Mitsubishi Electric MELSERVO-JN Series Instruction Manual page 106

4. PARAMETERS
(2) Setting for use of QD75
The QD75 also has the following electronic gear parameters. Normally, the servo amplifier side electronic
gear must also be set due to the restriction on the command pulse frequency (differential 1Mpulse/s, open
collector 200kpulse/s).
AP: Number of pulses per motor revolution
AL: Moving distance per motor revolution
AM: Unit scale factor
QD75
Command
value
Control
unit
For example, if 100 (1000[pulse/rev]) is set to parameter No. PA05, the pulse command required to rotate
the servo motor is as follows.
Servo motor speed [r/min]
2000
3000
Use the electronic gear of the servo amplifier to rotate the servo motor under the maximum output pulse
command of the QD75.
To rotate the servo motor at 3000r/min in the open collector system (200kpulse/s), set the electronic gear
as follows.
CMX N
0
f ꞏ CDV = 60 ꞏ 10000
f : Input pulse frequency [pulse/s]
N : Servo motor speed [r/min]
0
CMX
200 ꞏ 10 3 ꞏ CDV =
CMX 3000
CDV = ꞏ
60
200 ꞏ 10
AP
Command
AL AM
pulse
Electronic gear
10000 2000/60 333333 [pulse/s]
10000 3000/60 500000 [pulse/s]
3000
ꞏ 10000
60
10000 3000 ꞏ 10000
= 60 ꞏ 200000 =
3
Servo amplifier
CMX
Deviation
counter
CDV
Feedback pulse
Electronic gear
Required pulse command
15
6
4 - 9
Servo motor