Mitsubishi Electric MR-JN-40A - Page 106

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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
AP
AL AM
Control
unit
Electronic gear
Command
pulse
Servo motor
Deviation
counter
CMX
CDV
Electronic gear
Feedback pulse
Servo amplifier
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] Required pulse command
2000 10000 2000/60 333333 [pulse/s]
3000 10000 3000/60 500000 [pulse/s]
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.
f ꞏ
CMX
CDV
=
N
0
60
ꞏ 10000
f : Input pulse frequency [pulse/s]
N
0 : Servo motor speed [r/min]
200 ꞏ 10
3
ꞏ
CMX
CDV
=
3000
60
ꞏ 10000
CMX
CDV
=
3000
60
ꞏ
10000
200 ꞏ 10
3
=
3000 ꞏ 10000
60 ꞏ 200000
=
15
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