Mitsubishi Electric M800VS Series Connection And Set Up Manual page 492

M800VS/M80V Series Connection and Setup Manual
22 Setting the Position Detection System
22.2 Adjustment of Reference Position Return in Relative Position Detection System
(6) Set the decided grid mask amount for "#2028 grmask" of the [zero point parameter] screen.
(7) Turn the power OFF and ON, and then execute the reference position return.
(8) Confirm the grid space and grid amount values on DRIVE MONITOR screen.
If the grid amount value is approximately half of the grid space, the grid mask amount has been set correctly. If the value
is not approximately half, repeat the procedure from step (1).
(9) Set the reference position shift amount (#2027 G28sft).
To designate the electrical zero point as the reference position, set "#2027 G28sft" to "0".
(10) Turn the power OFF and ON, and then execute the reference position return.
Note
 The axis moves at the speed set in "#2025 G28rap G28 rapid traverse rate".
The parameter "#2025 G28rap G28 rapid traverse rate" is usually set to the maximum speed, which sets the reference
position return to high-speed movement for the second pass and later. Take extra care for the safe axis movement.
(11) Set the machine coordinate system offset amount (#2037 G53ofs).
Terms and parameters related to the dog-type reference position return
#2025 G28rap
Axis speed
(G28 rapid traverse rate)
Basic machine coordinate
system zero point
Grid point
Near-point dog
OFF
Switch
#2030 dir (-)
(Reference position
return direction)
[Electrical zero point]
The first grid point after the dog OFF.
If the grid point is at the position where the near-point dog is kicked OFF, the position of electrical zero point may be at the grid
point where the dog is kicked OFF or at the next grid point because of the delay of the limit switch operation. This causes a
deviation of reference position by the amount of the grid space.
Setting the grid mask amount ("#2028 grmask") prevents this deviation.
[Reference position]
The base for position and coordinate.
The axis is positioned to this position by the manual reference position return command or G28 command in the machining
program.
The position is determined by shifting from the electrical zero point by the amount of "#2027 G28sft Reference position shift
amount".
#2026 G28crp
(G28 approach speed)
Grid space
Grid mask
#2028 grmask
Grid mask
ON
Grid amount
amount
#2037 G53ofs
Electrical zero point
Reference position
(for the reference position return)
Position
#2027 G28sft
Reference position
shift distance
461 IB-1501613-A