Bosch Rexroth HMD01.1N-W0036-A-07-NNNN Servo Drive – Obsolete DIAX04 Spare Part

Technical Dossier

Product Details And Specifications

Bosch Rexroth HMD01.1N-W0036-A-07-NNNN Servo Drive – Obsolete DIAX04 Spare Part

When a double-axis servo drive fails on a DIAX04-era production line, the consequences are not measured in hours of downtime — they are measured in the cost of a full control system migration. A single HMD01.1N-W0036-A-07-NNNN module sits at the center of coordinated multi-axis motion control. Its failure does not pause one axis; it halts the entire synchronized sequence. Engineering assessments for a full retrofit on a legacy Rexroth DIAX04 platform routinely exceed six figures before a single new component is installed. DriveKNMS maintains verified stock of this discontinued drive specifically to protect manufacturers from that scenario.

Technical Specifications

Note: Parameters listed are based on published Rexroth DIAX04 series documentation. Any parameters not confirmed by documentation are intentionally omitted. Verify all specifications against your original system drawings before installation.

Solving the Discontinued Hardware Crisis

The Bosch Rexroth DIAX04 platform — including the HMD01.1N series double-axis drives — was the backbone of high-precision servo motion control throughout the 1990s and 2000s. It is deeply embedded in automotive body-in-white lines, precision grinding machines, semiconductor handling equipment, and packaging automation built during that era. Bosch Rexroth has since migrated its drive portfolio to the IndraDrive platform, and DIAX04 components are no longer manufactured or supported through standard distribution channels.

The HMD01.1N-W0036-A-07-NNNN is not a peripheral component. It is the motion controller for two coordinated servo axes simultaneously. In a synchronized multi-axis cell, removing this module from service means the entire cell goes dark. There is no partial workaround. The SERCOS II fiber optic communication ring that connects these drives to the controller requires exact firmware compatibility — a replacement drive must carry the correct firmware slot identifier (07 in this case) to re-enter the ring without reconfiguration.

For plant managers facing end-of-life pressure on DIAX04 systems, the calculus is straightforward: a verified spare drive purchased today costs a fraction of the engineering labor, new hardware, and production loss associated with a forced migration. Facilities that maintain a one- or two-unit buffer of critical DIAX04 drives have documented asset life extensions of 5 to 10 years beyond the platform's official end-of-support date — without a single line of new PLC code written.

The strategy is not complicated. It requires identifying the three to five drive models that, if lost, would trigger a mandatory system replacement. The HMD01.1N-W0036-A-07-NNNN is almost always on that list for DIAX04 installations. Securing verified stock of those specific models converts an uncontrolled failure risk into a managed maintenance event.

Condition & Reliability Assurance

Discontinued drives sourced from the secondary market carry real risk if they are not properly evaluated before installation. DriveKNMS applies a structured 5-step inspection protocol to every HMD01.1N-W0036-A-07-NNNN unit before it is offered for sale:

• Electrolytic Capacitor Assessment: DC bus and filter capacitors are inspected for bulging, electrolyte leakage, and ESR degradation. Capacitors showing measurable aging are flagged — units are not reconditioned and resold as new without disclosure.
• Firmware Version Verification: The firmware module slot is confirmed against the part number suffix (slot 07). Firmware identity is cross-checked to ensure compatibility with SERCOS II ring initialization sequences.
• Terminal and Pin Corrosion Inspection: All connector pins, power terminals, and fiber optic ports are inspected under magnification for oxidation, fretting corrosion, and mechanical damage.
• Power Stage Functional Check: Where test equipment permits, the drive's power stage is energized under controlled conditions to verify gate driver response and current feedback integrity.
• Cosmetic and Mechanical Integrity: Housing, mounting rails, and fan assembly are inspected. Units with structural damage that could affect thermal management or panel mounting are not offered for sale.

Condition grade and any findings are disclosed in writing prior to order confirmation. We do not use the word new for units that cannot be verified as factory-sealed.

Key Features for System Maintenance

• Drop-in replacement: The HMD01.1N-W0036-A-07-NNNN installs directly into the existing DIAX04 drive cabinet without mechanical modification.
• No reprogramming required: Provided the firmware slot (07) matches the outgoing unit, the SERCOS II controller recognizes the replacement drive on ring initialization without parameter re-entry.
• Avoids engineering reconstruction costs: A forced migration from DIAX04 to IndraDrive or a competing platform requires new drive cabinets, new motor cables, new controller hardware, and full recommissioning. A verified spare eliminates that cost path entirely for the duration of the asset's remaining service life.
• Protects production schedules: Unplanned downtime on a synchronized servo cell carries costs that dwarf the price of a spare drive. Having a verified unit on the shelf converts a potential multi-week outage into a same-shift swap.

FAQ

What warranty applies to a discontinued drive?
DriveKNMS provides a 90-day functional warranty on all tested units. The warranty covers failure under normal operating conditions and excludes damage caused by incorrect installation, overvoltage events, or use outside the drive's rated parameters.

How do I confirm the unit is genuine and not counterfeit?
All units are inspected for Bosch Rexroth labeling authenticity, serial number format consistency, and internal construction against known-good reference units. We provide the serial number and condition report before shipment.

Should I buy more than one unit?
For any DIAX04 installation with more than one HMD01.1N-W0036-A-07-NNNN in service, maintaining at least one spare per installed unit is the standard recommendation for facilities that cannot tolerate extended downtime. Secondary market availability of this specific model is declining. Units available today may not be available in 12 months.

Can this drive be used with IndraDrive controllers?
No. The HMD01.1N-W0036-A-07-NNNN is a DIAX04-generation drive and is not compatible with IndraDrive Cs, Cc, or Mi series controllers. It operates exclusively within the DIAX04 SERCOS II architecture.