Precision Digital PD554 - Manual (Page 33)

5.7 PID Group (G.PID)
Press SET/ENT Key to select PID Group after press ¡ã or ¡å Key in Menu display
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
The parameter to set the proportional operation for PID control.
Setting range of 1.P is 0.1 to 999.9%.
Its default setting is 10.0%.
PV
The parameter to set the integration time for PID control.
Setting ranges of 1.I are OFF or 1 to 6000 seconds.
Its default setting is 120 seconds
PV
Fig 8: Overshoot Suppression with Fuzzy Logic
SP
PV: Fuzzy Logic Off
PV: Fuzzy Logic On
G.AT Q G.PID Q PWD Q G.CTL Q G.IS Q G.DO
K R
G.COM
Q G.RET Q G.ALM Q G.OUT Q G.IN
ST ST
ST ST
ST ST ST
ST ST
ST T
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
PD550 Series Nova Programmable Process and Temperature Controller Instruction Manual
33