Setting Of Electronic Gear (For Melservo Series - Mitsubishi FX3G Series User Manual

FX /FX /FX PLC User's Manual - Positioning Control Edition
3G 3U 3UC
Built-in Positioning Functions
4.6.2

Setting of Electronic Gear (For MELSERVO Series)

Use the electronic gear of the servo motor to set the transfer distance per pulse.
For details on the electronic gear setting, refer to the manual of the servo motor or servo amplifier, and set an
optimum value depending on the application.
Setting example 1:
To set the transfer distance per pulse to 10 µm (if the machine uses a ball screw):
Machine specifications
Servo amplifier
Rated rotational speed of servo motor
Lead of ball screw (Pb)
Reduction ratio (mechanical gear) (n)
Resolution of servo motor (Pt)
CMX
×
=
0
CDV
Set the electronic gear as follows:
CMX = 8, CDV = 1
In this case, when the main unit outputs the maximum output
pulse frequency (100 kHz), the servo motor rotational speed
will be as follows:
CMX
×
N =
0
CDV
8
×
=
1
= 12000r/min > 3000r/min (Rated rotational speed of servo motor)
It is necessary to reduce the pulse frequency on the PLC side in order to reduce the servo motor rotational
speed so that it is less than the rated rotational speed.
Pulse output destination device
Y002
Y003
*1. Y002 (pulse output destination) cannot be specified when the 14-point or 24-point type FX
connected.
*2. Devices related to Y003 (pulse output destination) are only valid if two FX
connected to the FX
B - 66
Pt
×
-3
= 10×10
n×P
b
60
× f
0
Pt
60
× 100000
4000
Maximum speed setting device
Y000
Y001
*1
*2
PLC.
3U
4.6 Setting of Various Items on Servo Amplifier (Drive Unit) Side
MR-C Series
3000r/min
10mm (0.4")/rev
1/2
4000PLS/REV
4000 8
=
1
1/2×10
D8344,D8343
D8354,D8353
D8364,D8363
D8374,D8373
4 Before Programming
n
n=NL/NM=1/2
NL
NM
Servo motor
Pt = 4000 (PLS/REV)
f0 : Command pulse frequency [Hz]
(Open collector system)
CMX : Electronic gear
(numerator of command pulse
multiplying factor)
CDV : Electronic gear
(denominator of command pulse
multiplying factor)
N0 : Servo motor rotational speed [r/min]
0 : Transfer distance per pulse [mm]
-2HSY-ADP adapters are
3U
Pb=10[mm](0.4")
PLC is
3G