5 - 8
5. PARAMETERS
(2) Instructions for reduction
The calculated value before reduction must be as near as possible to the calculated value after reduction.
In the case of (1), (b) in this section, an error will be smaller if reduction is made to provide no fraction for
CDV. The fraction of Expression (5.1) before reduction is calculated as follows.
CDV
CMX
102760488
7023125
146.1481927 ..................................................................................................... (5.2)
The result of reduction to provide no fraction for CMX is as follows.
CDV
CMX
102760488
7023125
917504
6277.9
917504
62778
146.1459063...................................................................... (5.3)
The result of reduction to provide no fraction for CDV is as follows.
CDV
CMX
102760488
7023125
822083.6
5625
822084
5625
146.1482667 .................................................................... (5.4)
As a result, it is understood that the value nearer to the calculation result of Expression (5.2) is the result
of Expression (5.4). Accordingly, the set values of (1), (b) in this section are CMX 822084, CDV 5625.
(3) 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
Command
value
Control
unit
AP
AM
AL
CMX
CDV
Deviation
counter
Electronic gear Feedback pulse
Command
pulse
Servo amplifier
AP75P
Servo motor
Electronic gear
The resolution of the servo motor is 262144 pulses/rev. For example, the pulse command needed to
rotate the servo motor is as follows
Servo motor speed [r/min]
Required pulse command
2000 262144 2000/60 8738133 pulse/s
3000 262144 3000/60 13107200 pulse/s
Use the electronic gear of the servo amplifier to run the servo motor under the maximum output pulse
command of the QD75.
Summary of Contents for MELSERVO MR-J3 A Series
Page 15: ...A 14 MEMO ...
Page 225: ...7 12 7 GENERAL GAIN ADJUSTMENT MEMO ...
Page 241: ...8 16 8 SPECIAL ADJUSTMENT FUNCTIONS MEMO ...
Page 251: ...9 10 9 TROUBLESHOOTING MEMO ...
Page 263: ...10 12 10 OUTLINE DRAWINGS MEMO ...