RKL4740 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat RKL4740 is part of the RKL Motor Power Cables series and features a cable jacket made from PUR with an outer diameter of 25.5 mm. It supports up to 5,000,000 bending cycles and has a conductor resistance of 1.21 Ohm per kilometer at 20°C. The cable includes 4 control conductors with a cross-section of 1.5 mm² and power wires with a cross-section of 16.0 mm².
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Product Description:
The RKL4740 is a motor power cable produced by Bosch Rexroth Indramat within the RKL Motor Power Cables series. Designed to link Indramat servo drives to synchronous motors, the cable carries three-phase power and auxiliary control signals in a single routed harness. This arrangement supports dynamic machine tools, packaging lines, and other industrial automation stations where continuous cable movement accompanies linear or rotary actuators. Combining the power and control conductors in one assembly also reduces the number of separate cables required along a moving axis.
The cable tolerates 5,000,000 flexing cycles in a drag-chain environment, allowing it to follow moving machine components without premature fatigue. For fixed routing, the minimum bend radius is 5 × D. During continuous movement, the minimum bend radius increases to 7.5 × D to limit stress on the internal conductors. The cable has an overall diameter of 25.5 mm, which accommodates standard clamp inserts and cabinet seals. Its durable PUR outer jacket resists coolants and cutting oils while retaining flexibility at low temperatures. The jacket’s smooth surface also helps reduce the accumulation of particles along automated tracks and supports movement through cable carriers.
The electrical assembly uses bulk cable type INK0606. Its power conductors have a three-core layout with a cross-sectional area of 16.0 mm², supporting high continuous current while limiting voltage drop. The cable includes four separate control conductors for functions such as temperature monitoring or brake-release signals. Each control conductor has a cross-sectional area of 1.5 mm², balancing electrical performance with manageable cable weight and flexibility. At 20 °C, the copper loop has a resistance of 1.21 Ω/km, allowing line losses to be considered when selecting cable length and drive capacity. The separate conductor groups allow the cable to carry motor power and auxiliary signals while maintaining an organized connection between the drive and motor.
