Control method – Nor-Cal SDC15 Controller User Manual
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5-11
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Control method
A desired control method can be selected from three kinds of control methods.
• When the control output type is relay (R0), the initial value becomes "0". The
initial value is "1" in other cases.
• "Fixed" of [1: Fixed PID] means that the PID constant is not changed
automatically since the ST is not run. However, the AT can be run even in the
fixed PID control.
• When using the Heat/Cool control (C26=1) or when using the Just-FiTTER
control (JF.ov > 0), the ST is not run even though [2: ST] is set.
• The following Table shows valid and invalid functions related to [1: Fixed PID]
and [2: ST], as well as other related parameters:
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION
Item (Setting display/bank)
Display
Contents
Initial value
User level
Control method
(Parameter
setting/Parameter bank)
0: ON/OFF control
1: Fixed PID
2: ST (Self-tuning)
0 or 1
Simple,
Standard,
High function
Classification of
Classification
Classification of
RationaLOOP
AT
ST
Just-FiTTER
Heat/Cool control of RationaLOOP control action
function
Normal control
Normal PID
P control
X
❍ ✽
X
X
PI control
X
❍ ✽
X
❍
PD control
X
❍ ✽
X
X
PID control
X
❍
❍
❍
RationaLOOP P control
X
❍ ✽
X
X
PI control
X
❍ ✽
X
❍
PD control
X
❍ ✽
X
X
PID control
❍
❍
❍
❍
Heat/Cool control Normal PID
P control
X
❍ ✽
X
X
PI control
X
❍ ✽
X
❍
PD control
X
❍ ✽
X
X
PID control
X
❍
X
❍
RationaLOOP P control
X
❍ ✽
X
X
PI control
X
❍ ✽
X
❍
PD control
X
❍ ✽
X
X
PID control
❍
❍
X
❍
Remarks
✽
Adjustment result be-
comes the PID control.
Related settings
Control algorithm
AT type
ST step execution Just-FiTTER overshoot limit/
resolution width
restraint/control coefficient
MV low limit at AT
ST step settling
Just-FiTTER
width
settling band
MV high limit at AT
ST hunching
settling width
AT Proportional
ST step ramp
band adjust
change
AT Integral time
adjust
AT Derivative time
adjust