
2. SETTING αiS/αiF/βiS SERIES SERVO PARAMETERS B-65270EN/05
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Example 1:
Parallel type, serial linear scale
If the ball screw used in direct coupling has a lead of 10 mm and
the separate detector used has a resolution of 0.5 µm per pulse
Number of position pulses = 10 / 0.0005 = 20,000
Example 2:
Serial rotary scale
If the motor-table gear reduction ratio is 10:1,
Number of position pulses = 12,500 × (1/10) = 1250
(b)-3 If the setting for the number of position pulses is larger than 32767
Conventionally, initialization bit 0 (high resolution bit) must be
changed according to the command unit. For the current
i series CNC,
however, there is no mutual dependence between the command unit
and initialization bit 0.
Of course, the conventional setting method is applicable, but using the
conversion coefficient for the number of position feedback pulses
makes the setting easier.
2628 (FS15i)
Conversion coefficient for the number of position feedback pulses
2185 (FS30i,16i)
Series 90E0, Series 90D0, Series 90B0, Series 90B5, Series 90B6,
Series 90B1 :
Set the number of position pulses with a product of two
parameters, using the conversion coefficient for the number of
position feedback pulses.
Number of feedback pulses per motor revolution, sent from the
separate detector
= Number of position pulses × Conversion coefficient for the
number of position feedback pulses
Series 9096 :
No conversion coefficient for the number of position feedback
pulses can be used. As usual, set the initialization bit 0 to 1, and
set the number of velocity pulses and the number of position
pulses to 1/10 the respective values stated earlier.
Number of feedback pulses per motor revolution, sent from the
separate detector
= Number of position pulses × 10
→ See Supplementary 3 of Subsection 2.1.8.