Mitsubishi Electric FR-A701 Instrucion Manual page 123

Parameter List
Parameter
PID control
automatic
127
switchover
frequency
128
PID action selection
PID proportional
129
band
130
PID integral time
131
PID upper limit
132
PID lower limit
133
PID action set point
134
PID differential time
Output interruption
575
detection time
Output interruption
576
detection level
Output interruption
577
cancel level
116
Incre Initial
Name
ments Value
0.01Hz 9999
1 10
0.1% 100%
0.1s 1s
0.1% 9999
0.1% 9999
0.01% 9999
0.01s 9999
0.1s 1s
0.01Hz 0Hz
0.1% 1000% 900 to 1100%
Range Description
Set the frequency at which the control is
0 to 400Hz
automatically changed to PID control.
9999 Without PID automatic switchover function
10 PID reverse action
11 PID forward action
20 PID reverse action
21 PID forward action
50 PID reverse action
51 PID forward action
60 PID reverse action
61 PID forward action
If the proportional band is narrow
(parameter setting is small), the
manipulated variable varies greatly with a
slight change of the measured value.
0.1 to 1000% Hence, as the proportional band narrows,
the response sensitivity (gain) improves
but the stability deteriorates, e.g. hunting
occurs.
Gain K = 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 as that for the
0.1 to 3600s
proportional (P) action. 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,
0 to 100% the FUP signal is output. The maximum
input (20mA/5V/10V) of the measured
value (terminal 4) is equivalent to 100%.
9999 No function
Set the lower limit value.
If the measured value falls below the
setting range, the FDN signal is output.
0 to 100%
The maximum input (20mA/5V/10V) of the
measured value (terminal 4) is equivalent
to 100%.
9999 No function
0 to 100% Used to set the set point for PID control.
9999 Terminal 2 input voltage is the set point.
For deviation lamp input, time (Td)
required for providing only the manipulated
0.01 to
variable for the proportional (P) action. As
10.00s
the differential time increases, greater
response is made to a deviation change.
9999 No differential control.
If the output frequency after PID operation
remains lower than the Pr. 576 setting for
0 to 3600s
longer than the time set in Pr. 575, the
inverter stops operation.
9999 Without output interruption function
Set the frequency at which the output
0 to 400Hz
interruption processing is performed.
Set the level (Pr. 577 -1000%) to release the
PID output interruption function.
Para Param
meter eter
copy clear
: enabled
× : disabled
Deviation value
signal (terminal 1)
Measured value
input (terminal 4)
Set value (terminal
2 or Pr. 133)
Deviation value
signal input
(L W , CC-Link
ON ORKS
communication)
Measured value,
set value input
(L W , CC-Link
ON ORKS
communication)
All
param
eter
clear