Omron EJ1 User Manual page 86

Setting Control Specifications
Note
• Derivative action:
• Effect of Changes to P (Proportional Band)
Increased P
Decreased P
• Effect of Changes to I (Integral Time)
Increased I
Decreased I
• Effect of Changes to D (Derivative Time)
Increased D
Decreased D
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.
Variable type
Proportional Band × 10
F0/B0
Compensation
Conditions for use The control method must be set to 2-PID control.
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.
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.
The curve rises gradually and the
settling time is long, but overshooting
is prevented.
Overshooting and hunting occur, but
the set value is reached quickly and
the temperature stabilizes.
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.
Overshooting and undershooting
occur. Hunting occurs. The process
value rises quickly.
Overshooting, undershooting, and
the settling time are reduced, but fine
hunting occurs on the changes them-
selves.
Overshooting and undershooting are
increased and it takes time for the
process value to reach the set point.
Parameter name
(Common)
Section 4-3
Setting range Default
0: Disabled 0
1: Enabled
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