Pid Control - Mitsubishi Electric FR-F700 Manual

F700 series
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Pr.
Pr.
Pr.
125
126
Analog input frequency change and voltage, current input and
frequency adjustment (calibration)
Pr.125 Terminal 2 frequency setting gain frequency
Pr.126 Terminal 4 frequency setting gain frequency
Pr. 241 Analog input display unit switchover
C2(Pr.902) Terminal 2 frequency setting bias frequency
C3(Pr.902) Terminal 2 frequency setting bias C4(Pr.903) Terminal 2 frequency setting gain
C5(Pr.904) Terminal 4 frequency setting bias frequency
C6(Pr.904) Terminal 4 frequency setting bias C7(Pr.905) Terminal 4 frequency setting gain
You can set the magnitude (slope) of the output frequency as
desired in relation to the frequency setting signal (0 to 5VDC, 0 to
10V or 4 to 20mA).
(1)
Change the frequency at maximum analog input.
(Pr.125, Pr.126)
Set a value in Pr. 125 (Pr. 126) when changing only the
frequency setting (gain) of the maximum analog input power
(current). (C2 (Pr. 902) to C7 (Pr. 905) setting need not be
changed)
60Hz
Bias
C2
(Pr.902)
0
0
Frequency setting signal
0
C3
(Pr.902)
60Hz
Bias
C5
(Pr.904)
0
20
0
4
Frequency setting signal
C6 (Pr.904)
(2) Analog input bias/gain calibration
(C2(Pr.902) to C7(Pr.905))
⋅ The "bias" and "gain" functions are used to adjust the
relationship between the input signal entered from outside
the inverter to set the output frequency, e.g. 0 to 5V, 0 to 10V
or 4 to 20mADC, and the output frequency.
⋅ Set the bias frequency of terminal 2 input using C2(Pr. 902).
(Factory-set to the frequency at 0V)
⋅ Using Pr. 125 , set the output frequency relative to the
frequency command voltage (current) set in Pr. 73 Analog
input selection.
⋅ Set the bias frequency of the terminal 4 input using C5(Pr.
904).
(Factory-set to the frequency at 4mA)
⋅ Using Pr. 126 , set the output frequency relative to 20mA of
the frequency command current (4 to 20mA).
(3) Analog input display unit changing (Pr. 241)
⋅ You can change the analog input display unit (%/V/mA) for
analog input bias/gain calibration.
39
indicates simple mode parameters and
Pr.
241, C2(902) to C7(905)
Initial value
Gain
Pr.125
100%
5V
10V
C4
(Pr.903)
Initial value
Gain
Pr.126
100%
20mA
C7
(Pr.905)
indicates extended parameters. When setting parameters, refer to the instruction manual (applied) and understand instructions.
Pr.
Pr.
127 to 134, 575 to 577
Pr.127 PID control automatic switchover freqeuncy
Pr.128 PID action selection
Pr.130 PID integral time
Pr.132 PID lower limit
Pr.134 PID differential time
Pr.576 Output interruption detection level Pr.577 Output interruption release level
The inverter can be used to exercise process control, e.g. flow
rate, air volume or pressure.
The terminal 2 input signal or parameter setting is used as a set point
and the terminal 4 input signal used as a feedback value to constitute
a feedback system for PID control.
⋅ Pr.128 ="10, 11" (Deviation value signal input)
Deviation signal
Set point
+ -
Terminal 1
0 to
10VDC
(0 to
5V)
To outside
Feedback signal (measured value)
Kp: Proportionality constant Ti: Integral time S: Operator Td: Differential time
⋅ Pr.128 ="20, 21" (Measured value input)
Inverter circuit
Pr. 133 or
terminal 2
+ -
Set point
Kp 1+
0 to 5VDC
(0 to 10V, 4 to 20mA)
Terminal 4
Feedback signal (measured value)
Kp: Proportionality constant Ti: Integral time S: Operator Td: Differential time
Switch between the inverter operation and
Pr.
135 to 139, 159
commercial power-supply operation to use
Pr.135 Commercial power-supply switchover sequence output terminal selection
Pr.136 MC switchover interlock time
Pr.138 Commercial power-supply operation switchover selection at an alarm
Pr.139 Automatic switchover frequency between inverter and commercial power-supply operation
Pr.159 Automatic switchover ON range between commercial power-supply and inverter operation
The complicated sequence circuit for commercial power supply-
inverter switchover is built in the inverter. Hence, merely
inputting the start, stop or automatic switchover selection signal
facilitates the interlock operation of the switchover magnetic
contactor.
Pr135 Setting
0 (initial value)
Without commercial power-supply switchover sequence
1
With commercial power-supply switchover sequence
Sink logic type, Pr.185 = "7", Pr.192 = "17", Pr.193 = "18", Pr.194 = "19"
MCCB
MC1
R/L1
S/L2
T/L3
R1/L11
S1/L21
Inverter start
(forward rotation)
Inverter/commercial
STF
power-supply switchover
CS
MRS
Operation interlock
*3
External
JOG(OH)
thermal reset
RES
SD
10
Frequency
2
setting signal
5
Commercial power-supply switchover sequence connection diagram
*1
Take caution for the capacity of the sequence output terminal.
*2
When connecting a DC power supply, insert a protective diode.
*3
The used terminal changes depending on the setting of Pr. 180 to Pr. 189
(input terminal function selection).
Refer to the section about Pr. 29 and
Pr.
140 to 143
other relevant parameters.
Refer to the section about Pr. 37 and other
Pr.
144
relevant parameters.

PID control

Pr.129 PID proportional band
Pr.131 PID upper limit
Pr.133 PID action set point
Pr.575 Output interruption detection time
Inverter circuit
Motor
Manipulated
PID operation
variable
IM
1
Kp
1+
+Td S
Ti S
Motor
Manipulated
PID operation
variable
IM
1
+Td
S
Ti
S
4 to 20mADC (0 to 5V, 0 to 10V)
Pr.137 Waiting time at a start
Description
MC2
External
thermal relay
MC3
U
V
IM
W
*1
MC
(MC1)IPF
1
MC3
*1
MC
(MC2)OL
*2
2
24VDC
MC2
*1
MC
(MC3)FU
3
SE

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