Instruction manual

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3 DESIGN
3.2.1 Power supply circuit design
This section describes the protective coordination and noise suppression techniques of
the power supply circuit.
(1) Separation and protective coordination (leakage current protection,
over current protection) of power supply lines
Separate the lines for Multiple CPU system power supplies from the lines for I/O
devices and servo amplifiers as shown below.
When there is much noise, connect an insulation transformer.
100/200/400VAC
Multiple CPU
system
Isolation
transformer
PLC power
supply
Main power
supply
MCCB
Control power supply
for servo amplifier
Main circuit power supply
for servo amplifier
T1
CP
100/200VAC
CP
CP
CP
MCCB
Servo amplifier
Motor equipment
I/O equipment
I/O power supply
Motor power supply
(2) Grounding
The Motion system may malfunction as it is affected by various noises such as
electric path noises from the power supply lines, radiated and induced noises
from other equipment, servo amplifiers and their cables, and electromagnetic
noises from conductors. To avoid such troubles, connect the earthing ground of
each equipment and the shield grounds of the shielded cables to the earth.
For grounding, use the exclusive ground terminal wire of each equipment or a
single-point earth method to avoid grounding by common wiring, where possible,
since noises may sneak from other equipment due to common impedances.
Servo
motor
Servo amplifier
Line noise
filter
Multiple CPU
system
100/200VAC
SSCNET (/H)
(Note): Be sure to ground the line noise filter, Multiple CPU system, servo amplifier and
servomotor. (Ground resistance: 100
or less
)