The REXROTH R911381256 HCS01.1E-W0003-A-02-A-CC-EC-PB-NN-NN-FW is a compact servo drive converter used for controlled single-axis motion in industrial automation equipment. It belongs to the Rexroth IndraDrive Cs / HCS01 compact converter platform, which is widely applied in machines requiring accurate motor control, compact cabinet layout, and dependable integration with automation controllers. This model is especially suitable for low-power servo axes where precise movement, stable communication, and correct configuration matching are more important than large output capacity.

The unit is identified by the material number R911381256 and the complete type code HCS01.1E-W0003-A-02-A-CC-EC-PB-NN-NN-FW. For purchasing, maintenance, and replacement work, both the material number and the full type code should be checked together. The base code HCS01.1E-W0003 indicates the compact HCS01 converter class, while the option sections define the control section, interface configuration, communication option, and firmware-related status. The PB field is an important identifier in this model because it indicates a PROFIBUS-related option position. This makes the unit different from similar HCS01.1E-W0003 converters using ET, NN, L3, S4, or other option endings.

Product Identification

In a machine system, the main task of the R911381256 compact converter is to regulate the power supplied to a servo motor. The drive receives control commands from the machine controller and converts them into controlled motor output. This allows the servo axis to perform accurate speed regulation, torque control, and position movement. For compact machines, the HCS01 platform provides a practical balance between installation size and motion-control performance.

This specific model is useful when the original machine requires the EC-PB-NN-NN-FW configuration. Many HCS01 compact converters look mechanically similar, but they are not always electrically or functionally interchangeable. A drive with PB in the option field should not be replaced casually by a version marked ET-NN-NN-FW or NN-NN-NN-FW. Differences in communication configuration may affect PLC connection, drive commissioning, fieldbus diagnostics, and machine startup behavior.

Technical and Practical Features

The approximate 1.39 kg net weight makes the REXROTH R911381256 compact converter convenient for spare-parts handling and international shipment. However, buyers should not confuse net weight with shipping weight. The packed gross weight may be higher after adding the carton, protective foam, anti-static bag, moisture barrier, and outer export packaging. For commercial invoices and packing lists, it is better to separate net weight and gross weight instead of using one value for both.

Application Fields

The REXROTH R911381256 HCS01.1E-W0003-A-02-A-CC-EC-PB-NN-NN-FW is not intended for heavy-duty spindle drive applications or high-power inverter replacement. Its correct role is compact servo-axis control. It is better suited for small machine functions that require repeatable movement, predictable response, and reliable electrical integration. In real production environments, this type of drive may control a positioning table, an adjustment screw, a feed roller, a small rotary indexer, or a controlled actuator mechanism.

For maintenance engineers, this model is often purchased when a machine already uses the same HCS01 configuration. Before removing the old unit, the parameter file should be backed up where possible. A drive replacement may fail if the replacement unit has incorrect firmware, missing parameters, different communication options, or incompatible safety and encoder settings. The full model code should be compared against the original nameplate line by line.

Replacement Check Table

Correct installation is also critical. Servo drives are sensitive to wiring quality, grounding, electromagnetic interference, cabinet temperature, and feedback signal integrity. Loose terminals, damaged motor cables, poor shield connection, overheated cabinets, unstable supply voltage, or incorrect parameter loading can produce faults that appear to be drive failures. For this reason, replacing the drive without checking the surrounding system is risky.

Recommended Listing Information

For online product pages, the full material number and model code should be included in the title, description, specification table, and searchable text. Buyers often search using the exact Rexroth order number, the full HCS01 type code, or shortened variants such as HCS01.1E-W0003 PB converter, R911381256 servo drive, or IndraDrive Cs compact converter. Clear indexing of these terms helps the product page appear in search results for engineers, maintenance teams, and procurement buyers looking for the exact spare part.

The REXROTH R911381256 HCS01.1E-W0003-A-02-A-CC-EC-PB-NN-NN-FW is a configuration-specific compact servo drive converter for low-power motion-control applications. Its value is not only its compact hardware platform, but also its correct match with the original machine communication and firmware requirements. When the complete model code, PB configuration, parameter set, and connected servo motor system are properly verified, this unit can serve as a reliable spare part or replacement drive for automated production machinery, packaging systems, handling equipment, and compact industrial motion-control installations.