
2. SETTING αiS/αiF/βiS SERIES SERVO PARAMETERS B-65270EN/05
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2.1.7 Setting Parameters when the PWM Distribution Module is
used
(1) Overview
The PWM distribution module (PDM) distributes a copy of a PWM
command for one axis received from the CNC to more than one servo
amplifier. When receiving current feedback signals from the servo
amplifiers, the PDM obtains an average current value per servo
amplifier and transfers it to the CNC. Since the CNC regards servo
amplifiers connected to the PDM as one axis, use of the PDM allows
large output by parallel driving without increasing the number of axes
controlled by the CNC.
The PDM is used mainly for driving a servo motor having four or
more windings (such as the α
iS2000/2000HV and
α
iS3000/2000HV).
Connection example:
X 000.000
Y 000.000
Z 000.000
MP
(X axis)
MP
(Z axis)
PDM
(Y axis)
Main
FSSB
Local
FSSB
MP
Slave 1
MP
Slave 2
MP
Slave 3
MP
Slave 4
Power
line
Pulsecoder
Feed back
Three slaves are recognized by the CNC.
CNC
PWM command for the
Y-axis is distributed to
multiple slaves.
Current values fed back by
slaves are averaged and
fed back to the Y-axis by
the PDM.
Servo motor (
2000/2000Hvis and so on)