
4.REFERENCE POSITION ESTABLISHMENT B-63943EN-1/02
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To shift the reference position beyond the distance to the first grid
point, select the method by reference position shift and set bit 4
(SFDx) of parameter No. 1008 to 1.
Either of the methods for adjusting the reference position is available.
- Adjusting the reference position by grid shift
With the method for shifting the reference position by grid shift, the
grid position can be shifted by the distance set in parameter No. 1850.
The distance by which the grid is to be shifted must not exceed the
reference counter capacity (parameter No. 1821).
- Adjusting the reference position by reference position shift
With the method for shifting the reference position by reference
position shift, the distance by which the reference position is to be
shifted can be set in a parameter to shift it without moving the
deceleration dog.
This function is enabled by setting bit 4 (SFDx) of parameter No.
1008.
The distance by which the reference position is to be shifted, shown in
the figure below, can be set in parameter No. 1850 to shift the
reference position.
The distance L
DEC for the axis along which reference position return is
performed is automatically stored in parameter No. 1844.
Deceleration dog
Reference position
Grid point
Reference position return direction
L
DEC
L
DEC
:
Distance from the end of the deceleration dog to the first grid point after
that when the distance by which the reference position is to be shifted is 0
L
SFT
: Distance by which the reference position is to be shifted
(parameter No. 1850)
L
SFT
1 Set the following parameter. After setting, turn the power off,
then on again.
Set bit 4 (SFDx) of parameter No. 1008 to 1.
The distance from the end of the deceleration dog to the first grid
point after that (L
DEC (parameter No. 1844)) is 0 when the distance
by which the reference position is to be shifted is 0.
Set the distance by which the reference position is to be shifted
(parameter No. 1850) to 0.
2 Perform reference position return. The machine stops at the first
grid point after leaving the deceleration dog.
The distance L
DEC is automatically set in parameter No. 1844.