Honeywell DR4500A Product Manual page 111

Lower Display
Prompt Range of Setting or Selection
CONT1ALG
PID A
(continued)
NOTE: PID A should not be
used for Proportional only action
(that is, no integral (reset)
action.) Instead, use PD+MR
with rate set to 0.
PID B
PD+MR
Release M DR4500A Classic Series Circular Chart Recorder With or Without Control Product Manual
April 2017
Upper Display
Configuration Parameter Definitions
Control Parameters Set Up Group
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 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 not
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) and/or Reset Time (I) to 0.

Other prompts affected: "MAN RSET"
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