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Is the encoder cable routed through the low-voltage cable tray

Fiber and communications infrastructure knowledge brief Published 12 Oct 2024

Prepared for preliminary research by the METRA knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Encoder cables should generally not be routed through the same low-voltage cable tray as power cables to minimize electromagnetic interference (EMI) and ensure signal integrity.

Best Practices for Encoder Cable Routing

Separation from Power Cables: Encoder feedback cables carry low-voltage, low-current signals that are highly susceptible to EMI from nearby power cables, especially those supplying motors or high-current loads. To reduce noise, encoder cables should be routed separately from power cables, maintaining a recommended separation distance of 6–12 inches (15–30 cm) whenever possible. If crossing is unavoidable, it should be done at a 90-degree angle to minimize coupling.

Shielding and Grounding: Encoder cables should be shielded, with the shield typically grounded at the controller side. Twisted-pair wiring and individually shielded wires can further enhance noise immunity, particularly in high-noise environments. Cable Tray Considerations: While low-voltage cable trays are used for control and communication wiring, encoder cables should ideally have their own dedicated tray or conduit.

Running encoder cables in the same tray as power cables is discouraged because it increases the risk of signal degradation and false readings. Standards Compliance: Industry standards such as IEC 60204-1 and NFPA 79 recommend separate routing for signal and power cables in industrial environments to ensure reliable operation and minimize EMI. Additional Recommendations: For long cable runs, use high-quality, low-capacitance, shielded twisted-pair cables.

Differential encoders with complementary channels (A,/A, B,/B, Z,/Z) can further reduce susceptibility to noise. Fiber optic solutions may be considered for extreme distances or high-noise environments.

Conclusion

Routing encoder cables through a low-voltage cable tray shared with power cables is not recommended. For optimal performance and reliability, encoder cables should be routed separately, shielded, and grounded according to manufacturer guidelines and industry standards. This approach ensures accurate signal transmission and minimizes the risk of EMI-induced errors.

Is the encoder cable routed through the low-voltage cable tray - METRA FIBER MARKET [PDF]

Is the encoder cable routed through the low-voltage cable tray
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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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