The REXROTH R911338759 HCS01.1E-W0003-A-02-B-ET-EC-EM-NN-NN-FW is a compact single-axis servo drive converter for industrial automation systems that require precise motor control, stable cabinet integration, and accurate configuration matching. It belongs to the Rexroth HCS01 compact converter platform, commonly used in IndraDrive-based motion-control systems for low-power servo axes.

This product is identified by the material number R911338759 and the full type code HCS01.1E-W0003-A-02-B-ET-EC-EM-NN-NN-FW. For purchasing, replacement, and technical checking, the complete type code should be used together with the material number. The shortened base code HCS01.1E-W0003 only describes the general converter class. It does not fully identify the communication structure, interface options, firmware condition, or machine-specific configuration.

The key configuration point of this model is the ending B-ET-EC-EM-NN-NN-FW. This is different from nearby HCS01.1E-W0003 versions using B-ET-EC-CN-L3-NN-FW, B-ET-EC-CN-L3-RP-FW, B-ET-EC-EC-L3-NN-FW, or A-CC-EC-PB-NN-NN-FW. The EM option field should be treated as configuration-relevant. It should not be replaced by CN, EC, PB, RP, or NN without checking the original machine configuration.

Product Identification

The main function of the R911338759 compact converter is to regulate the electrical output supplied to a connected servo motor. In an automation system, the drive receives control commands from the machine controller and converts them into controlled motor behavior. This allows the servo axis to perform repeatable speed control, position movement, torque-related action, and dynamic start-stop cycles.

Unlike a standard variable frequency drive used for ordinary AC motor speed regulation, this unit is intended for servo motion systems. It must be matched with the correct motor, feedback device, communication structure, firmware, parameter set, and machine program. Incorrect matching can lead to commissioning failure, communication faults, encoder errors, axis alarms, or unexpected machine behavior.

Type Code Interpretation

The EM field is the most important distinction for this model. Many HCS01 compact converters share the same power class and similar external housing, but option fields can create major differences during replacement. A drive ending in EM-NN-NN-FW should not be treated as interchangeable with a drive ending in CN-L3-NN-FW, EC-L3-NN-FW, or PB-NN-NN-FW unless the machine builder or drive specialist confirms compatibility.

For spare-parts supply, the safest selection rule is to match the exact material number R911338759 and the complete model code HCS01.1E-W0003-A-02-B-ET-EC-EM-NN-NN-FW. If the old unit is still installed, a clear nameplate photo should be used for verification before ordering.

Main Product Features

The compact design is useful in automation cabinets where space is limited. Modern machine cabinets often contain PLCs, distributed I/O terminals, power supplies, contactors, relays, safety devices, communication modules, and several servo drives. A compact HCS01 converter helps reduce installation density while still supporting accurate closed-loop motion control for one machine axis.

The approximate 1.39 kg net weight is suitable for product listing, spare-parts inventory, and preliminary export documentation. However, this value should be treated as net product weight, not final shipping weight. Gross weight may be higher after adding anti-static packaging, foam, carton, moisture protection, and outer export packing. For packing lists, it is better to use the measured packed weight if available.

Typical Application Areas

In packaging machinery, this type of compact servo converter may control a film feed roller, a label positioning axis, a cutter adjustment mechanism, or a small indexing unit. In assembly systems, it can support accurate actuator positioning, fixture movement, or small rotary table control. In electronics production, it may be used for inspection movement, alignment tasks, or light-duty positioning stages.

The drive is best used in applications where precision, repeatability, and stable integration are required. It is not the right choice for large spindle motors, high-power pump drives, fan drives, or general-purpose asynchronous motor control. Its proper role is compact servo-axis control within an industrial machine.

Replacement and Installation Checklist

Correct replacement work should include more than matching the current rating. A fault in a servo axis may be caused by the drive, but it may also come from the motor, encoder cable, motor power cable, brake wiring, grounding, input power quality, cabinet overheating, or parameter mismatch. Replacing the drive without checking these surrounding conditions can lead to repeated faults.

If the unit is used or refurbished, the physical inspection should include the housing, nameplate, terminal blocks, connector pins, front panel, cooling area, and signs of overheating or contamination. A tested unit is generally safer for urgent machine maintenance than an untested spare part, especially when the machine downtime cost is high.

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The REXROTH R911338759 HCS01.1E-W0003-A-02-B-ET-EC-EM-NN-NN-FW is a configuration-specific compact servo drive converter for low-power industrial motion-control axes. Its value comes from compact cabinet installation, accurate servo-axis regulation, and correct option matching. The EM field should be treated as technically significant during replacement. When the full model code, firmware condition, communication setup, 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.