Chapter 3 Wiring of Servo System IS620P User Manual
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3.6 Anti-interference Measures for Electrical Wiring
Take the following measures to suppress interference:
1. Use cables (such as reference input and encoder cables) as short as possible.
2. Use cables as thick as possible (> 2.0 mm
2
) for grounding.
a
.
D class (or higher class) grounding is recommended (grounding resistance is below 100
Ω).
b. Ground to one point only.
3. Use an EMI îš¿lter to prevent radio frequency interference. In home application or application
with noise interference, install the EMI îš¿lter on the input side of the power supply line.
4. To prevent malfunction due to electromagnetic interference, take the following measures:
a. Install the upper devices and EMI îš¿lter as close to the servo drive as possible.
b. Install a surge absorber on the relay, solenoid and electromagnetic contactor coils.
c. The distance between a strong-current cable and a weak-current cable shall be at least
30 cm. Do not run these cables in the same duct or bundle them together.
d. 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 an EMI îš¿lter on the
input side of the power supply line.
3.6.1 Anti-interference Wiring Example and Grounding
The servo drive uses high-speed switching element in the main circuit. Switching noise from
these elements may affect normal operation of the servo drive due to improper wiring or
grounding. Thus, the servo drive must be properly wired and grounded. An EMI îš¿lter can be
added if necessary.
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