Honeywell UDC 3300 manual PID a PID B, Pd+Mr

Lower Display

Prompt

CONT ALG

Upper Display

Range of Setting

or Selection

PID A

ATTENTION PID A should not be used for Proportional only action; i.e., no integral (reset) action. Instead, use PD+MR with rate set to 0.

PID B

Parameter

Definition

PID A is normally used for three-mode control. This means that the output can be adjusted somewhere between 100

%and 0 %. It applies all three control actions— Proportional (P), Integral (I), and Derivative (D)— to the error signal.

Proportional (Gain)— Regulates the controller’s output in proportion to the error signal (the difference between Process Variable and Setpoint).

Integral (Reset)— Regulates the controller’s output to the size of the error and the time the error has existed. (The amount of corrective action depends on the value of proportional Gain.)

Derivative (Rate)— Regulates the controller’s output in proportion to the rate of change of the error. (The amount of corrective action depends on the value of proportional Gain.)

PID B— Unlike the PID A equation, the controller gives only an integral response to a setpoint change, with no effect on the output due to the gain or rate action, and it gives full response to PV changes. Otherwise controller action is as described for the PID A equation. See note on PID A.

PD+MR	PD WITH MANUAL RESET is used whenever integral
	action is not wanted for automatic control. The equation is
	computed with no integral contribution. The MANUAL
	RESET, which is operator adjustable, is then added to the
	present output to form the controller output.
	Switching between manual and automatic mode will be
	bumpless.
	If you select PD with Manual Reset you can also configure
	the following variations:
	• PD (Two Mode) control,
	• P (Single Mode) control.
	Set Rate (D) to 0.
	Other prompts affected: MAN RSET in the Tuning Set Up
	group

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