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4-3 Wiring Conforming to EMC Directives
Accurax G5 AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
4
System Design
Improving Encoder Cable Noise Resistance
Take the following steps during wiring and installation to improve the encoder's noise
resistance.
Always use the specified encoder cables.
If cables are joined midway, be sure to use connectors. And do not remove more than 50 mm of
the cable insulation. In addition, always use shielded cables.
Do not coil cables. If cables are long and are coiled, mutual induction and inductance will increase
and cause malfunctions. Always use cables fully extended.
When installing noise filters for encoder cables, use clamp filters.
The following table shows the recommended clamp filters.
Do not place the encoder cable with the following cables in the same duct.
Control cables for brakes, solenoids, clutches, and valves.
External Dimensions
Impedance Characteristics
Manufacturer Product name Model Specifications
NEC TOKIN Clamp filters ESD-SR-250
For cable dia. up to 13 mm
TDK Clamp filters ZCAT3035-1330
For cable dia. up to 13 mm
31.5
to φ13
31.6
38.0
ESD-SR-250
10000
1000
100
10
1
Impedance (Ω)
10 100
Frequency (MHz)
11000
ESD-SR-250
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