228
Special operation and frequency control
(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 FM, AM.
⋅
The deviation monitor can display a negative value on the assumption that 1000 is 0%. (The deviation monitor
cannot be output from the terminal FM, AM.)
⋅
For the monitors, set the following values in
Pr. 52 DU/PU main display data selection
,
Pr. 54 FM 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 FM/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 FM, 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.
53
PID measured value
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
