Manual Setup - Omron E5ZN Operation Manual

Determining PID Constants: Autotuning and Manual Setup
3-7-2

Manual Setup

When P (Proportional
Band) Is Changed
When I (Integral Time) Is
Changed
When D (Derivative
Time) Is Adjusted
To set PID parameters manually, use host communications or the E5ZN-SDL
Setting Display Unit and set values for the "proportional band" (P), "integrated
time" (I) and "derivative time" (D) parameters.
Note
1. When control characteristics are already known, the PID parameters can be set di-
rectly to adjust control. PID parameters are set in the "proportional band" (P), "in-
tegrated time" (I), and "derivative time" (D) parameters.
2. When PID constants I (integral time) and D (derivative time) are set to 0, control is
executed according to proportional operation. The default set point becomes the
center value of the proportional band.
When P is
increased
When P is
decreased
When I is
increased
When I is
decreased
When D is
increased
When D is
decreased
Section 3-7
The curve rises gradually, and
a long adjustment time is
required, but there is no over-
shooting.
Overshooting and hunting
occur, but the set point is
quickly reached after which
the curve stabilizes.
It takes a long time for the pro-
cess value to reach the set
point. It takes time to adjust,
bit there is little overshooting,
undershooting, and hunting.
Overshooting, undershooting,
and hunting occur, but the
curve rises quickly.
Overshooting, undershooting,
and adjustment time are
reduced, but fine hunting
occurs on changes in the
curve itself.
Overshooting and under-
shooting increase, and it
takes time for the process
value to return to the set point.
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