Mitsubishi Electric FR-F740 EC Instruction Manual page 479

Parameter
Pr. No. Name
PID control
automatic
127
switchover
frequency
PID action
128
selection
PID proportional
129
band
130
PID integral time
131
PID upper limit
FR-F700 EC
Initial Setting
Description
Value Range
Set the frequency at which the control is
0–400Hz
automatically changed to PID control.
9999
Without PID automatic switchover
9999
function
PID reverse
10 , 110
action
PID forward
11 , 111
action
PID reverse
20 , 120
action
PID forward
21 , 121
action
PID reverse
40 , 140
action
PID forward
41 , 141
action
PID reverse
50
action
PID forward
51
action
PID reverse
60
action
10
PID forward
61
action
PID reverse
70
action
PID forward
71
action
PID reverse
80
action
PID forward
81
action
PID reverse
90
action
PID forward
91
action
PID reverse
100
action
PID forward
101
action
If the proportional band is narrow
(parameter setting is small), the manip-
ulated variable varies greatly with a
slight change of the measured value.
0.1–1000% Hence, as the proportional band nar-
100%
rows, the response sensitivity (gain)
improves but the stability deteriorates,
e.g. hunting occurs.
Gain Kp = 1/proportional band
9999 No proportional control
For deviation step input, time (Ti)
required for only the integral (I) action to
provide the same manipulated variable
0.1–3600s as that for the 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/
0–100%
9999
5V/10V) of the measured value
(terminal 4) is equivalent to 100%.
9999 No function
Parameters referred to
Deviation value signal
(terminal 1)
Measured value
C2 (Pr. 902)
(terminal 4 )
Set point (terminal 2
C7 (Pr. 905)
or Pr. 133)
Measured value
(terminal 4)
Set point input
(LONWORKS, CC-Link
communication,
BACnet)
Deviation value signal
input (LONWORKS,
CC-Link communica-
tion, BACnet)
Measured value, set
point input
(LONWORKS, CC-Link
communication,
BACnet)
Deviation value signal
input:
PLC function
Measured value,
set point input:
PLC function
Deviation value signal
input:
PLC function
(Not applied to the inver-
ter frequency)
Measured value,
set point input:
PLC function
(Not applied to the inver-
ter frequency)
PID control
Refer to
Section
59 Remote function
6.5.4
selection
73 Analog input
6.15.1
selection
79 Operation mode 6.17.1
selection
178–189 Input terminal 6.9.1
function selection
190–196 Output terminal 6.9.5
function selection
Frequency
6.15.4
– setting voltage
(current) bias/
gain
6 - 329