV. The default setting is d. dv.
PV C.mod
PD540 Series Nova Digital Process and Temperature Controller Instruction Manual
27