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ProNet Plus Series AC Servo User's Manual
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3.6 Wiring for Noise Control
3.6.1 Noise Control
The servodrive uses high-speed switching elements in the main circuit. It may receive "switching noise"from these
high-speed switching elements.
To prevent malfunction due to noise, take the following actions:
• Position the input reference device and noise filter as close to the servo drive as possible.
• Always install a surge absorber in the relay, solenoid and electromagnetic contactor coils.
• The distance between a power line (servomotor main circuit cable) and a signal line must be at least 30 cm.Do not put
the power and signal lines in the same duct or bundle them together.
• Do not share the power supply with an electric welder or electrical discharge machine. When the servo drive is placed
near a high-frequency generator, install a noise filter on the input side of the power supplyline. As for the wiring of noise
filter, refer to (1) Noise Filter shown below.
• For proper grounding technique, refer to
(2) Correct Grounding.
(1) Noise Filter
Please install a noise filter in the appropriate place to protect the servo drive from external noise interference.
Notice:
AC 200V
AC 400V
Servo Drive
PG
Noise filter
*
3
2
*
1
Operation relay sequence
Signal generation circuit
*
3
*
2
Noise
filter
DC
power
*
1
(ground plate)
Wires of
*
1
Ground: Ground to an independent ground
L1
L2
L3


CN1
CN2
M
(FG)
Servomotor
(ground plate) (ground
plate)
(ground plate)
(ground plate)
3.5mm min.
2 3.5mm min.
2 3.5mm min.
2
3.5mm min.
2
2mm min.
•For ground wires connected to the ground plate, use a thick wire with a thickness of at least 3.5 mm
2
(preferably, plain
stitch cooper wire)
•
should be twisted-pair wires.
•When using a noise filter, follow the precautions in
3.6.2 Precautions on Connecting Noise Filter .