Mitsubishi Electric MELSEC-Q QD75M User Manual page 114

5 DATA USED FOR POSITIONING CONTROL
Pr.2 to Pr.4 Electronic gear
Mechanical system value used when the QD75 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 12.3.2 "Electronic gear function".)
Pr.2 No. of pulses per rotation (AP)
Set the number of pulses required for a complete rotation of the motor shaft.
If you are using the Mitsubishi servo amplifier MR-H-BN/MR-J2-B/MR-J2S-B/MR-
J2-03B5 set the value given as the "resolution per servomotor rotation" in the
speed/position detector specifications.
No. of pulses per rotation (AP) = Resolution per servomotor rotation
[Table 1]
Pr.1
setting value
0 : mm
1 : inch
2 : degree
3 : PLS
Pr.3 Movement amount per rotation (AL), Pr.4 Unit magnification (AM)
The amount how the workpiece moves with one motor rotation is determined by
the mechanical structure.
If the worm gear lead ( µ m/rev) is PB and the deceleration rate is 1/n, then
Movement amount per rotation (AL) = PB × 1/n
Pr.2
to Pr.4
No. of pulses per rotation (AP)
Value set with peripheral device
(unit)
0.1 to 2000000.0 ( µ m)
0.00001 to 2000.00000 (inch)
0.00001 to 2000.00000 (degree)
1 to 200000000 (PLS)
5 - 23
MELSEC-Q
.
Unit magnification (AM)
Value set with PLC program
(unit) 1
1 to 200000000 ( × 10
1 to 200000000 ( × 10
1 to 200000000 ( × 10
1 to 200000000 (PLS)
µ m)
-1
-5
inch)
-5
degree)