Mitsubishi Electric FR-A820-00046 Instruction Manual page 717

Parameters
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 FM, 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 terminals FM
and CA.)
● Set the following values to Pr. 52 "Operation panel main monitor selection", Pr. 774 to Pr. 776
(Operation panel monitor selection), Pr. 992 "Operation panel setting dial push monitor selection",
Pr. 54 "FM/CA terminal function selection" and Pr. 158 "AM terminal function selection" for each
monitor.
Parameter
settings
52
92
53
93
67
95
54
94
91
96
Tab. 5-226: PID monitor function
When C42 (Pr. 934) and C44 (Pr. 935) are set, the minimum increment changes from unit % to no
unit, and the monitor range can be changed. (Refer to page 5-543.)
When the minus value display is set disabled using Pr. 290, the terminal AM output becomes "0".
Adjustment procedure
Enable PID control
Setting the parameter
Turn the X14 signal ON
FR-A800
Minimum
Monitor
incre-
description
ment
PID set point
0.1%
Second PID
set point
PID measured
value
0.1%
Second PID
measured
value
PID measured
value 2
0.1%
Second PID
measured
value 2
PID deviation
0.1%
Second PID
deviation
PID
manipulated
variable
0.1%
Second PID
manipulated
variable
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.
Adjust the PID control parameters of Pr. 127, Pr. 129 to Pr. 134, Pr. 553, Pr. 554, Pr. 575
to Pr. 577.
Set the I/O terminals for PID control. (Pr. 178 to Pr. 189 (input terminal function
Terminal setting
selection), Pr. 190 to Pr. 196 (output terminal function selection))
When the X14 signal is assigned to the input terminal, PID control is enabled by the
X14 signal turning ON.
Start
Monitor range
Terminal Terminal Operatio
FM/CA AM n panel
0 to 100%
0 to 100%
0 to 100%
900% to
Setting
-100% to 1100% or
not
-100% to
100%
available
100%
900% to
Setting
-100% to
1100% or
not
-100% to
100%
available
100%
(A) Application parameters
Remarks
"0" is displayed at all times when PID
control is based in deviation input.
Displays PID measured value even if 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 can be output to
the terminal AM and displayed on the
operation panel (FR-DU08).
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%.)
5 - 537