Mitsubishi Electric MELDAS 600M Series Instruction Manual page 397

4. Absolute Position Detection
4.1 Absolute position detection system
(1) Outline
The absolute position detection function detects the machine movement amount while the power
is OFF. This allows automatic operation to be started without carrying out reference point return
after the power is turned ON. This function carries out a mutual check of the feedback amount
from the detector, and checks the absolute position unique to the machine to ensure reliability.
To carry out absolute position detection, the zero point must be initialized to establish the absolute
position basic point.
The following methods can be used depending on how the absolute position basic point is
established.
(a) Dog-type absolute position detection
(b) Dogless-type absolute position detection
Downloaded from ManualsNet.com
4. Absolute Position Detection
The absolute position basic point can be established by executing dog-type reference point
return.
By initializing the zero point at the machine end or a random point, the absolute position basic
point can be established without using a dog. This eliminates the need to install a dog or a limit
switch on the machine, and simplifies the machine structure.
The following four methods can be used for the dogless-type zero point initialization.
Method
Machine end stopper method
Marked point alignment
method
Method/type
Machine end stopper method
Marked point alignment
method
Random point type
Grid point type
The validity and methods of the absolute position detection system can be selected with
parameters for each axis.
The servo amplifier and detector must have absolute position detection specifications.
search engine
CHAPTER 3 MAINTENANCE
Basic point type
Random point type
Grid point type
Random point type
Grid point type
The zero point is initialized by pushing against the machine
end stopper with manual movement.
A mark is applied at a random point in the machine's
moveable range, and the zero point is initialized by moving
to the marked point with manual movement.
The machine end or marked point is set as the absolute
position basic point.
The detector grid point near the machine end or marked
position is set as the absolute position basic point.
III – 11
Adjustment
procedures to be
referred
4.4 (1)
4.4 (2)
4.5 (1)
4.5 (2)
Details