Mitsubishi Electric FR-E700 Instruction Manual page 411

Parameter
Initial
Pr. No. Name
Value
PID control
automatic
127
9999
switchover
frequency
PID action
128
0
selection
PID propor-
129
100 %
tional band
PID integral
130
1 s
time
131
PID upper limit 9999
132
PID lower limit 9999
PID action set
133
9999
point
PID differen-
134
9999
tial time
The above parameters can be set when Pr. 160 "User group read selection" = 0.
Pr. 129, Pr. 130, Pr. 133 and Pr. 134 can be set during operation. They can also be set
independently of the operation mode.
FR-E700 EC
Setting
Description
Range
Set the frequency at which the control is automatically
0–400Hz
changed to PID control.
9999 Without PID automatic switchover function
0 PID action is not performed
PID reverse
20
action
Measured value (terminal 4)
Set value (terminal 2 or Pr. 133)
PID forward
21
action
PID reverse
40
action
Addition
method: fixed
PID forward
41
action
PID reverse
42
action
Addition
method: ratio
PID forward
43
action
PID reverse
50
action
Deviation value signal input
(L W
ON
PID forward
51
action
PID reverse
60
action
Measured value, set point input
(L W
ON
PID forward
61
action
If the proportional band is narrow (parameter setting is
small), the manipulated variable varies greatly with a
0.1
slight change of the measured value. Hence, as the
–
proportional band narrows, the response sensitivity
1000%
(gain) improves but the stability deteriorates, e.g. hunt-
ing occurs. Gain Kp= 1/proportional band
9999 No proportional control
For deviation step input, time (Ti) required for only the
0,1 integral (I) action to provide the same manipulated var-
– iable as that for the proportional (P) action. As the inte-
3600s gral time decreases, the set point is reached earlier but
hunting occurs more easily.
9999 No integral control.
Maximum value
If the feedback value exceeds the setting, the FUP sig-
0–100%
nal is output. The maximum input (20mA/5V/10V) of
the measured value (terminal 4) is equivalent to 100%.
9999 No function
Minimum frequency
If the process value falls below the setting range, the
0–100% FDN signal is output. The maximum input (20mA/5V/
10V) of the measured value (terminal 4) is equivalent
to 100%.
9999 No function
0–100% Used to set the set point for PID control.
9999 Terminal 2 input is the set point.
For deviation ramp input, time (Td) required for provid-
0,01
ing only the manipulated variable for the proportional
–
(P) action. As the differential time increases, greater
10.00s
response is made to a deviation change.
9999 No differential control.
For dancer control set
point (Pr. 133), meas-
ured value (terminal 4)
main speed (frequency
command of the opera-
tion mode)
, CC-Link communication)
ORKS
, CC-Link communication)
ORKS
Special operation
Parameters referred to
59 Remote function
selection
73 Analog input
selection
79 Operation mode
selection
178–184 Input terminal
function selection
190–192 Output terminal
function selection
261 Power failure stop
selection
C2 (Pr. 902) Frequency
– setting voltage
C7 (Pr. 905) (current) bias/
gain
Refer to
Section
6.6.3
6.16.1
6.18.1
6.10.1
6.10.5
6.12.2
6.16.3
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