Mitsubishi Electric 800 Series Instruction Manual page 411

 PID monitor function
• This function displays the PID control set point, measured value and deviation on the operation panel, and can output these
from the terminals AM and CA.
• An integral value indicating a negative % can be displayed on the deviation monitor. 0% is displayed as 1000. (These
values cannot be output on the deviation monitor from terminal CA.)
• Set the following values to Pr.52 Operation panel main monitor selection, Pr.774 to Pr.776 (Operation panel monitor
selection), Pr.54 CA terminal function selection and Pr.158 AM terminal function selection for each monitor.
Parameter Monitor
settings description
52 PID set point
92 Second PID
set point
53 PID
measured
value
93 Second PID
measured
value
67 PID
measured
value 2
95 Second PID
measured
value 2
54 PID deviation
94 Second PID
deviation
91 PID
manipulated
variable
96 Second PID
manipulated
variable
*1 When Pr.934 and Pr.935 are set, the minimum increment changes from unit % to no unit, and the monitor range can be changed. (Refer to
421.)
*2 When the minus value display is set disabled using Pr.290, the terminal AM output becomes "0".
 Adjustment procedure
1.
Enable PID control
When Pr.128  "0", PID control is enabled.
Set the set point, measured value and deviation input methods at Pr.128, Pr.609 and Pr.610.
2.
Setting the parameter
Adjust the PID control parameters of Pr.127, Pr.129 to Pr.134, Pr.553, Pr.554, Pr.575 to Pr.577.
3.
PID gain tuning
Pr.129, Pr.130 and Pr.134 are adjusted automatically by PID gain tuning. (Refer to
4.
Terminal setting
Set the I/O terminals for PID control. (Pr.178 to Pr.189 (Input terminal function selection), Pr.190 to Pr.196
(Output terminal function selection))
5.
Turn the X14 signal ON
When the X14 signal is assigned to the input terminal, PID control is enabled by the X14 signal turning ON.
6.
Start
410
5. PARAMETERS
5.11 (A) Application parameters
Minimum
increment
Terminal CA
0.1% *1
0 to 100%
0.1%
*1
0 to 100%
0.1% *1
0 to 100%
0.1% Setting not
available
0.1% Setting not
available
Monitor range
Terminal AM Operation panel
-100% to 900% to 1100%
or
*1*2
100%
-100% to 100%
-100% to 900% to 1100%
*2 or
100%
-100% to 100%
Remarks
"0" is displayed at all times when
PID control is based in deviation
input.
Displays PID measured value
even if the PID control operating
conditions are not satisfied while
the PID control is enabled.
"0" is displayed at all times when
PID control is based in deviation
input.
Using Pr.290 Monitor negative
output selection, minus values
*1 can be output to the terminal AM
and displayed on the operation
panel.
Even if minus display is enabled,
the display range is 900% to
1100% in monitors on the
operation panel. (0% is offset and
displayed as 1000%.)
page 415.)
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