RKL4318 by Bosch Rexroth Indramat

The RKL4318 motor power cable is produced by Bosch Rexroth Indramat as part of the RKL Motor Power Cables series. It serves as a fixed or flexing link between Rexroth servo drives and field-mounted motors. It carries three-phase power along with auxiliary control cores required for brake or sensor circuits in automated machinery.

Its flex-rated design withstands 5,000,000 bending cycles in cable-track service, a figure aimed at high-duty indexing tables and gantry axes that operate around the clock. A minimum bend radius of 7.5 x D / 5 x D for dynamic and static use keeps conductor stress within limits during repetitive motion, where D equals the external diameter. The sheath diameter is 18.5 mm, yet the construction houses eight conductors: three power cores at 6.0 mm² for motor phases and five auxiliaries sized at 1.0 mm² on pins 5 and 6 and 1.5 mm² on pins 7 and 8. These auxiliaries run at a control potential of 300/300 V, while the power trio is insulated for 300/500 V service. A PUR jacket resists oil splashes and welding sparks, and the cable's discharge capacity is held to 0.8 nF/m so inverter pulse edges remain clean.

Bulk designation INK0604 identifies the wire arrangement, shielding braid, and drain design that stabilize impedance across long runs. That layout contributes to a loop resistance of 3.30 ?/km, limiting voltage drop when drives are several meters from the motor cabinet. The cable terminates on the controller end with the circular plug RLS0723/K06 and locks to the motor housing through the keyed RLS1201/C06, helping prevent incorrect connection. Low capacitance, combined with the segregated 1.0 mm² and 1.5 mm² control pairs, suppresses common-mode noise and keeps brake or sensor signals within tolerance even when the assembly is routed beside high-energy busbars inside a machine tool.