Mitsubishi Electric FR-F820-00046, Instruction Manual

Page: 547 / 940

Parameters (A) Application parameters
FR-F800 5 - 375
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.
Example Measured value
≤
set point (reverse action)
I003045E
Fig. 5-176: Timing diagram of the example
PID control
operation
Initial output of the manipulated amount Two-position ON/OFF operation
Reverse action
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)
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)
Forward action
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)
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)
Tab. 5-180: Details of the two-position ON/OFF operation
STF
PID
PGT
(1) (2) (3)
PID gain tuning end
During PID gain tuning
Time
2d (two-
position
output)
Manipulated
amount [%]
Measured value [%]
PID gain tuning start
Time
Limit cycle output
upper limit
(Pr.1215-1000)
Limit cycle output
lower limit
(Pr.1216-1000)
Set point [%]
Two-position
ON/OFF operation
(1) First time
(2) Second time
(3) Third time
During
PID
control
Vibration
amplitude Xc
Vibration
period Tc
Vibration
amplitude Xc Limit cycle
hysteresis
(Pr. 1217)
Limit cycle
hysteresis
(Pr. 1217)
During
PID
control