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Pid Control - Mitsubishi Electric FR-F820-00046 Instruction Manual

Fr-f800 series.
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NOTE
• When a trigger occurs during the following operations, the cleaning operation is started upon completion of the following
operations.
Automatic restart after instantaneous power failure, online auto tuning at startup
• The following functions are disabled during cleaning operation.
PID control automatic switchover frequency, PID control sleep function, pre-charge fault, determination of pre-charge ending
with parameters, PID gain tuning, switchover to the commercial power supply operation with the automatic switchover
frequency of the inverter (Pr.139), automatic switchover of auxiliary motors of the multi-pump function, output stop function
(Pr.522), restart at every start during cleaning
• When the stall prevention is activated during acceleration of the cleaning function, the operation is shifted to the cleaning
deceleration operation.
• If the number of cleaning times set in Pr.1470 is an even number, the operation is shifted to the normal operation after the
cleaning forward/reverse operation time (Pr.1473/Pr.1475) of the final cleaning operation has elapsed.
• Changing the terminal assignment with Pr.178 to Pr.189 and Pr.190 to Pr.196 may affect other functions. Set parameters
after confirming the function of each terminal.
Parameters referred to
Pr.178 to Pr.189 (Input terminal function
Pr.190 to Pr.196 (Output terminal function
Pr.7 Acceleration time, Pr.8 Deceleration

5.11.6 PID control

Process control such as flow rate, air volume or pressure are possible on the inverter.
A feedback system can be configured and PID control can be performed using the terminal 2 input signal or parameter setting
value as the set point and the terminal 4 input signal as the feedback value.
Pr.
Name
127
PID control automatic
A612
switchover frequency
128
PID action selection
A610
129
PID proportional band
A613
130
PID integral time
A614
131
PID upper limit
A601
132
PID lower limit
A602
133
PID action set point
A611
selection)page 355
selection)page 312
timepage 216
Initial value
Setting range
0 to 590 Hz
9999
9999
0, 10, 11, 20, 21,
50, 51, 60, 61, 70,
71, 80, 81, 90, 91,
0
100, 101, 1000,
1001, 1010,
1011, 2000,
2001, 2010, 2011
0.1 to 1000%
100%
9999
0.1 to 3600 s
1 s
9999
0 to 100%
9999
9999
0 to 100%
9999
9999
0 to 100%
9999
9999
Description
Set the value at which control is automatically switched to PID
control.
No PID control automatic switchover function
Select how to input the deviation value, measured value and set
point, and forward and reverse action.
If a narrow proportional band is set (small parameter setting value),
the manipulated amount changes considerably by slight changes in
the measured value. As a result, response improves as the
proportional band becomes narrower, though stability worsens as
shown by the occurrence of hunting. Gain Kp=1/proportional band
No proportional control
With deviation step input, this is the time (Ti) used for obtaining the
same manipulated amount as proportional band (P) by only integral
(I) action. Arrival to the set point becomes quicker the shorter an
integral time is set, though hunting is more likely to occur.
No integral control
Set the upper limit. The FUP signal is output when the feedback
value exceeds this setting. The maximum input (20 mA/5 V/10 V) of
the measured value is equivalent to 100%.
No function
Set the lower limit. The FDN signal is output when the measured
value falls below the setting range. The maximum input (20 mA/5 V/
10 V) of the measured value is equivalent to 100%.
No function
Set the set point during PID control.
Set point set by Pr.128.
5. PARAMETERS
5.11 (A) Application parameters
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