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PLC User's Manual - Positioning Control Edition
Built-in Positioning Functions
4 Before Programming
4.6 Setting of Various Items on Servo Amplifier (Drive Unit) Side
B - 69
A
Common Items
B
Built-in
Positioning
Functions
Apx.
Example
Connection
Setting example 2:
To set the transfer distance per pulse to 0.01° (if a turntable is used):
Machine specifications
Set the electronic gear as follows:
CMX = 32768, CDV = 1125
In this case, when the main unit outputs the maximum output
pulse frequency (100 kHz), the servo motor rotational speed will
be as follows:
It is not necessary to restrict the maximum speed on the PLC side because the servo motor rotational speed
is less than the rated rotational speed.
4.6.3 Setting of "Servo Ready" Signal (MELSERVO MR-C Series)
If the following parameter is set as shown in the following table for the MELSERVO MR-C Series, pin 3 of the
CN1 connector of the servo amplifier will be changed to "servo ready" (RD). Note that the following parameter
should be set for the example programs shown in Chapter 12.
Servo amplifier MR-J2S Series
Rated rotational speed of servo motor 3000r/min
Turntable 360°/REV
Reduction ratio (mechanical gear) (n)
(Timing belt)
8/64
Resolution of servo motor (Pt) 131072PLS/REV
Series Parameter No. Setting value
MR-C
21 020
Turntable
Timing belt: 8/64
Servo motor
Pt = 131072 (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 [° ]
=
0
×
n
×
360
Pt
8/64
×
360
131072CMX
CDV
= 1
×
10
-2
×
=
1125
32768
×
CMX
CDV
N
0
=
60
Pt
×
f
0
=
××
100000
1333.33
r/min < 3000r/min (Rated rotational speed)
1125
32768
131072
60
.
.