Product Description:

The RS51.1-4G-014-L-NN-FW is a drive controller module manufactured by Bosch Rexroth Indramat as part of the RD 500 Drive Controllers series. In an automation cell it supplies regulated power to motor inverters, governs ramp profiles, and absorbs regenerated energy when loads decelerate. Integrating this controller simplifies panel layouts because the braking circuit, chopper stage, and thermal supervision are already contained in the same 33 kg housing, allowing machine builders to focus on application-level logic rather than discrete power handling.

The braking path is dimensioned for continuous dissipation of 0.6 kW; during a one-second emergency stop it tolerates a peak of 11.4 kW. A resistor value of 30 Ω is fitted, matching the internal chopper that can redirect up to 11.2 kW into heat while keeping the DC-bus voltage within limits. To ensure the chopper fires only into a safe load, its control logic blocks operation if resistance drops below 27 Ω. Under cyclic duty (S6) the controller can deliver 11 kVA to the inverters, drawing 23 A from the supply and 19 A under continuous (S1) loading; for 60 seconds it can rise to 18 kVA and 29 A, giving machines headroom for acceleration spikes. Environmental class 3K3 allows installation in production areas with moderate temperature and non-condensing humidity.

Thermal management relies on 0.1 m³/s of forced airflow across finned heat sinks, and the open-frame design carries an IP20 rating, so it must be mounted inside a switchgear cabinet. With a short-time output capability of 11 kVA the unit complements mid-size milling spindles, extruders, or pallet conveyors that need quick speed changes. The 27 Ω minimum braking resistance is identical to the chopper limit, so system designers can extend dynamic braking by adding parallel banks while respecting that floor. Peak current of 29 A is sensed electronically and will trigger controlled shutdown if exceeded, preserving semiconductors and maintaining line uptime.