Precision-digital PD554 User Manual download pdf (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 limit 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.

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.

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.

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%.

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

Fig 8: Overshoot Suppression with Fuzzy Logic

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

STSTST

STST

This parameter establishes 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.

C.mod

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Precision-digital PD554 User Manual Page 33