
B-63323EN-1/03 1.AXIS CONTROL
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1.5.1 Servo Parameter
Overview
This section explains the main servo parameters. For an explanation of
servo parameters not mentioned here, refer to the "AC Servo Motor α
series Parameter Manual (B-65150E)".
- Command multiply (CMR), detection multiply (DMR), and reference counter
capacity
Command
pulse
Least
command
increment
× CMR
Reference
counter
Error counter
DA
conversion
× DMR
Position
detector
To
speed
control
Return pulse
Detection unit
-
+
Fig. 1.5.1 (a)
Set the CMR and DMR magnifications so that the weight of the pulses
of the + input to the error counter (commands from the CNC) is the
same as that of the pulses of the - input (return from the detector).
[Least command increment]/CMR = [Detection unit] = [Return
pulse unit]/DMR
The return pulse unit differs with the type of detector.
[Return pulse unit] = (Amount of travel per rotation of the pulse
coder)/(Number of pulses per rotation of the pulse coder)
For the reference counter capacity, specify the grid interval for a
reference position return of the grid method.
(Reference counter capacity) = (Grid interval)/[Detection unit]
(Grid interval) = (Amount of travel per rotation of the pulse coder