Product Description:

The VM 60 047888-307 is an amplifier drive module produced by Bosch Rexroth Indramat for the VM Amplifier Drives series. It sits between the facility’s mains transformer and downstream servo inverters, generating a stabilized DC bus that feeds multiple axes in an automation cell. By converting three-phase utility power into a regulated intermediate circuit, the unit supplies the stored energy needed for rapid acceleration and controlled torque production in industrial machinery. Its shared-bus arrangement allows several connected drives to draw power from one centralized source.

The module is designed for an incoming AC power source and accepts a line-to-line voltage of 380 V. Its input section operates at 50 Hz, supporting phase-synchronous rectification on compatible utility networks. Power conductors terminate on a connection marked 3/PE, indicating three phase conductors and a protective earth connection. The protective earth provides a low-resistance path for fault current and supports proper grounding of connected equipment frames. After rectification and smoothing, the drive can deliver up to 60 A of continuous current to the shared DC link. The incoming voltage, operating frequency, terminal arrangement, and current capacity provide the necessary values for selecting compatible contactors, fuses, conductors, and busbars. Adequate enclosure ventilation and spacing are also necessary to manage heat produced during sustained operation.

The module provides a DC output, preventing line-frequency variations from passing directly to the connected servo inverters. Under nominal load, the bus operates at 520 V, giving downstream inverters sufficient voltage for controlling high-speed spindles, rotary servo motors, or linear motor axes. The assembly weighs 7000 g, which must be considered when selecting a vertical panel, mounting plate, or slide-out rack. Secure mounting helps support the module’s mass and limits movement caused by machine vibration or repeated switching cycles. The regulated bus supports coordinated acceleration and deceleration across packaging, printing, and material-handling equipment without requiring a separate rectifier for each connected axis.