RKG0039 by Bosch Rexroth Indramat

The RKG0039 is an encoder feedback cable produced by Bosch Rexroth Indramat for the RKG Encoder Cables series. It carries incremental or absolute position signals from a motor-mounted encoder to the drive controller while also supplying sensor power, consolidating multiple functions into one flexible line. This layout reduces installation space and minimizes wiring errors in automated assembly stations, gantry systems, and other motion axes where continual flexing and reliable data transmission are required.

The cable is rated for 5,000,000 bending cycles, a figure that indicates how many articulations it can endure in cable carrier applications before conductor fatigue becomes critical. Its eight-core layout of 4×2×0.25 mm² + 2×0.5 mm² separates differential signal pairs from the auxiliary power conductors to control crosstalk. Each 0.25 mm² signal conductor exhibits a resistance of 83.0 ?/km, limiting voltage drop over long runs and preserving encoder accuracy. On the controller end, a D-sub 15-pin molded connector mates directly with Indramat drive interfaces, eliminating field termination. Despite the internal pair shielding and filler materials, the assembly maintains a compact 8.8 mm overall diameter, allowing tight bend radii inside drag chains and control cabinets.

Mechanical resilience is paired with chemical protection measures. A PUR jacket resists abrasion and cutting while remaining flexible at low temperatures. The material formulation yields an oil-resistant design, so the cable tolerates continuous exposure to hydraulic fluids and cutting oils common in machine tools. Certified drag-chain suitability further assures that the conductor insulation and jacket can move without corkscrewing or sheath separation during high-speed cycles. Finally, its halogen-free construction reduces smoke toxicity in the event of fire, aligning the product with safety requirements for enclosed manufacturing cells.