4-3-10 Operation During Errors - Omron EJ1 User Manual

Setting Control Specifications
Note
Starting Conditions
for the Disturbance
Overshoot
Adjustment Function

4-3-10 Operation during Errors

Note
Temperature
SP
0
The waveform shown in the diagram above will vary depending on the control
object's characteristics and the PID constant settings.
The Disturbance Overshoot Adjustment Function will operate after the pro-
cess value (PV) has stabilized in the Disturbance Rectification Band and the
deviation is larger than the Disturbance Judgment Width.
• When the Disturbance Judgment Width is positive, the Disturbance Over-
shoot Adjustment Function will operate if a disturbance causes the pro-
cess value (PV) to fall. When the Disturbance Judgement Width is
negative, the Disturbance Overshoot Adjustment Function will operate if a
disturbance causes the process value (PV) to rise.
• The Disturbance Overshoot Adjustment Function will not operate in the
following situations:
• When the Disturbance Rectification Band or Disturbance Judgment
Width parameter is 0
• When the set point is changed (when the set point change width ex-
ceeds the Disturbance Rectification Band)
• During autotuning
• During ON/OFF control
• During PD control (I = 0.0)
Temperature
The Disturbance Overshoot Adjustment Function does not operate.
SP
This parameter can be used to select the operation when an error occurred.
Variable type
F0/B0
Operation During Error (Selection B)
Conditions for use There must be a CT input.
This parameter can be set only when operation is stopped.
When this parameter has been changed, the new setting becomes effective
Disturbance Time Constant = 1
Disturbance Time Constant = 2
Time
The Disturbance Overshoot Adjustment Function operate.
Time
Parameter name
(Common)
Section 4-3
Disturbance Rectification
Band
Disturbance Judgment
Width
Setting range Default
0
0: Notification only
(continue)
1: MV at PV Error
2: Stop control
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