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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.
CMX
CDV
102760448
703125
146.1481927
.......................................................................................................... (5.2)
The result of reduction to provide no fraction for CMX is as follows.
CMX
CDV
102760448
703125
146.1459063
917504
6277.9
917504
6278
....................................................................... (5.3)
The result of reduction to provide no fraction for CDV is as follows.
CMX
CDV
102760448
703125
146.1482667
822083.6
5625
822084
5625
.................................................................... (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 servo motor revolution
AL: Moving distance per servo motor revolution
AM: Unit scale factor
Command
value
Control
unit
AP
AMAL
CMX
CDV
Deviation
counter
Electronic gear
Feedback pulse
Command
pulse
Servo amplifierAP75P
Servo motor
Electronic gear
The encoder resolution of the servo motor is 262144 pulses/rev. For example, the pulse command required
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 rotate the servo motor under the maximum output pulse
command of the QD75.
