Product Description:

The VM50/B-TC-1 amplifier drive is produced by Bosch Rexroth Indramat as part of the VM Amplifier Drives series. It occupies the DC power section inside modular drive racks, where it rectifies and smooths the incoming three-phase supply to create a controlled bus for downstream servo modules. By acting as a shared energy source, the device helps coordinated axes maintain constant torque, regenerate excess power, and meet cycle time requirements in automated assembly and material-handling machines.

The main electrical values describe how the amplifier interacts with the network and the connected drives. It accepts an input of 3 × 400 VAC, then rectifies that supply to a nominal bus of 520 VDC. Auxiliary electronics and control circuits are powered separately from a 24 VDC supply, allowing diagnostic logic to remain active when the main line is isolated. The module can deliver up to 50 A of continuous DC current to the bus, supporting multiple high-power axes without voltage sag. An undervoltage threshold of 400 V on the DC link triggers an automatic trip so that regenerative braking or mains dips cannot force the connected inverters into uncontrolled operation.

Thermal monitoring and interface functions add protective support for the power section. A heatsink sensor initiates a shutdown when the aluminum base reaches 100 °C, preventing semiconductor overstress during heavy duty cycles or obstructed airflow. Because the front panel provides no optical indicators, system status is forwarded externally; a BTB relay contact changes state whenever the internal logic signals ready, warning, or fault, allowing the PLC to react without visual inspection. Wiring for cabinet shielding terminates on a dedicated Faston connector, providing a quick slide-on point that maintains low impedance to ground and minimizes conducted noise entering the DC bus.