4-3
IM WT1801-01EN
Common Settings Unrelated to the Signal Type
• Scaling factor
• Unit
• Motor poles
• Sync speed frequency measurement source
Analog Input Range
Set the analog input range for input signals whose type has been set to analog. For input signals whose type
has been set to pulse, there is no need to set the analog input range.
Turning Auto Range On and Off (Analog Auto Range)
Select whether to turn auto range on or off. When auto range is on, the WT1800 automatically switches between
the following ranges according to the size of the input signal.
20 V, 10 V, 5 V, 2 V, and 1 V
Range Increase
• The measurement range is increased when the rotating speed signal or torque signal exceeds 110% of the
measurement range.
• The measurement range is increased when the peak value of the input signal exceeds 150% of the
measurement range.
Range Decrease
The measurement range is decreased when the rotating speed signal or torque signal falls below 30% of the
measurement range and the peak value of the input signal is less than 125% of the lower range.
When non-periodic pulse waveforms are applied during auto range, the range may not remain constant. If this
happens, use the fixed range setting.
Fixed Range (Analog Range)
You can select one of the following input ranges.
20 V, 10 V, 5 V, 2 V, or 1 V
Linear Scaling of Analog Input
You can set the slope and the offset value of the input signal using one of the following two methods.
• Set the values manually.
• Specify two points, and use those points to compute the values
Manually Setting the Input Signal Slope and Offset (Linear Scale A, B)
You can set the slope (A) and offset (B) of the rotating speed and torque input signals to values within the
following ranges.
A: 1.000 m to 1.000 M
B: –1.000 M to 1.000 M
The following equation is used to compute the rotating speed and torque.
Rotating speed, torque = S(AX + B) – NULL
S: The scaling factor
A: The input signal slope
X: The input voltage from the revolution sensor or torque meter.
B: The offset
NULL:
4 Motor Evaluation Conditions (Option)
