6 Parameter Settings and Functions
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6.1.4 Input correction
This feature is used to compensate for input correction produced by thermocouples, RTDs, or
analog input devices, but NOT by the controller itself.
The input correction adjustments function is mainly used when the sensor cannot be attached
directly to control object. It is also used to compensate for temperature variance between the
sensor's installation point and the actual measuring point.
Setting group Parameter Setting range
Unit
Initial Setting Input Bias
-999 to 999 (H)
-999.9 to 999.9 (L)
0 Digit
If the controller displays 78℃ when the actual temperature is 80℃, set the input correction to 2
in order to adjust the controller's display temperature to 80℃.
Make sure that an accurate temperature variance measurement is taken before setting
values of Input Correction. An inaccurate initial measurement can lead to greater variance.
Many of today's temperature sensors are graded by their sensitivity. Since higher accuracy
usually comes at a higher cost, most people tend to choose sensors with medium sensitivity.
Measuring each sensor's sensitivity correction and using the Input Correction feature for
correction can ensure higher accuracy in temperature reading.
6.1.5 Input digital filter
It is not possible to perform high accuracy control if the PV (present value) fluctuates because of
noise elements, disturbance, or instabilities in the input signal. Using the Input Digital Filter
function can stabilize PV to realize more reliable control.
Setting group Parameter Setting range
Unit
Initial Setting Digital Filter 0.1 to 120.0 0.1 Sec.
When the Input Digital Filter is set to 0.4 seconds, the digital filter is applied according to a
sampling value collected over 0.4 seconds (400ms).
When the Input Digital Filter is used, PV (present value) can vary from the actual input value.
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