6 Parameter Settings and Functions
© Copyright Reserved Autonics Co., Ltd. 47
6.1.4 Input Bias Settings
This feature is used to compensate for input bias produced by thermocouples, RTDs,
or analog input devices, but NOT by the controller itself.
The input bias 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.
Group Parameter Range
Factory
Default
Unit
Initial Setting Group 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 bias 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 Bias. 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 bias and using
the Input Bias 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.
Group Parameter Range
Factory
Default
Unit
Initial Setting Group Input Digital Filter 0.1~ 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 (400
ms).
When the Input Digital Filter is used, PV (Present Value) can vary from
the actual input value.
To Next Page
Loading...
Need help?
General
