Product Description:

The RS51.1-4G-050-S-V1-FW is a basic drive from Bosch Rexroth Indramat that belongs to the RD 500 Drive Controllers series. As a three-phase converter, it supplies adjustable voltage and frequency to induction motors so production lines, pump groups, or material-handling stations can match motor speed to process demand while minimizing electrical stress. That operating method is useful in general industrial systems that need steady acceleration, repeatable speed changes, and reduced mechanical shock during routine starts and stops.

This drive draws power through a three-phase AC converter input and can be connected to mains anywhere in the 380 to 480 V range. Line fluctuations are tolerated within ±10 %, allowing continuous operation on plants with imperfect regulation. At a rated output of 50 kVA, the unit can support medium-sized motor loads without an external step-up transformer. Speed regulation relies on U/f curve control. By maintaining a proportional relationship between voltage and frequency, the controller keeps motor flux constant across the full speed span and limits magnetizing losses. This method is well suited to applications where broad speed adjustment matters more than the fast dynamic response expected from vector or servo systems.

A built-in brake chopper and resistor dissipates regenerative energy during rapid deceleration, so external braking hardware is unnecessary. The integrated mains filter suppresses conducted emissions, simplifying EMC compliance for cabinet builders. When control electronics must stay powered during mains isolation, the drive accepts 24 V standby power from an external supply, keeping the interface and diagnostics active. It can also keep status functions available during brief power interruptions. The unit is Design Generation 1.