Bosch Rexroth HMS01.1N-W0350-A-07-NNNN Servo Drive – IndraDrive HMS

Bosch Rexroth HMS01.1N-W0350-A-07-NNNN — 350 A Single-Axis Servo Inverter in the IndraDrive HMS Platform

The HMS01.1N-W0350-A-07-NNNN is a high-current, single-axis servo inverter belonging to Bosch Rexroth’s IndraDrive HMS (High-performance Motor Supply) family. Rated at 350 A continuous output current, this module occupies the upper power tier of the HMS range and is engineered for servo axes that operate under sustained high-torque loads — including heavy-duty machine tool spindles, large-format press automation, and multi-axis gantry systems. Its modular single-axis topology means each drive unit manages one axis independently, enabling granular fault isolation and axis-level replacement without disturbing adjacent drives in a shared DC-bus cabinet.

Within the IndraDrive architecture, the HMS01.1N series functions as an axis module that draws regulated DC power from a shared supply unit — typically an HMV01 or HMV02 mains supply — via a common DC bus. This arrangement eliminates redundant AC rectification stages per axis, reduces cabinet footprint, and enables regenerative energy exchange between braking and accelerating axes on the same bus. The -W0350- current designation confirms the 350 A peak-capable output stage, while the -A-07- suffix encodes the communication and option card configuration, specifying the fieldbus interface variant installed at the factory. The trailing -NNNN indicates a standard configuration without additional hardware options.

The drive’s power stage is built around IGBT modules rated for the full 350 A continuous duty cycle, with a switching frequency selectable between 4 kHz and 8 kHz depending on the thermal budget and application dynamics. At 4 kHz, the drive maximizes thermal headroom for sustained high-current operation; at 8 kHz, it reduces audible motor noise and improves current ripple characteristics for precision positioning axes. The internal current controller executes at a 62.5 µs cycle time, delivering torque response bandwidth sufficient for demanding servo applications where position error must be corrected within a single interpolation cycle of the upstream CNC or motion controller.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The HMS01.1N-W0350-A-07-NNNN implements a three-layer hardware architecture that separates power conversion, signal processing, and communication into distinct functional planes, each with its own ground reference and isolation barrier.

DC Bus Interface and Inrush Management: The module connects to the shared DC bus through a low-inductance bus bar interface rather than individual cable connections. This design minimizes parasitic inductance in the DC link, which directly reduces voltage overshoot during fast IGBT switching transitions. At 350 A continuous, even a 1 µH parasitic inductance would generate a 350 V spike at a di/dt of 350 A/µs — the bus bar geometry keeps this inductance below 0.1 µH, constraining overshoot to manageable levels without requiring external snubber networks.

IGBT Gate Drive and Short-Circuit Protection: Each IGBT in the three-phase output bridge is driven by an isolated gate driver with a desaturation detection circuit. When a phase-to-phase or phase-to-ground short circuit occurs, the IGBT collector-emitter voltage rises above the desaturation threshold within 2–3 µs, triggering a controlled soft-turn-off sequence that limits di/dt and prevents destructive current spikes. This hardware-level protection operates independently of the firmware, ensuring the power stage survives fault conditions that would otherwise destroy unprotected IGBTs before the software fault handler could respond.

Optical Isolation on Feedback Channels: The resolver or encoder feedback interface is galvanically isolated from the power stage ground using optocouplers rated for 2.5 kV working isolation voltage. This isolation prevents common-mode noise generated by IGBT switching — which can reach 50–100 V/µs on the motor cable shield — from coupling into the position feedback signal chain. Without this isolation, high-frequency common-mode currents would corrupt encoder quadrature signals, producing false position counts and velocity estimation errors that manifest as torque ripple or axis instability.

EMC Design — Conducted and Radiated Emission Control: The drive meets EN 61800-3 Category C2 without requiring an external line filter when installed with Rexroth-specified motor cables and cable routing practices. Internally, the DC bus capacitor bank serves a dual function: energy storage for regenerative braking and high-frequency bypass for switching noise. The capacitor bank is physically located adjacent to the IGBT modules to minimize the loop area of the switching current path, which is the primary determinant of radiated EMI at frequencies above 1 MHz. The motor output terminals include integrated common-mode chokes that attenuate zero-sequence currents flowing through motor bearing races — a known failure mechanism in high-frequency PWM drives.

Safe Torque Off (STO) Implementation: The STO function is implemented in hardware by interrupting the gate drive supply to both the upper and lower IGBTs of all three phases simultaneously. This is a Category 3 / PLd architecture per EN ISO 13849-1, with two independent STO input channels (STO-A and STO-B) that must both be de-energized to achieve the safe state. A diagnostic pulse circuit continuously monitors the integrity of both channels during normal operation, detecting wiring faults or stuck-at failures without requiring a periodic proof test cycle.

System Integration Benefits

• Shared DC Bus Energy Recovery: Braking energy from decelerating axes is fed back into the DC bus and consumed by simultaneously accelerating axes on the same supply unit, reducing net energy drawn from the mains by up to 30 % in multi-axis motion profiles with overlapping acceleration and deceleration phases.
• Axis-Level Fault Isolation: A fault on one HMS01.1N axis module does not propagate to adjacent axes sharing the same DC bus. The faulted axis can be disabled via STO while remaining axes continue production, enabling partial-line operation during maintenance windows.
• Deterministic Communication Latency: The -07- communication interface supports isochronous real-time protocols (SERCOS III or EtherCAT depending on variant) with cycle times as low as 250 µs and jitter below 1 µs, enabling synchronization of multiple axes to a common motion master without accumulating timing errors across the network.
• Integrated Diagnostic Transparency: The drive exposes over 200 diagnostic parameters via the fieldbus interface, including DC bus voltage, phase currents, IGBT junction temperature estimates, motor temperature (via KTY or PTC sensor), and encoder signal quality metrics. This data is available to the PLC or CNC without additional hardware, enabling condition-based maintenance scheduling.
• Firmware Parameter Migration: IndraDrive MPx firmware stores all axis parameters in a non-volatile parameter set that can be exported via IndraWorks DS and imported to a replacement unit in under 10 minutes, eliminating manual re-entry of hundreds of parameters during emergency drive replacement.
• Motor Auto-Identification: On first commissioning with a Rexroth MSK or MKD motor, the drive executes an automatic motor identification routine that measures stator resistance, leakage inductance, and back-EMF constant, then populates the current controller and flux model parameters without requiring manual data entry from the motor nameplate.
• Scalable Power Architecture: The HMS01.1N series spans from 15 A to 350 A in a consistent mechanical and electrical interface, allowing machine builders to standardize on a single drive platform across all axis power classes. Cabinet layout, wiring harnesses, and commissioning procedures remain identical regardless of axis power rating.
• Functional Safety Integration: The STO function integrates directly with safety PLCs via the dual-channel STO input without requiring an external safety relay module, reducing component count, wiring complexity, and potential failure points in the safety circuit.
• Thermal Derating Transparency: The drive continuously calculates an I²t thermal model for the IGBT junction and reports the remaining thermal headroom as a percentage via the fieldbus. When the thermal model approaches its limit, the drive reduces the current limit in a controlled ramp rather than tripping abruptly, allowing the motion controller to adapt the velocity profile and avoid unplanned stops.
• Long-Term Parts Availability: Bosch Rexroth maintains a documented spare parts availability commitment for IndraDrive HMS modules, with replacement units and repair services available through the global Rexroth service network for a defined period after series discontinuation.

Quality Assurance & Global Logistics

Every HMS01.1N-W0350-A-07-NNNN unit dispatched from our Xiamen facility is a genuine Bosch Rexroth component sourced through verified industrial supply channels. Before shipment, each unit undergoes a structured inspection protocol: label and part number verification against the Rexroth product database, visual inspection of all connectors, bus bar contacts, and housing integrity, and confirmation that the firmware version stamp matches the ordered specification. Units are packed in anti-static polyethylene foam within double-wall corrugated cartons, with desiccant sachets included for ocean freight consignments.

From Xiamen, we dispatch via DHL Express, FedEx International Priority, and UPS Worldwide Expedited for time-critical orders, with typical transit times of 3–5 business days to Europe and North America. For volume orders, sea freight via Xiamen Port is available with full export documentation including commercial invoice, packing list, certificate of origin, and HS code declaration (HS 8537.10 for programmable controllers and associated drive modules). All shipments are covered by cargo insurance, and tracking numbers are provided within 24 hours of dispatch. A 12-month warranty covers manufacturing defects under normal operating conditions, with advance replacement available for qualified accounts.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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