Mitsubishi Electric MELSEC-LD77MS2 User Manual page 164

Unit setting
Pr.1
Set the unit used for defining positioning operations. Choose from the following
units depending on the type of the control target: mm, inch, degree, or PLS.
Different units can be defined for different axes.
(Example) Different units (mm, inch, degree, and PLS) are applicable to different
systems:
• mm or inch...... X-Y table, conveyor (Select mm or inch depending on
• degree ............ Rotating body (360 degrees/rotation)
• PLS ................. X-Y table, conveyor
: When you change the unit, note that the values of other parameters and data
will not be changed automatically.
After changing the unit, check if the parameter and data values are within the
allowable range.
Set "degree" to exercise speed-position switching control (ABS mode).
to Electronic gear (Movement amount per pulse)
Pr.2 Pr.4
Mechanical system value used when the Simple Motion module performs
positioning control.
The settings are made using
The electronic gear is expressed by the following equation.
Electronic gear =
Movement amount per rotation (AL)
: When positioning has been performed, an error (mechanical system error) may
be produced between the specified movement amount and the actual
movement amount. (Refer to Section 13.3.2 "Electronic gear function".)
POINT
(1) Set the electronic gear within the following range.
If the value outside the setting range is set, the error "Outside electronic gear
setting range" (error code: 907) will occur.
0.001  Electronic gear
: For the movement amount per rotation (AL) which is used for the calculation of the
electronic gear above, convert into the unit shown in the "Value set with sequence
program" of the table in "
magnification (AM)
(2) The result of below calculation (round up after decimal point) is a minimum
pulse when the current feed value is updated at follow-up processing. (The
movement amount for droop pulse is reflected as the current feed value when
the droop pulse becomes more than above calculated value in pulse unit of
motor end.)
Number of pulses per rotation (AP)
magnification (AM))[PLS]
Refer to Section 13.8.2 for the follow-up processing.
Chapter 5 Data Used for Positioning Control
the machine specifications.)
to
Pr.2 Pr.4
Number of pulses per rotation (AP)
AP
 
 320000
 
AL  AM
Pr.3 Movement amount per rotation (AL)
".
(Movement amount per rotation (AL)  Unit
5 - 24
.
Unit magnification (AM)
" and "
Pr.4 Unit