Yaskawa MP930 - Manual (Page 225)

6.1 Support Functions for Controlled Axes
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6.1.2 Electronic Gear
An electronic gear converts position or speed units into user units (reference units) and internal
controller units (pulse units), and it converts pulse units into reference units. The electronic
gear function is not used to select a detector (encoder) suitable for the machine system but rath-
er for positioning control.
Forward Direction Electronic Gear Conversion
Controller units [pulses] = × Reference units position [reference units]
Electronic gear numerator
Electronic gear denominator
Reverse Direction Electronic Gear Conversion
User reference units position = × Controller internal unit position
Electronic gear numerator
Electronic gear denominator
[reference units] [pulses]
D Electronic gear numerator = Gear ratio on the Servomotor end ¢ Number of pulses per
Servomotor 1 rotation (multiplied by the multiplier)
D Electronic gear numerator = Gear ratio on the machine end ¢ Distance traveled per one
machine rotation
Electronic Gear Concept
Number of pulses per one Servomotor rotation (multiplied by the multiplier)
Servomotor
Gear ratio on the Servomotor end (*1)
Gear ratio on the machine end *1 Distance traveled per one machine rotation
PG
Positioning speed
* When the electronic gear system is structured so that the shaft on the machine end
will turn n times whenthe shafton the Servomotor endturns mtimes, mis the Servo-
motor-end gear ratio and n is the machine-end gear ratio.
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