Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 758 / 1218

(A) Application parameters Parameters
5 - 556
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.
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 5-562.)
When the minus value display is set disabled using Pr. 290, the terminal AM output becomes "0".
Adjustment procedure
Parameter
settings
Monitor
description
Minimum
incre-
ment
Monitor range
Remarks
Terminal
FM/CA
Terminal
AM
Operatio
n panel
52 PID set point
0.1%
0 to 100%
"0" is displayed at all times when PID
control is based in deviation input.
92
Second PID
set point
53
PID measured
value
0.1% 0 to 100%
93
Second PID
measured
value
67
PID measured
value 2
0.1%
0 to 100%
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.
95
Second PID
measured
value 2
54 PID deviation
0.1%
Setting
not
available
-100% to
100%
900% to
1100% or
-100% to
100%
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%.)
94
Second PID
deviation
91
PID
manipulated
variable
0.1%
Setting
not
available
-100% to
100%
900% to
1100% or
-100% to
100%
96
Second PID
manipulated
variable
Tab. 5-231: PID monitor function
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.
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.
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 the X14 signal ON
When the X14 signal is assigned to the input terminal, PID control is enabled by the
X14 signal turning ON.
Start