4-40
4-3 Wiring Conforming to EMC Directives
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.
Dimensions
Impedance Characteristics
Manufacturer Product name Model Specifications
NEC TOKIN Clamp Filters ESD-SR-250
For cable diameter up to
13 mm
TDK Clamp Filters ZCAT3035-1330
For cable diameter up to
13 mm
31.5
~13
dia.
31.6
38.0
ESD-SR-250
10000
1000
100
10
1
Impedance(Ω)
10 100
Frequency (MHz)
1 1000
ESD-SR-250
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