Bosch Rexroth HNL01.1E-0200-N0125-A-480-NNNN AC Line Choke – IndraDrive Series

Bosch Rexroth HNL01.1E-0200-N0125-A-480-NNNN: AC Line Choke in Multi-Axis IndraDrive Power Architecture

The HNL01.1E-0200-N0125-A-480-NNNN is a passive AC line choke module rated at 200 A continuous current and 480 V AC (3-phase), carrying a nominal inductance of 125 µH (N0125 class). Within an IndraDrive multi-axis servo system, this component occupies the critical interface between the facility mains and the DC bus supply module — typically an HMV01 or HMV02 regenerative supply unit. Its primary function is to limit the rate of current rise (di/dt) during capacitor pre-charge transients, attenuate harmonic currents injected back into the supply network, and reduce conducted electromagnetic interference propagating upstream of the drive cabinet.

In practical terms, the choke acts as a series impedance in the AC feed path. When the IndraDrive supply module switches its input rectifier bridge, the resulting current pulses are shaped by the choke’s inductance, spreading the charge interval and reducing peak demand on the upstream transformer and switchgear. At 200 A and 125 µH, the voltage drop across the choke at rated current and 60 Hz is approximately 9.4 V per phase — within the tolerance band of standard 480 V distribution systems and well below the derating threshold for IndraDrive supply modules.

The NNNN cooling suffix indicates natural convection — no forced-air fan is integrated. This is a deliberate design choice for high-reliability cabinet environments where fan failure represents an unacceptable maintenance risk. The thermal mass of the laminated silicon-steel core and copper windings provides sufficient heat dissipation at rated load without active cooling, provided the installation respects Rexroth’s minimum clearance requirements (≥ 80 mm above and below the module).

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Technical Parameters

Hardware Logical Analysis

The HNL01.1E-0200-N0125-A-480-NNNN is constructed around a three-phase toroidal or E-I laminated core wound with heavy-gauge copper conductors. The N0125 inductance class represents a balanced engineering trade-off: sufficient series impedance to reduce total harmonic distortion (THDi) to ≤ 40% at full rated load, while keeping the fundamental-frequency voltage drop below 2% of nominal supply voltage — a threshold that avoids triggering under-voltage protection in the IndraDrive HMV supply module.

EMC Design: The winding geometry is optimized to minimize inter-winding capacitance, which would otherwise create a high-frequency bypass path that defeats the choke’s attenuation function above 150 kHz. The core material is grain-oriented silicon steel with a saturation flux density of approximately 1.8 T, ensuring the choke does not saturate under the asymmetric current waveforms typical of six-pulse rectifier loads. Saturation would collapse inductance and negate harmonic filtering entirely.

Inrush and Transient Handling: During initial power-on, the IndraDrive DC bus capacitors present a near-short-circuit load. The 125 µH inductance limits the peak inrush current to a value determined by the supply impedance plus choke impedance, protecting both the upstream fusing and the rectifier diodes within the HMV supply module. Rexroth’s sizing methodology accounts for this in the HNL01.1E selection tables (R911309636), where the 200 A / N0125 combination is validated for HMV supply modules up to 120 kW at 480 V.

Thermal Architecture: The NNNN (natural convection) variant relies on the thermal conductivity of the copper windings and the surface area of the core assembly to dissipate I²R losses. At 200 A rated current, copper losses in the winding are the dominant heat source. The core is varnish-impregnated to prevent moisture ingress and to improve thermal coupling between winding layers and the core body. Operating temperature range is −25 °C to +40 °C ambient (cabinet interior), with a thermal class of F (155 °C maximum winding temperature).

Mechanical Integration: The module uses standardized bus bar connection points dimensioned to mate directly with Rexroth IndraDrive HMV supply module input terminals, eliminating the need for custom cable assemblies. Torque specifications for bus bar bolts are defined in R911297895 and must be followed to avoid contact resistance heating at high current.

System Integration Benefits

• Harmonic current reduction: Limits THDi to ≤ 40% at full load, reducing transformer heating and protecting power factor correction banks installed elsewhere on the same distribution bus.
• Inrush current control: Shapes the capacitor pre-charge current profile, extending the service life of input contactors, fuses, and rectifier diodes in the HMV supply module.
• Conducted EMI attenuation: Series inductance attenuates high-frequency switching noise (150 kHz–30 MHz band) propagating from the drive DC bus back to the mains, supporting EN 61800-3 Category C2/C3 compliance without additional external EMC filters.
• Fan-free reliability: Natural convection cooling eliminates the single most common mechanical failure mode in drive cabinets — fan bearing wear — improving mean time between failures (MTBF) for the overall power section.
• Zero parameterization overhead: Fully passive component; no firmware, no commissioning parameters, no fieldbus address. Installation is limited to mechanical mounting and torque-tightened bus bar connections.
• Deterministic impedance: Fixed 125 µH inductance provides a predictable, stable series impedance across the operating temperature range, ensuring consistent harmonic attenuation performance over the system lifecycle without drift.
• Broad drive compatibility: Validated for use with IndraDrive HMV01, HMV02, HMS01, HMS02, and HMD01 supply and inverter modules, covering single-axis and multi-axis topologies up to 120 kW at 480 V.
• Diagnostic transparency: While passive, the choke’s thermal behavior serves as an indirect diagnostic indicator — abnormal surface temperature (measurable via IR thermometer during maintenance) signals sustained overcurrent or harmonic loading beyond design parameters, enabling proactive intervention before drive faults occur.
• Reduced upstream infrastructure stress: By limiting harmonic injection, the choke reduces neutral conductor loading in 4-wire distribution systems and decreases the risk of nuisance tripping on residual current devices (RCDs) sensitive to high-frequency leakage currents.
• Standards-compliant installation path: Inclusion of the HNL01.1E in the drive system BOM is a documented prerequisite for CE marking under the Machinery Directive and Low Voltage Directive in many IndraDrive system configurations, simplifying the compliance documentation process for OEM machine builders.

Quality Assurance & Global Logistics

Each HNL01.1E-0200-N0125-A-480-NNNN unit supplied by siemensplc.com is sourced as genuine Bosch Rexroth OEM production. The Rexroth part label, date code, and serial number remain intact on every unit, providing full traceability back to the manufacturing batch. Prior to dispatch, each module undergoes functional verification including insulation resistance measurement (≥ 100 MΩ at 500 V DC between windings and core) and inductance spot-check against the N0125 specification.

Packaging follows anti-static and moisture-protection protocols: each unit is wrapped in anti-static foam, sealed in a moisture barrier bag with desiccant, and placed in a double-wall corrugated outer carton fitted with shock-indicator labels. This packaging standard is maintained regardless of shipment destination.

Logistics operations are based in Xiamen, China — a major export hub with direct access to international freight forwarders and express courier networks (DHL, FedEx, UPS, TNT). In-stock units ship within 1–3 business days of order confirmation. Export documentation — commercial invoice, packing list, certificate of origin, and HS code declaration (8504.50) — is prepared for every international shipment to facilitate smooth customs clearance in the destination country. Air freight, sea freight, and express courier options are available depending on urgency and order volume.

A 12-month warranty against manufacturing defects is provided on all units. Warranty claims are handled directly; defective units are replaced or credited without requiring return to the original manufacturer’s service network, minimizing downtime for the end customer.

Contact Information

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