Mitsubishi Electric 700 Series, Instruction Manual

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269
PID control
4
P
ARA
MET
E
RS
(8) PID monitor function
⋅
The PID control set value, measured value and deviation value can be displayed on the operation panel and output
from terminal CA, AM.
⋅
Integral value indicating a negative % can be displayed on the deviation monitor. 0% is displayed as 1000. (The
deviation monitor cannot be output from the terminal CA, AM.)
⋅
For the monitors, set the following values in Pr. 52 DU/PU main display data selection , Pr. 54 CA terminal function
selection , and Pr. 158 AM terminal function selection .
* When neither of C42(Pr.934) nor C44(Pr.935) setting is "9999", minimum increment changes from % to no unit, and the full scale value for
terminal CA/AM changes from 100% to the larger value between C42(Pr.934) PID display bias coefficient and C44(Pr.935) PID display gain
coefficient . (The smaller value between C42(Pr.934) and C44(Pr.935) becomes the minimum value.)
(9) Adjustment procedure
Setting Monitor Description
Minimum
Increments*
Terminal CA, AM
Full Scale*
Remarks
52 PID set point
0.1
100%/ C42(Pr.934) or
C44(Pr.935)
For deviation input ( Pr. 128 = 10, 11, 110, 111), the monitor
value is always displayed as 0.
For the setting value "67", monitoring is available even
when PID control is inactive.
53 PID measured value
67 PID measured value 2
54 PID deviation 0.1 —
Value cannot be set to Pr. 54 or Pr. 158 .
The PID deviation value of 0% is displayed as 1000.
Parameter setting
Adjust the PID control parameters, Pr. 127 to Pr. 134 , Pr. 553, Pr. 554, and
Pr. 575 to Pr. 577
.
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))
Turn ON the X14 signal.
PID control is available without turning X14 signal ON when Pr.128 =
"50, 51, 60, 61, 110, 111, 120, 121".
Operation