The REXROTH R911339126 HCS01.1E-W0003-A-02-B-ET-EC-EC-L3-NN-FW is a compact single-axis servo drive converter for industrial automation systems that require precise motion control, compact cabinet integration, and configuration-specific replacement accuracy. It belongs to the Rexroth HCS01 compact converter platform, which is used in IndraDrive-based motion-control systems for low-power servo axes.

This model is identified by the material number R911339126 and the complete type code HCS01.1E-W0003-A-02-B-ET-EC-EC-L3-NN-FW. For purchasing, replacement, or technical confirmation, the full type code should be used instead of only the shortened base model. Many HCS01.1E-W0003 units share a similar physical structure, but their option fields may differ in communication, encoder interface, safety function, firmware requirement, and machine compatibility.

The key difference of this version is the configuration ending B-ET-EC-EC-L3-NN-FW. Compared with nearby variants using CN-L3-NN-FW, CN-L3-RP-FW, or PB-NN-NN-FW, this model has an additional EC option position after the first EC field. That second EC should be treated as a configuration-relevant item. It should not be replaced by CN, PB, NN, or RP without checking the original machine configuration.

Product Overview

The main function of the R911339126 compact converter is to regulate motor power for a connected servo axis. In a complete automation system, the drive receives control commands from the machine controller, processes feedback from the motor or encoder system, and delivers controlled output for accurate movement. This allows the machine axis to perform precise positioning, controlled speed changes, torque-related movement, and repeatable motion cycles.

This product is not a general-purpose frequency inverter for ordinary AC motor speed control. It is a servo drive converter intended for controlled motion systems. It should be matched with the correct servo motor, feedback configuration, communication interface, firmware, parameter set, and machine safety arrangement. Incorrect matching may cause startup faults, communication errors, encoder alarms, safety messages, or failed commissioning.

Type Code Interpretation

The second EC field is the most important point to verify for this model. It is easy to confuse this unit with other compact converters that have similar front labels and the same HCS01.1E-W0003 power class. However, HCS01 compact converters are option-dependent products. A unit with B-ET-EC-EC-L3-NN-FW may not behave the same as a unit with B-ET-EC-CN-L3-NN-FW or B-ET-EC-CN-L3-RP-FW. For this reason, replacement should be based on the complete type code and material number.

Main Product Features

The compact size of the HCS01 platform is useful in machines where cabinet space is limited. Modern automation cabinets often contain multiple power supplies, PLCs, terminal blocks, relays, safety modules, communication devices, and several drive converters. A small servo drive converter helps reduce layout pressure while still supporting accurate motor control for one machine axis.

The approximate 1.39 kg net weight is suitable for product pages, internal spare-parts lists, and commercial descriptions. For shipping documents, this should be treated as a net product weight rather than a final gross weight. The gross weight may be higher after adding anti-static protection, foam, carton packaging, moisture protection, and outer export packing. If no actual packed measurement is available, the shipment weight should be confirmed before preparing a final packing list.

Typical Application Areas

In packaging equipment, this type of compact converter may control a small feed roller, a cutting mechanism, a label positioning axis, or a sealing adjustment unit. In assembly automation, it can be used for fixture positioning, controlled actuator movement, or indexing mechanisms. In electronics production, it may support alignment tables, inspection stages, or light-duty positioning axes. These applications usually require repeatability, smooth motion, and reliable machine integration rather than high output power.

Replacement and Procurement Checklist

Correct replacement requires more than matching the current rating. A drive fault may also be caused by an external motor problem, damaged encoder cable, poor shielding, weak grounding, unstable supply voltage, brake circuit fault, cabinet overheating, or parameter mismatch. Before replacing the drive, the surrounding system should be checked to avoid repeated failures after installation.

For used or refurbished units, the inspection process should include the housing, nameplate, terminal condition, connector pins, front panel, internal fan area, and signs of overheating or contamination. If the drive is supplied as a replacement part, functional testing and parameter compatibility checks are recommended before final installation.

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The REXROTH R911339126 HCS01.1E-W0003-A-02-B-ET-EC-EC-L3-NN-FW is a configuration-specific compact servo drive converter for low-power industrial motion-control axes. Its value comes from compact installation, accurate servo-axis control, and exact option matching. The B-ET-EC-EC-L3-NN-FW configuration should be treated as technically significant, especially during replacement work. When the full model code, firmware, safety configuration, parameter set, and connected servo motor system are correctly verified, this unit can serve as a reliable spare converter for packaging machinery, assembly equipment, inspection systems, material-handling devices, and other automated production machines.