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3.  Adjustment of Dog-type Reference Point Return 

3.3  Reference Point Return Parameters 

 

 

 

III-10 

 

 
 

 

+

#2025  G28rap 
G28 rapid traverse rate 

#2030  dir (

−) Reference point return direction 

Reference point 
(Position returned to with the 
zero point return command)

 

#2026    G28crp G28 approach speed

 

Basic machine coordinate 
  system zero point

 

Electrical zero point 

Grid point

 

#2029  grspc

 

Grid space

 

Near-point dog

 

#2037  G53ofs  Machine zero point offset

Grid mask

 

Grid mask 
amount

 

Grid amount

 

Reference  
point shift 
amount 

The grid between the near-point
dog and grid mask is not the 
electrical zero point.

 

The first grid at the end of 
the grid mask is the 
electrical zero point.

 

The grid amount is displayed on 
the "ALM/DIAG"    "SERVO 
MONITOR (2)" screen. 

#2027 
 G28sft 

#2028 
 grmask 

 

 

 

This parameter designates the feedrate for dog-type reference point return in manual operation and 
automatic operation. 
The feedrate during high-speed reference point return will be the rapid traverse rate (SETUP PARAM. 
"#2001 rapid"). 

 
(3)  G28 approach speed (#2026 G28crp) 

This parameter sets the approach speed to the reference point after decelerating to a stop by the 
near-dog detection. The G28 approach speed is accelerated and decelerated in steps 
(acceleration/deceleration zero), so if the speed is fast, mechanical shock, etc., could occur. The G28 
approach speed should be set between 100 and 300 mm/min., and within 500 mm/min. at the fastest. 

 
(4)  Reference point shift amount (#2027 G28sft) 

This parameter can set the shift amount for shifting the reference point from the electrical zero point. 
The shift direction can be set only in the reference point return direction. 
If the reference point shift amount is "0", the grid point (electrical zero point) will be the reference point.