Product Description:

The DM 30K 7301-D belongs to the DM Servo Drives series from Bosch Rexroth Indramat. In an automated line, it converts a regulated DC bus into controlled three-phase output for synchronous or induction motors, while its CANrho setpoint interface links axis commands to higher-level PLCs. A resolver input supplies real-time rotor position, letting the drive close current loops and execute torque or velocity profiles without external feedback electronics.

The power stage is energized from a DC link stabilized at 670 VDC, and at that potential the drive draws an input current of 8.5 A dc. Internally, it reprocesses this energy into a three-phase output that reaches 3ph 400 V line-to-line and can supply a continuous armature current of 8.2 A. The switching elements commutate at a carrier frequency of 8 kHz, which balances spectral content with semiconductor losses. A nonregulated bus of 715 VDC precedes the chopper and can rise with regenerative energy, so the declared power loss of 156 W reflects conduction and switching heat during steady operation. The auxiliary 24 V rail requires only 1.03 A for logic, gate drive, and resolver excitation, which helps maintain control power when the main link is isolated. Resolver resolution is 12 bits, giving 4096 discrete angle values per mechanical revolution.

Short-term overload is handled by two current ceilings: up to 29 Arms when the carrier is limited to 4 kHz and 22 Arms when full 8 kHz modulation is required, allowing a tradeoff between switching frequency and thermal margin. The module occupies 50 mm of rack width and weighs 6.0 kg, so multiple axes can fit in a narrow cabinet bay without placing excessive load on the mounting rail. Heat dissipation must account for the 156 W loss level, and the regulated DC link matches the input voltage for shared bus operation across adjacent DM units.