
B-63943EN-1/02 11.SPINDLE SPEED FUNCTION
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(2) Gear between spindle and position coder
The position coder is used to detect the position of the spindle.
The gear ratio between the spindle and position coder is set in
parameter No. 5221 to No. 5224 and No. 5231 to No. 5234.
When a position coder is externally attached, the gear ratio between
the spindle and position coder is not changed by a gear change
between the spindle motor and spindle. So, set the same number of
teeth in parameter No. 5221 to No. 5224 and No. 5231 to No. 5234.
When a position coder is built into a spindle motor, the gear ratio
between the spindle and position coder is changed by a gear change
between the spindle motor and spindle. So, set the number of teeth for
each gear in parameter No. 5221 to No. 5224 and No. 5231 to No.
5234.
Example of setting for the machining center system)
Spindle
motor
Built-in position coder
1st gear set 30 : 70
2nd gear set 50 : 50
3rd gear set 70 : 30
1st gear set
2nd gear set
3rd gear set
Spindle
Parameter No. Set value Meaning
5221 70
Number of teeth of the 1st gear for the
spindle side
5222 50
Number of teeth of the 2nd gear for the
spindle side
5223 30
Number of teeth of the 3rd gear for the
spindle side
5231 30
Number of teeth of the 1st gear for the
position coder side
5232 50
Number of teeth of the 2nd gear for the
position coder side
5233 70
Number of teeth of the 3rd gear for the
position coder side
For the lathe system, up to four gear stages can be set.