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Mitsubishi Electric FR-F740-00023 Instruction Manual: Special Operation And Frequency Control

F700 series.
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4.20 Special operation and frequency control

Purpose
Perform process control such as pump and air
volume.
Pump function by multiple motors
Traverse function
Switch between the inverter operation and
bypass operation to operate.
Avoid overvoltage alarm due to regeneration by
automatic adjustment of output frequency
4.20.1 PID control (Pr. 127 to Pr. 134, Pr. 241, Pr. 553, Pr. 554, Pr. 575 to Pr. 577,
C42 (Pr. 934) to C45 (Pr. 935))
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.
Parameter
Name
Number
PID control automatic
127
switchover frequency
128
PID action selection
129
PID proportional band
*1
130
PID integral time
*1
131
PID upper limit
132
PID lower limit
133
PID action set point
*1
Parameter that must be Set
PID control
Advanced PID function
Traverse function
Bypass-inverter switchover
function
Regeneration avoidance
function
Initial
Setting
Value
Range
Set the frequency at which the control is automatically
0 to 400Hz
changed to PID control.
9999
9999
Without PID automatic switchover function
10, 110
PID reverse action
*2
11, 111
PID forward action
*2
20, 120
PID reverse action
*2
21, 121
PID forward action
*2
10
50
PID reverse action
*2
51
PID forward action
*2
60
PID reverse action
*2
61
PID forward action
*2
If the proportional band is narrow (parameter setting is small),
the manipulated variable varies greatly with a slight change of
the measured value. Hence, as the proportional band narrows,
0.1 to 1000%
the response sensitivity (gain) improves but the stability
100%
deteriorates, e.g. hunting occurs.
Gain Kp = 1/proportional band
9999
No proportional control
When deviation step is input, time (Ti) is the time required for
integral (I) action to provide the same manipulated variable as
0.1 to 3600s
proportional (P) action.
1s
As the integral time decreases, the set point is reached earlier
but hunting occurs more easily.
9999
No integral control.
Set the upper limit value. If the feedback value exceeds the
setting, the FUP signal is output. The maximum input (20mA/
0 to 100%
*3
5V/10V) of the measured value (terminal 4) is equivalent to
9999
100%.
9999
No function
Set the lower limit value. If the measured value falls below the
setting range, the FDN signal is output. The maximum input
0 to 100%
*3
(20mA/5V/10V) of the measured value (terminal 4) is
9999
equivalent to 100%.
9999
No function
0 to 100%
Used to set the set point for PID control.
*3
9999
9999
Terminal 2 input is the set point.
Special operation and frequency control
Pr. 127 to Pr. 134, Pr. 241, Pr.
553, Pr. 554, Pr. 575 to Pr. 577,
C42 (Pr. 934) to C45 (Pr. 935)
Pr. 554, Pr. 575 to Pr. 591
Pr. 592 to Pr. 597
Pr. 135 to Pr. 139, Pr. 159
Pr. 882 to Pr. 886
Description
Deviation value signal input
(terminal 1
Measured value (terminal 4
Set point (terminal 2
Deviation value signal input
(L
W
, CC-Link communication)
ON
ORKS
Measured value, set point input
(L
W
, CC-Link communication)
ON
ORKS
Refer
to Page
219
236
246
231
248
)
*4
)
*5
or Pr. 133)
*4
4
219

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