
B-63323EN-1/03 4.REFERENCE POSITION ESTABLISHMENT
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4.3 REFERENCE POSITION SHIFT
General
When reference position return is performed using a grid method, the
reference position can be shifted by a parameter-set distance without
having to move the deceleration dog.
This function is enabled by setting bit 4 of parameter No. 1008 (SFD)
to 1. When distance LSFT, shown below, is set in parameter No. 1850,
the reference position can be shifted.
Finally, the grid shift amount for the axis that has returned to the
reference position, as shown in the figure below, is saved automatically
with parameter No. 1844.
How to adjust the reference position
Two reference position shift adjustment procedures are supported.
One procedure uses the reference position adjustment signal, while the
other does not use the reference position adjustment signal.
- Adjustment procedure not using the reference position adjustment signal
1 Set the parameters below. After setting these parameters, turn the
power off then back on to make the settings effective.
Bit 4 (SFD) of parameter No. 1008 = 1
Grid shift amount (parameter No. 1844) = 0
Reference position shift amount (parameter No. 1850) = 0
2 Perform reference position return. The machine stops at the first
grid point after leaving the deceleration dog. A grid shift amount is
set automatically, and is indicated in diagnosis No. 3008.
3 Find the distance from the stop position to the reference position
(reference position shift amount), then set the distance in parameter
No. 1850. Then, turn off the power before operation is continued.
This completes reference position adjustment.
Deceleration dog
Reference position
Grid point
Stop position (reference position shift amount=0)
Reference position shift amount
Grid shift amount: Distance to the first grid point after the deceleration dog is
turned off when the reference position shift amount is 0
Direction of reference
position return
Grid shift amount