498
Adjustment procedure
Calibration example
Adjust room temperature to 25°C by PID control using a detector that outputs 4 mA at 0°C and 20 mA at 50°C.)
When calibration is required
Calibrate detector output and set point input by
Pr.125, Pr.902, and Pr.903
(terminal 2), or
Pr.126, Pr.904, and Pr.905
(terminal 4). (Refer to
.)
When both
Pr.934 and Pr.935
are other than "9999", calibrate the detector output and set point input by
Pr.934 and Pr.935
(terminal 4). (Refer
Make calibration in the PU operation mode during an inverter stop.
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
Detector specifications
When 0°C 4mA and 50°C 20mA are used, the set point 25°C is 50%
on the assumption that 4mA is 0% and 20mA is 100%.
Start
Determination of set point
Conversion of set point into %
Make calibration.
Setting of set point
Operation
Is the set point stable?
Parameter adjustment
Parameter optimization
Adjustment end
Yes
No
Determine the set point of what is
desired to be adjusted.
Calculate the ratio of the set point to
the detector output.
Input a voltage across terminals 2-5
according to the set value %.
To stabilize the measured value, change
the proportional band (
Pr. 129
) to a larger
value, the integral time (
Pr. 130
) to a
slightly longer time, and the differential
time (
Pr. 134
) to a slightly shorter time.
While the measured value is stable
throughout the operation status, the
proportional band (
Pr. 129
) may be
decreased, the integral time (
Pr. 130
)
decreased, and the differential time (
Pr. 134
)
may be increased.
Set the proportional band (
Pr. 129
)
to a slightly larger value, the integral
time (
Pr. 130
) to a slightly longer
time, and the differential time (
Pr.
134
) to "9999" (no function), and turn
ON the start signal.
Set the room temperature to 25°C.
Make the following calibration
∗1
when the target setting input (0 to 5 V)
and detector output (4 to 20mA) must be calibrated.
When performing operation, first set the proportional band (
Pr. 129
) to a slightly larger value, the integral time
(
Pr. 130
) to a slightly longer time, and the differential time (
Pr. 134
) to "9999" (no function), and while looking
at the system operation, decrease the proportional band (
Pr. 129
) and increase the integral time (
Pr. 130
).
For slow response system where a deadband exists, differential control (
Pr. 134
) should be turned ON and
increased slowly.
• To set the set point to 50% using voltage input
The terminal 2 specification is 0 V for 0%, and 5 V for 100%. Thus, to set to 50%, input 2.5 V to the terminal 2.
• To set the set point to 50% using parameters
Set
Pr.133
= "50". (If
Pr.934
and
Pr.935
≠ "9999", set "25 (no % conversion)" directly in
Pr.133
.)
Summary of Contents for 800 Series
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