Mitsubishi Electric FR-F820-00077 Instruction Manual page 547

Parameters
Measured value ≤ set point (reverse action)
Example
Set point [%]
Manipulated
Limit cycle output
(Pr.1215-1000)
Limit cycle output
(Pr.1216-1000)
PID gain tuning start
Fig. 5-176:
Details of the two-position ON/OFF operation
PID control
operation
Reverse action
Forward action
Tab. 5-180: Details of the two-position ON/OFF operation
● The manipulated amount is output at the limit cycle output upper limit (Pr. 1215 – 1000). (When
measured value > set point, the manipulated amount is once output at the limit cycle lower limit
(Pr. 1216 – 1000), and then after set point > measured value is achieved, the manipulated amount
is output at the limit cycle output upper limit (Pr. 1215 – 1000).)
● The two-position ON/OFF operation is repeated three times. From the waveform data of the values
measured for output of the second and third two-position operation, the vibration amplitude (Xc)
and the vibration cycle (Tc) are measured.
FR-F800
Measured value [%]
amount [%]
upper limit
lower limit
During
PID
control
STF
PID
PGT
Timing diagram of the example
Initial output of the manipulated amount
When measured value ≤ set point
Manipulated amount
= Upper limit of the output (Pr.1215 –1000)
When measured value > set point
Manipulated amount
= Lower limit of the output (Pr.1216 – 1000)
When measured value ≤ set point
Manipulated amount
= Lower limit of the output (Pr.1216 – 1000)
When measured value > set point
Manipulated amount
= Upper limit of the output (Pr.1215 –1000)
Vibration
period Tc
(1) (2) (3)
2d (two-
position
output)
During PID gain tuning
Two-position ON/OFF operation
Using
measured value ≥ set point + hysteresis (Pr.1217)
Manipulated amount
= Lower limit of the output (Pr. 1216 – 1000)
Using
measured value ≤ set point - hysteresis (Pr.1217)
Manipulated amount
= Upper limit of the output (Pr.1215 – 1000)
Using
measured value ≥ set point + hysteresis (Pr.1217)
Manipulated amount
= Upper limit of the output (Pr.1215 – 1000)
Using
measured value ≤ set point - hysteresis (Pr.1217)
Manipulated amount
= Lower limit of the output (Pr.1216 – 1000)
(A) Application parameters
PID gain tuning end
Vibration Limit cycle
amplitude Xc hysteresis
(Pr. 1217)
Vibration Limit cycle
amplitude Xc hysteresis
(Pr. 1217)
Time
Two-position
ON/OFF operation
(1) First time
(2) Second time
(3) Third time
Time
During
PID
control
5 - 375
I003045E