Honeywell DR4300 manual Proportional-Integral-Derivative, PROPORTIONAL-DERIVATIVE with Manual

DR4300 Circular Chart Recorder

Lower Display		Upper Display	Parameter
Prompt	Range of Setting		Definition
		or Selection
CTRALG	PID A		PROPORTIONAL-INTEGRAL-DERIVATIVE—
(continued)	NOTE: PID A should not be		PID A is normally used for three-mode control. Unlike
			ON/OFF control, with PID A the output can be
	used for proportional only		somewhere between 100 % and 0 %. PID A applies all
	action (that is, no integral		three control actions (Proportional, Integral, and
	(reset) action). Instead, use		Derivative) to the error. This control can be tuned using
	PDMR with “RATE T” set to
			the parameters in the tuning group.
	0.
			• Proportional (gain) regulates the controller’s output in
			proportion to the size of the error (difference between
			setpoint and process variable).
			• Integral (reset) regulates the controller’s output in
			proportion to the size of the error and time the error
			has existed (duration). The amount of corrective action
			depends on the value of the proportional gain.
			• Derivative (rate) regulates the controller’s output in
			proportion to the rate of change of the error. Again, the
			amount of correction depends on the gain setting.
	PDMR		PROPORTIONAL-DERIVATIVE with MANUAL
			RESET—Use PDMR whenever integral action is not
			needed during automatic control. The output is calculated
			with no integral contribution. Then the value specified
			using the tuning parameter “MANRST” (manual reset) is
			added to the computed output to determine the controller
			output.
			Switching between manual and auto modes will not be
			bumpless in PDMR.
			PDMR variations: If you select PDMR you can configure
			the following variations:
			• PD (proportional-derivative) control, by setting
			MANRST to 0.
			• P (proportional only) control, by setting MANRST
			(integral term) to 0 and rate (derivative term) to 0
			(tuning parameter “RATE T”).
PWR UP			POWER UP CONTROLLER MODE RECALL—This
			selection determines which mode the recorder will use
			when it restarts after a power loss.
	MAN	[factory setting]	MANUAL—At power-up, the recorder will use manual
			mode with the output value displayed.
	AUTO		AUTOMATIC—At power-up, the recorder will return to the
			automatic mode.
DEFDSP	INP	[factory setting]	DEFAULT DISPLAY—This selection determines the
	SP		default display (input or active setpoint) on power up.

96 DR4300 Circular Chart Recorder Product Manual 12/03