Rexroth HMS01.1N-W0020-A-07-NNNN Retrofit Single-Axis Servo Drive

Rexroth HMS01.1N-W0020-A-07-NNNN Retrofit Single-Axis Servo Drive: Legacy-Compatible Upgrade for IndraDrive M Systems

The Rexroth HMS01.1N-W0020-A-07-NNNN is a single-axis servo inverter module from the Bosch Rexroth IndraDrive M platform, rated at 2.0 kW continuous output power. Designed for demanding industrial motion control environments, this drive module is widely deployed in legacy automation lines, CNC machining centers, packaging machinery, and multi-axis servo systems where precise torque and velocity control are critical. As the HMS01 series approaches end-of-production status in many regional markets, the HMS01.1N-W0020-A-07-NNNN has become a key retrofit and replacement component for engineers tasked with extending the operational life of existing IndraDrive M installations without full platform migration.

This unit is fully compatible with the IndraDrive M modular rack architecture, accepting standard HMV supply modules and sharing the common DC bus with adjacent HMS01 or HMD01 axis modules. The -A-07- firmware designation supports standard motion function packages including positioning, velocity, and torque control modes, making it a direct functional replacement for worn or failed units in existing multi-axis configurations. The -NNNN option code confirms no additional hardware options, simplifying spare parts sourcing and cross-referencing against legacy bills of materials.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

Replacing a failed or end-of-life HMS01.1N-W0020-A-07-NNNN in an active production line requires a structured approach to avoid configuration loss and extended downtime. Before removing the faulty module, engineers should use IndraWorks Ds or IndraWorks D to perform a full parameter backup of the axis, capturing all drive parameters, motor data sets, and application-specific tuning values. This backup file is essential for restoring the replacement unit to the exact operating state of the original drive.

On the hardware side, the HMS01.1N-W0020-A-07-NNNN connects to the IndraDrive M rack via the DC bus bar and the module connector. Before installation, verify that the HMV01.1E or HMV02.1E supply module powering the rack has sufficient capacity to support the 2.0 kW axis alongside any co-installed HMS01 or HMD01 modules. Overloading the supply module is a common oversight during piecemeal axis replacement and can cause nuisance trips or supply module faults after commissioning.

Terminal wiring for the motor power output (U, V, W) and the motor feedback cable must be reconnected to the replacement module using the original cable routing. For systems using MSK servo motors or MKD synchronous motors with resolver feedback, confirm that the resolver cable shield is grounded at the drive end only, following Rexroth EMC wiring guidelines. Systems using EnDat 2.1 or Hiperface encoders should verify that the feedback supply voltage and cable length remain within specification after any cabinet rework.

Communication integration is a critical checkpoint. In SERCOS II topologies, the HMS01.1N-W0020-A-07-NNNN must be re-addressed within the SERCOS ring after installation. The drive address is typically set via rotary switches on the module front panel and must match the address previously assigned in the CNC or PLC project — whether that controller is a Rexroth IndraMotion MLC, a Siemens SINUMERIK, or a third-party motion controller. After address assignment, the SERCOS phase startup sequence must complete successfully before the axis becomes operational. In systems where the HMS01 communicates via analog ±10 V velocity reference or parallel I/O rather than SERCOS, verify that the command signal wiring and enable logic are correctly reconnected to the new module’s terminal strip.

For multi-axis cabinets where the HMS01.1N-W0020-A-07-NNNN operates alongside HCS01 compact drives, HMD01 double-axis modules, or NFD filter modules, confirm that the DC bus fusing and bus bar connections are intact and torqued to specification after module removal and reinstallation. Loose bus bar connections are a leading cause of intermittent DC bus faults in retrofitted IndraDrive M systems. Additionally, if the cabinet includes an HNF01 mains filter or HNL01 mains choke, verify that these components remain correctly rated for the total drive load after any axis changes.

HMI integration should also be validated during commissioning. If the machine uses a Rexroth IndraControl VCP or a third-party operator panel connected via Ethernet or serial link to the motion controller, confirm that axis-specific diagnostic screens and parameter display pages reference the correct drive address after replacement. In some legacy installations, HMI screen configurations hard-code drive node addresses, requiring a brief HMI project update if the replacement module is assigned a different address during commissioning.

Downtime Control During System Migration

Minimizing production downtime during an HMS01.1N-W0020-A-07-NNNN replacement depends on preparation quality. The single most effective measure is completing the parameter backup and firmware version check before the maintenance window begins. If the replacement unit arrives with a different firmware sub-version than the original, a firmware update via IndraWorks Ds should be performed on the bench prior to installation, eliminating the need for online firmware loading during the maintenance window.

A pre-staged replacement module — powered up on a test bench with the backed-up parameter set loaded and verified — can reduce in-cabinet commissioning time to under 30 minutes for a straightforward axis swap. This approach is particularly valuable in high-throughput manufacturing environments where each hour of downtime carries significant production cost.

To protect original program logic, the PLC or CNC project file should be archived before any hardware changes. In IndraMotion MLC systems, the IEC 61131-3 motion program and axis configuration are stored in the controller, not the drive, so the program itself is not at risk during a drive swap. However, drive-resident parameters — including motor data, control loop tuning, and application-specific limit settings — are stored in the HMS01 module and must be restored from backup. Failing to restore these parameters is the most common cause of post-replacement commissioning delays.

For systems where a cold spare HMS01.1N-W0020-A-07-NNNN is maintained in the facility’s spare parts inventory, the replacement cycle can be further compressed by pre-loading the parameter backup onto the spare unit during a scheduled maintenance interval, so that the unit is ready for immediate installation if the installed drive fails unexpectedly. This practice is strongly recommended for critical axes in continuous-process or 24/7 production environments.

Every unit supplied is pre-shipment tested under load conditions to verify output stage integrity, feedback interface function, and communication readiness before dispatch. This pre-shipment testing protocol reduces the risk of receiving a non-functional replacement and is backed by a 12-month warranty covering manufacturing defects and functional failures under normal operating conditions.

Retrofit Support FAQ

Q: Is the HMS01.1N-W0020-A-07-NNNN a direct replacement for earlier HMS01.1N-W0020 firmware variants?
A: In most cases, yes. The HMS01.1N-W0020-A-07-NNNN is functionally compatible with earlier -A-04- and -A-05- firmware variants in the same power class. However, a parameter backup from the original unit and a parameter restore to the replacement unit are always required to ensure identical operating behavior. Firmware version differences may require a brief IndraWorks Ds update session before commissioning.

Q: What wiring checks are required before powering up the replacement drive?
A: Verify motor power terminal connections (U, V, W, PE), motor feedback cable polarity and shield grounding, DC bus bar torque, enable and safety relay wiring, and SERCOS fiber connections or analog command signal wiring as applicable. Confirm that the supply module (HMV01 or HMV02) is not overloaded with the replacement axis included in the total load calculation.

Q: How is the drive address assigned after installation in a SERCOS system?
A: The SERCOS drive address is set using the rotary address switches on the HMS01 module front panel. Set the address to match the original drive’s node address as configured in the motion controller project. After powering up, initiate the SERCOS phase startup from the controller and confirm that the axis appears correctly in the drive topology before enabling motion.

Q: What does the 12-month warranty cover, and is pre-shipment testing included?
A: The 12-month warranty covers manufacturing defects and functional failures under normal industrial operating conditions from the date of shipment. Every HMS01.1N-W0020-A-07-NNNN unit undergoes pre-shipment functional testing — including output stage verification, feedback interface check, and communication readiness confirmation — before dispatch. Units that do not pass testing are not shipped. Warranty claims are supported by our technical team at sale@ninermas.com.