5-8
IM WT5000-01EN
Linear Scaling of Analog Input
Set the input signal slope and offset when the input signal type is set to analog.
Set the input signal slope and offset also when the MTR configuration is set to auxiliary input (AUX) and the
input signal type is set to pulse.
The following two methods are available.
• Set the values manually.
• Specify two points, and use those points to compute the values.
Setting the Linear Scaling of Analog Input Manually (Linear Scale A, B)
You can set the slope (A) and offset (B) of the input signals to values within the following ranges.
Slope (A)
• When the MTR configuration is set to single motor (revolution signal: pulse), single motor (revolution signal:
analog), or double motor
1.000 m to 1.000 M
• When the MTR configuration is set to auxiliary input (Aux)
−1.000 M to 1.000 M
However, A cannot be set to zero.
Offset (B)
−1.000 M to 1.000 M
The following equation is used to compute the measured values of an input signal.
Measured values of an input signal = S(AX + B – NULL)
When the input signal type is set to analog
S: The scaling factor
A: The input signal slope
X: The input signal voltage
B: The offset
NULL: The
When the MTR configuration is set to auxiliary input (AUX) and the input signal type is set to pulse
S: The scaling factor
A: The pulse coefficient
X: The pulse frequency
B: The offset
NULL: The null value
When There Is No Offset in the Input Signal Voltage
If you set A to 1 and B to 0, the linear scaling settings do not affect computation, and the previous equation
becomes:
Measured values of an input signal = S(X – NULL)
The input signal is scaled when you set the scaling factor to the input signal per 1 V of input voltage.
When There Is Offset in the Input Signal Voltage
If you set S to 1, the scaling factor does not affect the computation, and the previous equation becomes
Measured values of an input signal = AX + B – NULL
The input signal is scaled when you set the input signal slope (A) to the input signal per 1 V of input voltage and
offset (B) to the offset value.
5 Motor Evaluation and Auxiliary Input (Option)
