Yaskawa MP940 - Manual (Page 130)

4.4 CNTR Function
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4
„ Setting the Electronic Gear
Use the following procedure (steps 1 to 6) to set the electronic gear.
1. Check the machine specifications.
Items related to electronic gear:
• Gear ratio
• Ball screw pitch
• Pulley diameter, etc.
2. Check the number of encoder pulses input to the Counter, and set the number in fixed
parameter 9 (Pulse number per one cycle of the encoder).
3. Determine the reference unit to be used.
A reference unit is the minimum unit of position data used for moving the load (Mini-
mum unit of reference from the host controller).
• One pulse of a reference input of 0.01 mm, 0.001 mm, , or 0.01 inch moves the
load by one reference unit.
• When reference unit is 1 µm:
If a reference of 50,000 pulses is input, the load moves 50 mm (50,000 x 1 µm).
4. Determine the load travel distance per revolution of load shaft in reference units.
Gear rate
Ball screw pitch
x
To move a table in units of
0.001 mm:
Reference unit: 0.001 mm
Determine the reference unit according to
machine specifications and positioning
accuracy.
0.1 °
Load travel distance per revolution of load
shaft (in unit of distance)
Reference unit
Load travel distance per revolution of load shaft
(in reference units)
=