
B-65395EN/01 START-UP PROCEDURE 3.START-UP PROCEDURE
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<7> Set the number of pulses per revolution
The number of pulses per revolution is calculated with
reduction ratios or leads of the ball screws and detection unit.
(Number of pulses per motor revolution)
= (amount of travel per motor revolution) / (detection unit)
Numerator for the number of pulses
per rotation
(Parameter No. 105) (≤32767)
Denominator for the number of
pulses per rotation
=
(Parameter No. 106) (≤32767)
(Parameter No. 179) (>32767)
=
(Parameter No. 106) (≤32767)
Example of setting)
Example: 10um detection in semi-closed loop
Ball screw lead Number of pulses per rotation
Numerator/denominator
10 (mm/rev)
20 (mm/rev)
30 (mm/rev)
10mm/10µm=1000/1
20mm/10µm=2000/1
30mm/10µm=3000/1
Example of setting)
1/100 degree detection with a deceleration ratio of 10:1 for a
rotation axis
Every time the motor makes one rotation, the table rotates through 360/10
degrees. The number of pulses per motor rotation is 360/10 ÷ (1/100) = 3600
pulses, so set the ollowing:Numerator = 3600, Denominator = 1
<8> Set the direction of motor travel in parameter No. 31.
111 Clockwise as viewed from the pulse coder
-111 Counterclockwise as viewed from the pulse coder
<9> Set the reference counter capacity. (Parameter No. 180)
Set the reference counter capacity when performing a
reference position return operation based on the grid method.
Set the number of position pulses per motor rotation, or set
that number divided by an integer.
Example of setting)
αi pulse coders, semi-closed loop (1µmm detection)
Ball screw lead
Number of
pulses per motor
revolution
Reference
counter
Grid width
10mm/revolution
20
30
10000/1
20000/1
30000/1
10000
20000
30000
10mm
20mm
30mm