Mitsubishi Electric 800 Series Instruction Manual page 339

NOTE
• While the integral stop is selected, the integral stop is enabled when any of the following conditions is met.
• The frequency reaches the upper or lower limit.
• The manipulated amount reaches plus or minus 100% (Pr.1015 = "0").
• The manipulated amount reaches 0% or 100% (Pr.1015 = "2").
 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 and AM.
• 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.)
• 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 terminal function selection and
Pr.158 AM terminal function selection for each monitor.
Parameter Monitor
Setting description
52 PID set point
PID measured
53
value
PID measured
67
value 2
54 PID deviation
PID manipulated
91
amount
*1 When C42 and C44 are set, the minimum increment changes from unit % to no unit, and the monitor range can be changed. (Refer to
*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.
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))
4.
Turing ON the X14 signal assigned to the input terminal
When the X14 signal is assigned to the input terminal, PID control is enabled by the X14 signal turning ON.
5.
Operation
338
14. (A) Application Parameters
14.4 PID control
Integral stop conditions
Monitor range
Minimum
increment
Terminal FM
*1
0.1%
0% to 100%
*1
0.1%
0% to 100%
-100% to
Setting not
0.1%
available
100%
-100% to
Setting not
0.1%
available
100%
Terminal Operation
AM panel
"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
900% to
selection, negative values can be output to
*1*2
1100%
the terminal AM.
The indicated values are from "900%" to
900% to
"1100%" on the operation panel. (0% is offset
*2
1100%
and displayed as "1000%".)
Remarks
page 342.)