SIGNALS AND WIRING
4-41
- SV Series User’s Manual -
4-8
Remedying Noise and High Harmonics
Remedyting Noises
According to the different conditions of surround wiring or equipment installation, servo amplifiers may be affected by noises.
Be sure to use the following countermeasure to prevent noises if necessary.
• Input command equipments and noise filters should be installed as near the servo amplifier as possible.
• Coils of relays, solenoids, electromagnetic contactors must use anti-surge countermeasures.
• Main/control circuit power cables and I/O cables should be wired with a spacing of above 30cm. The two cables can
not be inserted into one duct or bundled together.
• It should be separated from power supply of welding machine, electric discharge machine and other noise sources.
Even in conditions that power is separated, when there is high frequency generator nearby, be sure to connect
noise filter at the input side of main/control circuit power cables.
• Be sure to use proper grounding.
■ Noise filter
Be sure to connect noise filter at proper position in order to avoid the influence of noise on servo amplifiers.
About wiring method when noise filter is used, please refer to the following example.
*1 Be sure to use flat braided copper conductor (> 3.5mm
2
) for FG.
*2 Be sure to use twisted-pair cable for wring.
● When electromagnetic brake servo motor (< 400W) is used
Noise filter should also be used for the power supply of electromagnetic brake when electromagnetic brake servo
motor (< 400W) is used.
C200V
MC: Electromagnetic contactor
Control panel
> 3.5mm
2*1
> 3.5mm
2*1
> 2mm
2
> 2.0mm
2
> 3.5mm
2
> 3.5mm
2*1
Noise filter
Servo amplifier
Servo motor
L1
L2
L1C
L2C
I/O connector
Encoder
Connector
L3
U
V
W
M
Enc
(FG)
Operation relay sequence
*2
DC power
supply
(Grounding)
Noise filter
*2
Electromagnetic contactor
Emergency stop
Main circuit
ON
Main
circuit OFF
Alarm relay
MC
MC
Surge suppressor
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