Product Description:

The RD51.1-5B-011-L-V1-FW is manufactured by Bosch Rexroth Indramat for the RD 500 Drive Controllers series. Installed in cabinet-mounted inverter racks, the unit converts fixed grid power into variable output that regulates induction motor speed on conveyors, pumps, and other continuous-duty axes. Within an automation cell, it links to a PLC through standard control terminals and applies scalar voltage-to-frequency modulation to maintain torque while limiting mechanical stress during acceleration and braking. This operating method is suited to general-purpose process equipment that needs repeatable speed adjustment without full servo control.

Its three-phase input path uses a three-phase AC supply, so the device connects directly to plant mains without an intermediate transformer. The allowable line span centers on 500 V, which suits industrial power systems while tolerating brief overvoltage events. Temperature rise is moderated by forced-air cooling, as an internal fan moves ambient air across the heat sink to remove switching losses from the IGBT bridge. Motor flux is managed through U/f curve control, a scalar method that keeps the voltage-to-frequency ratio constant so magnetizing current remains stable. The front panel includes clearly marked terminals and diagnostic LEDs for easier setup and status checks.

Dynamic stopping energy is absorbed by a built-in brake chopper, which eliminates the need for an external resistor module in most low-inertia loads. The drive is Design generation 1 and works with first-generation RD 500 power sections and option cards. An auxiliary connector provides external 24 V standby power, allowing the control logic to remain active during main disconnects for parameter retention and communication. Because the logic can stay energized, status information remains available when the main power section is switched off. The required firmware is ordered separately so the control board can be matched to the target application.