
4. DESCRIPTION OF PARAMETERS
B–63980EN/01
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Table 4.13 Backlash Compensating Value
Change of feedrate
Change of direction of movement
Cutting feed to
cutting feed
Rapid traverse
to rapid traverse
Rapid traverse to
cutting feed
Cutting feed to
rapid traverse
Same direction 0 0 ±α ± (–α)
Opposite direction ±A ±B ±B (B+α) ±B (B+α)
α = (A–B)/2
The positive or negative direction for compensating
values is the direction of movement.
(α : Overrun)
a
a
A
B
Stopped during cutting feed Stopped during rapid traverse
Assign the measured backlash at cutting feed (A) in parameter No.1851 and that at rapid traverse (B) in param-
eter No.1852.
NOTE
1 Jog feed is regarded as cutting feed.
2 The backlash compensation depending on a rapid traverse and a cutting feed is not performed
until the first reference position return is completed after the power is turned on. The normal
backlash compensation is performed according to the value specified in parameter No.1851
irrespective of a rapid traverse and a cutting feed.
3 The backlash compensation depending on a rapid traverse and a cutting feed is performed only
when RBK, #4 of parameter No.1800, is set to 1. When RBK is set to 0, the normal backlash
is performed.
1874 Number of the conversion coefficient for inductosyn position detection
1875 Denominator of the conversion coefficient for inductosyn position detection
NOTE
When this parameter has been set, the power must be
turned off before operation is continued.
[Data type] Word axis
[Valid data range] 1 to 32767
Set a conversion coefficient for inductosyn position detection for each
axis. The value set is determined as follows:
=
Number of position feedback pulses per motor revolution
1,000,000
No. 1874
No. 1875