Rexroth HMS01-1N-W0350-A-07-NNNN Service-Ready Industrial Spare

Rexroth HMS01-1N-W0350-A-07-NNNN Service-Ready Industrial Spare: Spare Part Replacement and Downtime Risk Control

The Rexroth HMS01-1N-W0350-A-07-NNNN is a single-axis inverter module from Bosch Rexroth’s HMS (High-performance Motor and drive System) series, designed for demanding industrial servo and motion control applications. As a service-ready original spare part, this unit is sourced to support maintenance engineers and procurement teams managing legacy and active IndraDrive-based control architectures. Whether you are responding to an unplanned drive fault, executing a scheduled annual overhaul, or building a strategic spare parts inventory for a critical production line, the HMS01-1N-W0350-A-07-NNNN delivers the compatibility, reliability, and traceability required for professional industrial maintenance.

With a rated output power of 35 kW and designed for operation within Rexroth’s IndraDrive M platform, this inverter module interfaces directly with the HMV01.1R or HMV01.1E supply units and communicates via the SERCOS III or PROFIBUS interface depending on system configuration. Its modular design allows for rapid field replacement without requiring full cabinet rewiring, significantly reducing mean time to repair (MTTR) in high-availability production environments.

Spare Maintenance Table

Maintenance Planning for Continuous Operation

When replacing the HMS01-1N-W0350-A-07-NNNN in the field, a thorough inspection of the surrounding electrical circuit is essential to prevent repeat failures and ensure system stability. Maintenance engineers should treat this replacement as an opportunity to audit the entire drive cabinet and associated control infrastructure.

Begin with the DC bus supply unit. The HMV01.1R-W0120 or HMV01.1E-W0120 regenerative supply module feeds the DC bus shared by all HMS inverter axes. A failing or undersized supply unit can cause repeated overcurrent faults on the inverter. Verify the supply unit’s capacitor health and check for any error history stored in the IndraDrive diagnostic memory.

Next, inspect the CSB01.1N control section board, which manages the firmware and communication stack for the drive. If the HMS01-1N-W0350-A-07-NNNN is being replaced due to a communication fault rather than a power fault, the CSB01.1N or CSH01.1C control board may be the root cause and should be tested independently before commissioning the new inverter.

Check all power and signal wiring at the X5 motor power connector and the X1 feedback connector. Damaged motor cables — particularly shielding failures on high-flex cables used in robotic or gantry applications — can inject noise that triggers encoder faults and drive shutdowns. Replacing the inverter without addressing cable integrity will result in recurring faults.

For systems using SERCOS III communication, inspect the fiber optic ring topology and verify that the HCS02.1E-W0028 or adjacent axis modules are responding correctly on the ring. A broken fiber link or a failed SFP transceiver on any node can prevent the replacement HMS01-1N-W0350-A-07-NNNN from initializing properly during commissioning.

Review the 24 V DC auxiliary power supply feeding the control electronics. Rexroth IndraDrive M cabinets typically use a dedicated 24 V PSU (such as the Rexroth PST6100 or equivalent third-party industrial DIN rail supply) to power the control boards independently of the main DC bus. A marginal 24 V supply with excessive ripple is a common hidden cause of sporadic drive faults.

Inspect the braking resistor circuit if the application involves frequent deceleration cycles. The HMS01-1N-W0350-A-07-NNNN may be paired with an external braking resistor module; verify resistor continuity and thermal condition. Also check the fuse protection on the DC bus input — blown or weakened fuses can cause intermittent bus undervoltage faults that mimic inverter failure.

For multi-axis systems, review the backplane bus connector and the axis-to-axis communication links. Loose or corroded backplane connectors between the HMS inverter modules and the HMV supply unit are a known source of intermittent faults in high-vibration environments. Clean and reseat all connectors during the replacement procedure.

Finally, if the control system includes an IndraDrive HMI panel or an external PROFIBUS master such as a Siemens S7-300 or S7-400 PLC, verify that the drive parameters and axis configuration data are backed up before the replacement. The IndraWorks DS commissioning software should be used to upload the parameter set to the new HMS01-1N-W0350-A-07-NNNN and verify motion profiles before returning the axis to production.

Site Replacement Workflow

The HMS01-1N-W0350-A-07-NNNN is a direct replacement for end-of-life or fault-damaged units within the IndraDrive M family. The replacement workflow is designed to minimize downtime and maintain full system compatibility:

Step 1 — Isolation and Safety: De-energize the main AC supply and discharge the DC bus capacitors. Verify zero voltage on the DC bus using a calibrated meter before opening the cabinet. Follow LOTO (Lockout/Tagout) procedures.

Step 2 — Parameter Backup: If the existing drive is still partially functional, use IndraWorks DS to export the axis parameter set. If the drive is non-functional, retrieve the parameter backup from your maintenance management system or from the machine builder’s documentation.

Step 3 — Module Removal: Disconnect the X5 motor power connector, X1 encoder feedback connector, and the DC bus bar connections. Remove the HMS01-1N-W0350-A-07-NNNN from the backplane by releasing the module locking mechanism. Note the firmware version label on the old unit.

Step 4 — Inspection and Preparation: Inspect the backplane connector pins for damage or corrosion. Clean the mounting rail and verify that the replacement unit carries the same or compatible firmware version. If a firmware update is required, perform it using IndraWorks before installation.

Step 5 — Installation and Commissioning: Seat the new HMS01-1N-W0350-A-07-NNNN onto the backplane, reconnect all power and signal connectors, and restore the parameter set using IndraWorks DS. Perform a no-load test run to verify encoder feedback, current loop response, and communication status before resuming production.

This structured workflow reduces average replacement time to under two hours for experienced maintenance teams, minimizing production loss and ensuring that the replacement unit is fully validated before the line restarts.

Spare Parts Support FAQ

Q1: Is the HMS01-1N-W0350-A-07-NNNN still available as a new original spare part?
A: Yes. NINERMAS maintains stock of original Rexroth HMS series inverter modules including the HMS01-1N-W0350-A-07-NNNN. All units are sourced from authorized supply channels, individually tested before shipment, and covered by a 12-month warranty from the date of delivery. Long-term supply agreements are available for customers managing multi-year maintenance contracts.

Q2: How do I verify compatibility before ordering?
A: Compatibility is confirmed by matching the full part number including all suffix fields (W0350-A-07-NNNN). The W0350 designates the 35 kW power class, A indicates the cooling variant, and 07 specifies the firmware/hardware generation. Provide your existing drive’s nameplate data or IndraDrive system configuration file and our technical team will confirm compatibility before shipment.

Q3: What testing is performed before shipment?
A: Every HMS01-1N-W0350-A-07-NNNN unit undergoes functional verification including DC bus energization, control board initialization, communication interface check, and output stage insulation testing. A test report is available upon request. Units are packed in anti-static ESD-safe packaging with shock-absorbing foam to prevent transit damage.

Q4: What is the warranty coverage and what does it include?
A: All units are covered by a 12-month warranty from the date of shipment. The warranty covers manufacturing defects and functional failures under normal operating conditions. It does not cover damage caused by incorrect installation, overvoltage events, or operation outside the specified environmental parameters. NINERMAS provides technical support throughout the warranty period to assist with installation, commissioning, and fault diagnosis.