Product Description:

The 1070077603-303 drive module is manufactured by Bosch Rexroth Indramat for the DM Servo Drives series. It serves as the power stage between the DC bus and the motor windings, allowing the controlled current delivery needed for accurate motion in CNC systems, packaging equipment, and assembly lines. Installed in a compact mechanical housing, the module connects to higher-level controls through a SERCOS interface, which supports fast and deterministic command exchange. This layout makes the unit suitable for cabinet-based servo systems where consistent axis response and compact installation are important.

The DC link operates at 670 VDC Reg / 715 VDC Non-Reg, giving the module the voltage headroom needed for fast motor response. Its current rating is 30 A at 2 kHz, which is the maximum sinusoidal output available when the pulse-width modulation frequency is set to 2 kHz. When the switching frequency is raised to 4 kHz, the drive can supply up to 29 Arms peak and 14 Arms continuous. At 8 kHz, the available output changes to 22 Arms peak and 9.7 Arms continuous. These operating points show that higher switching frequencies reduce current capacity because of additional switching losses, even though they can improve waveform smoothness and reduce audible noise.

The control electronics draw 1.03 A from the 24 V cabinet supply, so the supporting power supply must reserve that amount for each installed drive. During operation, the inverter section dissipates up to 156 W, and that heat must be removed through the built-in air cooling path together with cabinet airflow. The unit also uses derating coefficients of 0.35 A/K at 4 kHz and 0.24 A/K at 8 kHz, which means the available output current must be reduced as ambient temperature rises. Mechanical installation is helped by the 50 mm module width and a mass of 6.0 kg, allowing dense cabinet layouts without taking excessive rail space.