Encoder and resolver feedback cable for servo motor position sensing. Individual pair shielded, overall braid, PUR sheath. Highly flexible for drag chain and servo axis applications.
Encoder and resolver cables carry the position feedback signals from servo motor encoders back to the drive controller — signals that are low-voltage, high-frequency, and extremely sensitive to electromagnetic interference from the power conductors of the same servo axis. A poorly specified encoder cable is one of the most common causes of intermittent servo faults, following errors, and phantom position jumps in motion control systems.
Our encoder/resolver cables use individual pair foil screens with drain wires plus an overall tinned copper braid, combined with a flexible PUR outer sheath rated for continuous drag chain duty. Each pair is individually twisted to a specific pitch to maintain its characteristic impedance and inter-pair crosstalk performance across the full operating frequency range of the encoder signal.
| Parameter | Value |
|---|---|
| Rated Voltage | 300V |
| Test Voltage | 1.5 kV (1 min) |
| Conductor Cross-section | 0.14 – 0.5 mm² |
| Shielding | Individual foil per pair + overall Cu braid |
| Shield Coverage | ≥85% braid |
| Capacitance (pair-to-pair) | ≤120 pF/m |
| Loop Resistance (0.25 mm²) | ≤148 Ω/km |
| Flex Temp | −40°C to +80°C |
An overall braid alone does not prevent crosstalk between pairs inside the cable. In a standard multi-pair cable, the clock signal of an SSI encoder couples into the data pair, creating spurious position readings. Individual pair foil screens eliminate this internal crosstalk completely.
Generic instrumentation cables use Class 2 or Class 5 conductors that fatigue within weeks in continuous drag chain duty. Class 6 fine-stranded conductors in our encoder cable achieve >5 million flex cycles at the rated bending radius.
