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1.7 Setting the Scaling Factor and Unit
Explanation
1-20
• Setting the Scaling Factor Used to Transform the Revolution Signal
Set the factor used to transform the revolution signal. Set the value in the range of
0.0001 to 99999.9999.
• When the Revolution Signal Type is Analog
By setting the number of rotations per volt of input voltage, the rotating speed is
derived from the following equation.
Rotating speed = Input voltage from the revolution sensor × scaling factor
• When the Revolution Signal Type is Pulse
The value is used as a scaling factor in the equation given in "Setting the Rotation
Pulse Count" in section 1.6
• Setting the Scaling Factor Used to Transform the Torque Signal
You can specify the scaling factor used to transform the torque signal to the torque of
the motor. Set the value in the range of 0.0001 to 99999.9999.
• When the Torque Signal Type is Analog
By setting the torque per volt of input voltage, the torque is derived from the input
voltage from the torque meter using the following equation.
Torque = Input voltage from the torque meter × scaling factor
• When the Torque Signal Type is Pulse
The value is used as a scaling factor in the equation given in "Setting the Torque
Signal Pulse Count" in section 1.6
• Setting the Scaling Factor Used to Compute the Motor Output
You can specify the scaling factor used to compute the motor output (mechanical
power) from the rotating speed and torque. Set the value in the range of 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
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 in section 1.9 is computed with the unit
of Pm to be W, it is recommended that the scaling factor of each item be set so that
the unit of Pm is W.
Motor output Pm =
• Setting the Unit of Rotating Speed, Torque, and Motor Output
• Number of Characters
Eight characters or less.
• Types of Characters
Characters that are displayed on the keyboard or spaces.
*1
2 × π × rotating speed
× scaling factor × torque
60
*1 Rotating speed derived in section 1.6.
*2 Torque derived in section 1.6.
–1
(or rpm) and the unit of torque
*2
IM WT3001E-51EN
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