Mitsubishi Electric FR-E700 Instruction Manual page 448

Special operation
Initial
Pr. No. Name
Value
PID control
automatic
127
9999
switchover
frequency
PID action
128
0
selection
PID proportional
129
100%
band
PID integral time
130
1s
131
PID upper limit 9999
132
PID lower limit 9999
PID action set
133
9999
point
PID differential
134
9999
time
The above parameters can be set when Pr. 160 "User group read selection" = 0.
This parameter allows its setting to be changed during operation in any operation mode even if
"0" (initial value) is set in Pr. 77 "Parameter write selection".
6 - 294
Setting
Description
Range
Set the frequency at which the control is automatically changed to PID
0–400 Hz
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 ORKS
PID forward
51
action
PID reverse
60
action
Measured value, set point input
(L W
ON ORKS
PID forward
61
action
If the proportional band is narrow (parameter setting is small), the
0.1 manipulated variable varies greatly with a slight change of the
– measured value. Hence, as the proportional band narrows, the
1000% 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)
0.1
action to provide the same manipulated variable as that for the
–
proportional (P) action. As the integral time decreases, the set point is
3600 s
reached earlier but hunting occurs more easily.
9999 No integral control.
Maximum value
If the feedback value exceeds the setting, the FUP signal is output. The
0–100%
maximum input (20 mA/5 V/10 V) 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 FDN signal is
0–100%
output. The maximum input (20 mA/5 V/10 V) 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.
0.01 For deviation ramp input, time (Td) required for providing only the
– manipulated variable for the proportional (P) action. As the differential
10.00 s time increases, greater response is made to a deviation change.
9999 No differential control.
For dancer control set point
(Pr. 133), measured value
(terminal 4) main speed
(frequency command of the
operation mode)
, CC-Link communication)
, CC-Link communication)
Parameter
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