KSM02.1B-041C-42N-S1-HP0-ET-L3-D7-TO-FW by Bosch Rexroth Indramat

The KSM02.1B-041C-42N-S1-HP0-ET-L3-D7-TO-FW is a motor-integrated servo drive produced by Bosch Rexroth Indramat for the KSM Motor Integrated Servo Drives series. By combining a servomotor, power stage, and control electronics in one housing, it streamlines decentralized motion axes on automated assembly lines, conveyors, and packaging machines. The integrated design eliminates the need for a cabinet-mounted inverter and uses distributed DC bus power to execute position and speed commands close to the load.

Power enters the device through a hybrid connector that carries both the DC supply and field I/O, minimizing cabling. The drive section operates from a 750 V DC link, so it can connect directly to a high-energy common bus without an internal rectifier. Heat is removed by natural convection, and the absence of cooling fans reduces maintenance in particulate environments. Network traffic and real-time control reach the integrated controller through a Multi-Ethernet interface that supports EtherNet/IP, PROFINET, EtherCAT, and Sercos III. Dedicated terminals accept commands for Safe Torque Off (STO). This function disables the gate drive so the motor cannot generate torque while the machine is in a safe state.

Rotor feedback is provided by a Hiperface optical encoder with 128 signal periods per revolution, enabling single-turn absolute position reporting to the drive. The mechanical envelope follows motor size 041 with length code C, providing a compact stack that accommodates the continuous current associated with winding code 42. Output torque is transferred through a shaft with a keyway. A shaft seal limits contaminant ingress around the bearing, while the absence of a holding brake reduces rotational inertia. The unit is design version 1 and series 2, with a Basic performance level. Its multi-Ethernet output coupling supports communication with several common industrial networks without requiring separate network interfaces.