172-65710M-04 (SC-F71 Parameters/Functions) 23 Dec 2021
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Power off the controller once and power on again.
Stop the control once (STOP) and start the control again (RUN).
Change the Set value (SV).
The AT lamp lights during Startup tuning (ST).
After completion of Startup tuning (ST), the AT lamp goes off.
When Startup tuning setting is “
on1
: Execute once”, the setting will go back to
“
oFF
: ST unused.”
8.5 Setting PID Values Manually
To perform PID control, PID parameters shown below need to be set up. These PID
parameters can be automatically set using Autotuning (AT) or Startup tuning (ST).
Manual adjustment is also available.
Proportional band (P)
Integral time (I)
Derivative time (D)
Refer to 8.3 Setting PID Values Automatically (Autotuning) for Autotuning (AT)
function. Also refer to 8.4 Setting PID Values Automatically (Startup tuning) for
Startup tuning (ST) function.
Description of function
Critical parameters of PID control such as Proportional action (Proportional band: P),
Integral action (Integral time: I), and Derivative action (Derivative time: D) are
explained below. Note that this explanation is based on the reverse action (heating
control). With the direct action (cooling control), the output increases as the
measured value increases.
Proportional action
In the ON/OFF control action, the
manipulated output is turned on and off
repeatedly, resulting in oscillatory
control.
To eliminate this oscillation, control is
performed by producing Manipulated
output value (MV) proportional to the
deviation between the Set value (SV)
and the Measured value (PV).
Technically a zone called “Proportional
band” is established around the Set
value (SV) and when the Measured
value (PV) enters the proportional
band, the Manipulated output value
(MV) is gradually reduced.
The Measured value (PV) stabilizes
within the Proportional band at the
equilibrium point, but in many cases
the stabilized temperature does not
match the Set value (SV).
Manipulated
output value (MV)
Temperature
Set value (SV)
Proportional
band
Gradually
decreases
Summary of Contents for SC-F71
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Page 293: ...172 65710M 04 SC F71 Parameters Functions 23 Dec 2021 292 Checking PID values ...
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