Schneider Electric Lexium MHD Series Servo Drives – MHDA1056N00

Technical Dossier

Product Details And Specifications

Schneider Electric Lexium MHD Series: Comprehensive Module Range and Technical Overview

The Schneider Electric Lexium MHD series represents a mature, field-proven servo drive platform deployed across global heavy industry verticals including petrochemical refineries, nuclear power auxiliary systems, offshore platform motion control, and continuous-process chemical plants. The MHD designation covers a range of brushless AC servo motors and their paired drive electronics, engineered for deterministic torque and velocity response in closed-loop motion applications. Installed base across IEC-regulated facilities in Europe, Asia-Pacific, and the Americas makes this series one of the most widely maintained legacy servo platforms in industrial automation.

The Evolution of Lexium MHD Architecture

The Lexium MHD series originated from Schneider Electric's acquisition of Berger Lahr motion technology assets in the early 2000s, inheriting a resolver-based feedback architecture that prioritized robustness in high-vibration and high-temperature environments. Early MHD variants (MHD041, MHD071) used analog command interfaces and were paired with Lexium 05 and Lexium 15 drive controllers via proprietary SERCOS I fiber-optic rings.

Mid-generation revisions introduced EnDat 2.1 encoder compatibility and expanded the power range into the MHDA (high-inertia) and MHDE (economy) sub-families. The MHDA1056N00 specifically belongs to the high-dynamic MHDA sub-series, rated for 5.6 Nm continuous stall torque with an N00 shaft and connector configuration. These drives interface natively with Lexium 32 and Lexium 62 controllers over CANopen and EtherCAT fieldbus protocols.

By 2018, Schneider Electric transitioned primary development to the Lexium 28 and Lexium 62 platforms, placing the MHD series into a sustained-availability lifecycle phase. Spare parts and replacement units remain available through authorized distributors and specialist suppliers such as DriveKNMS, but new design-ins are directed toward the BSH and BMH motor families.

Lexium MHD Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the Schneider Electric Lexium MHD servo motor and drive ecosystem. Each entry reflects a distinct power, frame, feedback, or shaft configuration.

MHDA1056N00: High-dynamic servo motor, 5.6 Nm stall torque, size 100, N-shaft, standard connector, resolver feedback.
MHDA1028N00: High-dynamic servo motor, 2.8 Nm stall torque, size 100, N-shaft, standard connector, resolver feedback.
MHDA1028P00: High-dynamic servo motor, 2.8 Nm stall torque, size 100, P-shaft (with key), standard connector.
MHDA1056P00: High-dynamic servo motor, 5.6 Nm stall torque, size 100, P-shaft (with key), standard connector.
MHDA2052N00: High-dynamic servo motor, 5.2 Nm stall torque, size 200 frame, N-shaft, resolver feedback.
MHDA2052P00: High-dynamic servo motor, 5.2 Nm stall torque, size 200 frame, P-shaft (with key).
MHDA2083N00: High-dynamic servo motor, 8.3 Nm stall torque, size 200 frame, N-shaft, resolver feedback.
MHDA2083P00: High-dynamic servo motor, 8.3 Nm stall torque, size 200 frame, P-shaft (with key).
MHDA3155N00: High-dynamic servo motor, 15.5 Nm stall torque, size 300 frame, N-shaft, resolver feedback.
MHDA3155P00: High-dynamic servo motor, 15.5 Nm stall torque, size 300 frame, P-shaft (with key).
MHDA3205N00: High-dynamic servo motor, 20.5 Nm stall torque, size 300 frame, N-shaft, resolver feedback.
MHDE1028N00: Economy sub-series, 2.8 Nm stall torque, size 100, N-shaft, cost-optimized resolver feedback.
MHDE1056N00: Economy sub-series, 5.6 Nm stall torque, size 100, N-shaft, cost-optimized resolver feedback.
MHD041A-144-PG0-UN: Compact frame 041, 1.44 Nm, analog interface, Lexium 05/15 compatible, resolver.
MHD071B-060-PG0-UN: Frame 071, 6.0 Nm, analog/SERCOS I interface, Lexium 05/15 compatible, resolver.
MHD071B-035-PG1-UN: Frame 071, 3.5 Nm, SERCOS I, incremental encoder option, Lexium 15 compatible.
MHD090B-058-PG0-UN: Frame 090, 5.8 Nm, SERCOS I/CANopen, resolver, Lexium 32 compatible.

Sourcing Hard-to-Find & Obsolete Lexium MHD Parts

The Lexium MHD series entered a reduced-availability phase following Schneider Electric's platform consolidation toward BSH and BMH motor families. OEM production of certain MHD sub-variants has ceased, making aftermarket sourcing the primary procurement channel for maintenance and emergency replacement scenarios.

DriveKNMS maintains a dedicated inventory program for Lexium MHD series components, covering both current sustained-availability SKUs and confirmed-obsolete part numbers. Sourcing capabilities include new-old-stock (NOS) units from decommissioned OEM production runs, tested-serviceable units recovered from controlled plant shutdowns, and cross-referenced replacement identification where a newer BSH or BMH motor can be mechanically and electrically substituted.

Quality Control for the Lexium MHD Range

Servo motors and drives in the MHD series present specific test challenges due to their resolver-based feedback architecture and integrated thermal protection circuits (PTC thermistors embedded in stator windings). DriveKNMS applies a structured test protocol to all MHD units prior to dispatch:

Resolver excitation and signal integrity verification is performed using a dedicated resolver analyzer to confirm R1/R2 winding resistance within OEM tolerance (typically ±5%) and SIN/COS output amplitude balance. Insulation resistance testing (Megger, 500 VDC) is applied between phase windings and motor frame to confirm no moisture ingress or winding degradation. Back-EMF waveform analysis at controlled spin speed validates magnet integrity and confirms no demagnetization from prior thermal events. PTC thermistor continuity and resistance-temperature curve verification confirms thermal protection circuit operability. For MHDA sub-series units with integrated holding brakes, brake coil resistance and mechanical release force are measured against OEM specifications. Final functional run-in is conducted on a matched Lexium 32 or Lexium 62 test bench under closed-loop velocity control, logging torque ripple, speed regulation, and encoder/resolver feedback consistency across the operating speed range.