Product Description:

The RKL4540 is a motor power cable manufactured by Bosch Rexroth Indramat for the RKL Motor Power Cables series. It links servo drives to moving motors in automated machinery while carrying phase power and auxiliary control signals through one cable assembly. The cable is intended for continuously moving equipment such as gantries, pick-and-place axes, and automatic tool changers. Its flexible construction supports routing through energy chains where the cable must withstand repeated bending without interrupting motor operation.

The cable uses a conductor layout of [4x16.0 mm² + 2x(2x1.5 mm²)StC]C. Four large copper conductors carry motor phase current, while the smaller shielded pairs provide connections for brake circuits, encoder references, or other auxiliary signals. The outer sheath has a diameter of 25.5 mm, which must be considered when selecting cable carriers, clamps, and entry glands. When installed with the required bend radius, the cable supports up to 5 million flex cycles in dynamic applications. Its matte, adhesion-free PUR jacket resists abrasion, mineral oils, and coolant splashes while reducing the tendency of adjacent cables to stick together inside tightly packed carriers.

Line-to-shield capacitance is limited to 1.2 nF/m, helping control reactive current when the connected drive operates at higher pulse-width modulation carrier frequencies. The cable has a loop resistance of 1.21 Ω/km, which limits resistive losses and voltage drop across extended cable runs. The shielded control pairs provide low-impedance paths for auxiliary circuits and help separate sensitive signals from the larger phase conductors. In fixed installations, the allowable conductor temperature reaches 90 °C. During continuous movement, the allowable conductor temperature is 80 °C because repeated flexing contributes additional heat and mechanical stress. Proper carrier spacing and bend control help prevent excessive strain on the conductors and jacket during repetitive machine cycles.