Reference Point Return Parameters - Mitsubishi Electric MELDAS C6 Instruction Manual

3.3 Reference Point Return Parameters

(1) Reference point return operation and parameter related drawing
Basic machine coordinate
system zero point
Grid point
(2) G28 rapid traverse rate (#2025 G28rap)
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 parameters sets the approach speed (creep speed) to the reference point after
decelerating to a stop by the near-dog detection. The creep speed is accelerated and
decelerated in steps (acceleration/deceleration zero), so if the speed is fast, mechanical shock,
etc., could occur. The creep 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.
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3. Adjustment of Dog-type Reference Point Return
3.3 Reference Point Return Parameters
#2025 G28rap
G28 rapid traverse rate
#2029 grspc
Grid space
The grid between the
near-point dog and
grid mask is not the
electrical zero point.
search engine
#2030 dir (−) Reference point return direction
#2026 G28crp Approach speed
Grid mask
Near-point dog
#2028
grmask
Grid mask
amount
#2037 G53ofs Machine zero point offset
The grid amount is
displayed on the
"ALM/DIAG" "SERVO
MONITOR (2)" screen.
III - 10
Reference point
(Position returned to with
the zero point return
command)
Electrical zero point
#2027
G28sft
Grid Reference
amount point shift
amount
The first grid at the
end of the grid mask
is the electrical zero
point.