YOKOGAWA WT1800, User Manual

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4-2
IM WT1801-01EN
Setting the Scaling Factor for Scaling the Torque Signal
You can set the factor for scaling the torque signal to motor torque. Set the factor to a value from 0.0001 to
99999.9999.
• When the Torque Signal Type is Analog
This setting is used as the scaling factor in the equation for the linear scaling of analog input.
• When the Torque Signal Type is Pulse
This setting is used as the scaling factor in the equation for the torque signal pulse rating.
Setting the Scaling Factor for Computing the Motor Output
You can specify the scaling factor for computing the motor output (mechanical power) from the rotating speed
and torque. Set the factor to a value from 0.0001 to 99999.9999.
The equation is indicated below. The scaling factors of the rotating speed and torque are set so that the unit of
the rotating speed is min
–1
(or rpm) and the unit of torque is N•m. When the scaling factor of the motor output
specified here is 1, the unit of the motor output Pm is W. Because the efficiency computation uses W as the unit
of Pm, we recommend that you set the scaling factor of each item so that the unit of Pm is W.
2 π
60
Motor output Pm = ×Speed×Torque×S
Speed: The rotating speed, determined from the number of pulses per revolution
Torque: The torque, determined from the torque signal pulse rating
S:
The scaling factor
Unit (Unit)
• Number of characters: Up to eight
• Usable characters: Spaces and all characters that are displayed on the keyboard
Input Signal Type (Sense Type)
You can select which of the following two types of signals you want the WT1800 to receive from the revolution
sensor and torque meter.
• Analog: Select this option when the WT1800 will receive DC voltage (analog) signals.
• Pulse:
Select this option when the WT1800 will receive pulse signals.
Settings for Different Signal Types
As indicated below, the settings that you need to configure vary depending on the revolution and torque signal
type.
Settings Related to the Signal Type
Setting Signal Type
Analog Pulse
Analog auto range Yes No
Analog range Yes No
Linear scale A, B Yes No
Line filter Yes No
Synchronization source
— —
Pulse range No Yes
Number of pulses per revolution No Yes
Yes: Must be set.
No:
Does not need to be set.
—: Measurement can be performed when the sync source is set to None (the default setting), but you
can increase synchronicity with power measurement by specifying a sync source.
4 Motor Evaluation Conditions (Option)