Bosch Rexroth HCS02.1E-W0028-A-03-NNNN

Description

Bosch Rexroth HCS02.1E-W0028-A-03-NNNN

 

Product Introduction

The HCS02.1E-W0028-A-03-NNNN is a Bosch Rexroth IndraDrive C compact converter intended for single-axis industrial motion applications in the middle power range. With a 28.3 A maximum device current and 12 A continuous current, it sits above the smaller W0012 HCS02 unit while retaining the compact cabinet-oriented architecture of the HCS02 family. Bosch Rexroth documentation identifies R911298374 as the exact material number for this configuration.

This is not simply a standalone “28 A servo amplifier” with every control function permanently built in. The HCS02 architecture uses a control-unit interface and can be configured for different automation, encoder, safety, and I/O requirements through the associated control section. That distinction matters during replacement: the power section may match electrically while the installed control hardware, firmware, encoder configuration, and machine parameters do not.

For procurement, retain the complete HCS02.1E-W0028-A-03-NNNN designation. Bosch’s own GoTo documentation lists R911298374 specifically for this type code, which is stronger identification than relying on a shortened -W0028 description.

Key Technical Specifications

• Manufacturer: Bosch Rexroth
• Product Family: IndraDrive C
• Exact Type Code: .1E-W0028-A-03-NNNN
• Material Number: R911298374
• Device Type: single-axis compact converter
• Maximum Device Current: 28.3 A
• Continuous Current: 12 A
• Power Supply, 3-Phase: 200–500 VAC
• Power Supply, 1-Phase: 200–250 VAC
• Nominal Mains Frequency: 50–60 Hz
• Output: 3-phase AC, dependent on mains connection voltage
• Continuous Power Without Choke: Approximately 5.1 kW
• Maximum Power Without Choke: Approximately 8 kW
• Maximum Power With Power Choke: Approximately 10 kW
• Maximum Output Frequency at 4 kHz Switching: 0–400 Hz
• Maximum Output Frequency at 8 kHz Switching: 0–800 Hz
• Maximum Output Frequency at 12 kHz Switching: 0–1200 Hz
• Maximum Output Frequency at 16 kHz Switching: 0–1600 Hz
• Cooling: Internal air cooling / integrated blower
• Protection Rating: IP20
• Width: Approximately 65 mm
• Height: Approximately 251.5 mm in one published dimensional listing
• Depth: Approximately 352 mm in the same listing
• Weight: Approximately 4.3 kg unpacked

Published dimensional data varies slightly between documentation presentations, with one current material record giving a larger installation envelope. For cabinet engineering, use the original Bosch Rexroth mechanical drawing rather than relying on shipping dimensions or reseller measurements.

 

Global Sourcing & Live-Test SOP

1. Inbound Verification

For an incoming .1E-W0028-A-03-NNNN, begin with the nameplate rather than the seller’s title.

• Confirm Bosch Rexroth branding.
• Confirm R911298374.
• Match the complete type code character-for-character.
• Record serial number and hardware/revision information.
• Photograph all connectors and terminal blocks.
• Inspect the DC-bus and motor terminals for heat discoloration.
• Check the integrated blower for contamination, seized bearings, or abnormal axial play.
• Inspect the control-unit mounting area for damaged connectors.
• Verify that the enclosure has not been modified or drilled.

The difference between NNNN and other suffixes is not something to ignore. The published product family contains variants ending in NNNN and NNNV, among others.

2. Electrical Pre-Test

Keep the unit de-energized during the initial inspection.

Check:

• Power-terminal integrity
• Motor-output terminals
• DC-bus terminals
• Ground connection
• Control-section connector
• Fan condition
• Visible PCB contamination
• Signs of electrolytic-capacitor leakage or overheating

A Fluke multimeter or equivalent industrial meter can identify obvious shorts and abnormal resistance conditions, but a resistance check does not establish that a servo converter is operational. Do not apply arbitrary insulation-test voltages directly to sensitive electronics.

3. Control and Feedback Verification

The is designed to work with an appropriate control section and associated automation hardware. Before energizing a replacement unit, document the original control configuration and parameter set.

Verify:

• Control-unit type
• Firmware identification
• Motor model
• Encoder technology
• Encoder cable
• Feedback connector
• Communication interface
• Safety configuration
• Motor parameters
• Acceleration/deceleration limits

The project-planning documentation separates the power section from the control section, so a correct power-section part number does not automatically mean that the complete drive configuration is identical to the original machine.

4. Functional Test

A useful test sequence is:

• Energize under controlled conditions.
• Confirm drive initialization.
• Check diagnostic display/status information.
• Verify control-unit communication.
• Confirm encoder recognition.
• Verify motor phase assignment.
• Check for immediate DC-bus or power-stage faults.
• Enable torque only after the safety circuit has been verified.
• Run the motor at low speed without load.
• Monitor current and drive temperature.
• Confirm feedback direction and commanded direction.
• Review stored diagnostic/fault history.

Do not use “powers on” as the definition of a tested industrial servo drive.

5. Extended Heat Run

For a critical replacement spare, perform a controlled extended test and record:

• AC input voltage
• Motor current
• DC-bus behavior
• Drive temperature
• Blower operation
• Feedback stability
• Communication status
• Fault history

After testing, preserve the recorded firmware and parameter information with the unit and seal it in ESD-safe packaging.

 

Field Engineer’s Pitfall Guide

❗ Do not confuse NNNN with NNNV

The .1E–A-03-NNNN and .1E–NNNV are separate configurations with different material numbers. The NNNV version is listed as R911299521, while this NNNN version is R911298374. A similar-looking enclosure and identical 28 A class do not establish interchangeability.

When sourcing a replacement, photograph the complete nameplate. Do not accept “ ” as sufficient identification.

❗ 28.3 A is not the continuous application rating

The published maximum device current is 28.3 A, while the continuous current is 12 A. The difference is significant when sizing the drive for sustained machine duty. Published power values also depend on whether a power choke is used.

A machine that intermittently peaks near the device maximum can have very different thermal requirements from one operating continuously near its nominal current.

❗ The power section does not define the complete drive system

documentation describes a modular architecture with a power section and control section. The control hardware determines important interfaces and application functions, so replacing the power section without preserving the correct control configuration can turn a physically compatible spare into a commissioning problem.

This is particularly relevant to a migration strategy: preserve the existing parameters, firmware information, motor data, encoder settings, and communication configuration before removing a working drive.

 

Intent-Driven FAQ

a servo drive?

It is a Bosch Rexroth IndraDrive C compact converter used for single-axis motion applications. The architecture combines a power section with an associated control section rather than treating the power section as an isolated generic inverter.

What is the current rating?

The published maximum device current is 28.3 A, with a 12 A continuous current rating for this configuration. These numbers should not be interpreted as interchangeable motor-sizing values.

What motor power does this unit support?

The family covers approximately 1.5–11 kW, while this configuration is associated with approximately 4 kW nominal motor power in published technical records. Final motor sizing still depends on motor current, duty cycle, speed, overload requirements, cooling, and the actual control configuration.

What inoltage doe use?

Published data specifies 200–500 VAC for three-phase input and 200–250 VAC for single-phase input, at a nominal mains frequency of 50–60 Hz. Verify the machine’s actual supply arrangement and installation requirements before energizing.

Does it have an integrated cooling fan?

Yes. The published configuration specifies internal air cooling with an integrated blower. Fan condition should be checked carefully on used or long-stored inventory because restricted airflow can produce thermal faults even when the power stage itself is healthy.

What does NNNN mean for replacement purposes?

NNNN identifies a particular configuration. It should be preserved in the purchase specification because Bosch Rexroth also produced closely related configurations with different suffixes and material numbers. For this exact unit, the material number is R911298374.

Is this drive suitable as an in-stock replacement?

It can be considered as a replacement candidate only after comparing the complete type code, material number, control section, firmware, motor/encoder combination, communication configuration, and machine parameters. For surplus or refurbished inventory, request a clear nameplate photograph and evidence of powered functional testing before treating the unit as application-ready.

 

Procurement Note

For an industrial purchase order, specify:

Bosch Re — Material98374

Do not shorten the requirement to “ 28 A.” The full suffix is part of the identification.

For in-stock, factory-sealed, surplus, or refurbished inventory, verify the physical nameplate, serial number, hardware revision, control-unit configuration, blower condition, and available firmware/parameter documentation. A visually clean is not automatically a machine-ready replacement.