Mitsubishi Electric MELSEC-L LD75D, User Manual

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CHAPTER 11 MANUAL CONTROL
11
11.
4 Man
ual
Puls
e
G
enerat
or O
p
erat
ion
(5) Manual pulse generator operation timing and processing time
The following drawing shows details of the manual pulse generator operation timing and processing time.
Normal timing times
• Delays may occur in the t1 timing time due to the operation status of other axes.
(6) Position control by manual pulse generator operation
In manual pulse generator operation, the position is moved by a "manual pulse generator 1 pulse movement
amount" per pulse.
The current feed value in the positioning control by manual pulse generator operation can be calculated using the
expression shown below.
Current feed value = Number of input pulses

[Cd.20] Manual pulse generator 1 pulse input magnification

Manual pulse generator 1 pulse movement amount
For example, when " Pr.1 Unit setting" is mm and "[Cd.20] Manual pulse generator 1 pulse input magnification" is
2, and 100 pulses are input from the manual pulse generator, the current feed value is as follows: 100

2

0.1 =
20 [

m] = 200 [Current feed value]
The number of pulses output actually to the drive unit is "Manual pulse generator 1 pulse movement
amount/movement amount per pulse
*1
". For example, when "[Pr.1] Unit setting" is mm and the movement
amount per pulse is 1

m, 0.1/1 = 1/10, i.e., the output to the drive unit per pulse from the manual pulse generator
is 1/10 pulse. Thus, the LD75 outputs 1 pulse to the drive unit after receiving 10 pulses from the manual pulse
generator.
*1
t1 t2 t3 t4
0 to 0.9ms 1.7 to 30.2ms 58.6 to 87.6ms 28.4 to 57.2ms
[Pr.1] Unit setting mm inch degree pulse
Manual pulse generator 1 pulse
movement amount
0.1

m 0.00001inch 0.00001degree 1pulse
t1
t3
t4
t2
0 0 1
Manual pulse generator input
pulses
BUSY signal
[XC,XD,XE,XF]
Start complete signal
[X10, X11, X12, X13]
Pulse output to external
source (PULSE)
Positioning operation
Manual pulse generator
enable flag
Axis operation status
Standby Standby Manual pulse generator operation
The start complete signal does not turn ON in manual pulse generator operation.
Cd. 21
Md. 26
Movement amount per pulse =
Pr.3
Pr.2
Movement amount per rotation
No. of pulses per rotation
× Pr.4 Unit magnification