Product Description:

The DM 4K 7101-D servo drive module is produced by Bosch Rexroth Indramat within the DM Servo Drives series. As a three-phase module, it converts incoming AC power to a regulated DC link and supplies controlled current to synchronous motors in automated machinery. The unit also exchanges motion commands and diagnostic data over a dedicated CAN bus, allowing inclusion in distributed control architectures found in packaging lines, pick-and-place gantries, and other precision motion stations.

In the power stage, the drive maintains a regulated DC link of 670 VDC; this constant voltage is the energy reservoir that the inverter draws on for motor acceleration. When mains conditions rise, the bus can climb to a non-regulated ceiling of 715 VDC without damage. Transistors are pulsed at a factory switching frequency of 8 kHz, a rate selected to minimize motor ripple current while containing switching losses. Those losses peak at 96.5 W, so cabinet ventilation must remove that heat from the enclosure. Control electronics require a separate 24 V supply, and the module draws 0.89 A, which simplifies sizing of the auxiliary power supply. Cooling relies on forced air moving across internal heat sinks, so no external liquid circuits are required.

Compact mechanics keep the housing narrow and limit overall mass to 6.0 kg, easing installation on dense backplanes. The frame width of 50 mm aligns with standard rack slots so multiple axes can be mounted side by side. Motion processing is executed by the VeCon control chip, which handles current loops, position interpolation, and safety monitoring. Fieldbus traffic uses the CANrho protocol, while setpoints enter through a dedicated CAN interface and position feedback arrives via the STG or MTG encoder ports. Internal converters digitize feedback at 20-bit resolution, while motion setpoints are processed at 32-bit resolution to preserve fine command granularity.