67
Setting Control Specifications
Section 4-3
• Derivative action:
This control action produces an output that is propor-
tional to the rate of change of the input. Since propor-
tional control and integral control correct for errors in
the control result, the control system will be slow to
respond to sudden changes in temperature. The
derivative action performs a corrective action by
increasing the MV in proportion to the slope of the
temperature change.
• Effect of Changes to P (Proportional Band)
• Effect of Changes to I (Integral Time)
• Effect of Changes to D (Derivative Time)
■
Proportional Band x 10 Compensation
When this parameter is set to
Enabled
, the proportional band is increased by
a factor of 10. Use this parameter when the proportional band setting range is
insufficient.
Note
When this parameter has been changed, the new setting becomes effective
the next time a software reset is performed for the Unit or the next time power
is turned ON.
Increased P
The curve rises gradually and the
settling time is long, but overshooting
is prevented.
Decreased P
Overshooting and hunting occur, but
the set value is reached quickly and
the temperature stabilizes.
Increased I
It takes a long time for the process
value to reach the set point. It takes
time to achieve a stable state, but
overshooting, undershooting, and
hunting are reduced.
Decreased I
Overshooting and undershooting
occur. Hunting occurs. The process
value rises quickly.
Increased D
Overshooting, undershooting, and
the settling time are reduced, but fine
hunting occurs on the changes them-
selves.
Decreased D
Overshooting and undershooting are
increased and it takes time for the
process value to reach the set point.
Set value
Set value
Set value
Set value
Set value
Set value
Variable type
Parameter name
Setting range
Default
F0/B0
Proportional Band
×
10
Compensation (Common)
0: Disabled
1: Enabled
0
Conditions for use
The control method must be set to 2-PID control.
Содержание EJ1 EtherCAT
Страница 2: ...EJ1 Modular Temperature Controllers User s Manual Revised July 2008 ...
Страница 3: ...iv ...
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Страница 213: ...188 Detailed Description of Services Section 6 4 ...
Страница 227: ...202 Detailed Description of Services Section 7 5 ...
Страница 251: ...226 Determining the Error from the Current Situation for Heater Burnout Alarm Errors Section 8 8 ...
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