Mitsubishi MR-H Series Servo Drives: MR-H100ACN

Technical Dossier

Product Details And Specifications

Mitsubishi Electric MR-H Series: Comprehensive Module Range and Technical Overview

The Mitsubishi Electric MR-H series represents a generation of analog-command AC servo drives engineered for precision motion control in heavy industrial environments. Deployed extensively across petrochemical refineries, nuclear power auxiliary systems, automotive stamping lines, and continuous-process chemical plants, the MR-H platform established Mitsubishi's servo architecture as a benchmark for torque linearity and encoder feedback reliability in the 1990s–2000s industrial automation era. Installations of MR-H drives remain operational in legacy machinery worldwide, creating sustained demand for verified replacement units and long-term maintenance stock.

The Evolution of MR-H Series Architecture

The MR-H series was introduced as a successor to Mitsubishi's earlier MR-S and MR-SA analog servo families, incorporating a dedicated ASIC-based current control loop and a 17-bit incremental encoder interface. The drive communicates via analog ±10 V velocity/torque command inputs and supports pulse-train position commands, making it compatible with a broad range of CNC controllers and general-purpose PLCs of its era, including Mitsubishi's own MELSEC Q and A-series motion controllers.

The architecture uses a three-phase IGBT inverter bridge with integrated regenerative braking resistor terminals. Key compatibility constraints include: the MR-H series requires a dedicated HC/HA-series servo motor with matched encoder cable (MR-ENCBL series); it does not support the later MR-J2S or MR-J3 SSCNET fiber-optic bus protocol. Facilities migrating from MR-H to modern platforms must account for encoder signal conversion and parameter re-mapping when substituting MR-J4 or MR-J5 drives.

The series lifecycle is classified as mature/end-of-life. Mitsubishi Electric has discontinued active production of MR-H drives. The recommended modern migration path is the MR-J4 series (SSCNET III/H) or MR-J5 series (EtherCAT). For facilities unable to execute a full retrofit, DriveKNMS provides long-term maintenance inventory and tested replacement units to extend operational life.

MR-H Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the Mitsubishi MR-H series. Units are classified by output capacity and command interface type.

MR-H10ACN: 100W analog AC servo amplifier, ±10V velocity command, single-phase 200VAC input.
MR-H20ACN: 200W analog AC servo amplifier, pulse/analog dual command, single-phase 200VAC.
MR-H40ACN: 400W AC servo amplifier, three-phase 200VAC, built-in regenerative resistor.
MR-H60ACN: 600W AC servo amplifier, three-phase 200VAC, dynamic brake integrated.
MR-H100ACN: 1kW AC servo amplifier, three-phase 200VAC, analog/pulse command, 17-bit encoder support.
MR-H200ACN: 2kW AC servo amplifier, three-phase 200VAC, high-inertia load compensation.
MR-H350ACN: 3.5kW AC servo amplifier, three-phase 200VAC, extended regenerative capacity.
MR-H500ACN: 5kW AC servo amplifier, three-phase 200VAC, heavy-duty industrial frame.
MR-H700ACN: 7kW AC servo amplifier, three-phase 200VAC, large-frame IGBT module.
MR-H10ACN-S084: 100W special-spec variant, modified I/O connector layout for OEM integration.
MR-H40ACN-S084: 400W OEM-spec variant, customized parameter defaults.
MR-H100ACN-S084: 1kW OEM-spec variant, factory-preset gain tuning for specific motor pairing.
MR-H200ACN-S084: 2kW OEM-spec variant, modified regenerative threshold settings.
MR-H10AN: 100W earlier sub-variant, single-phase input, predecessor to ACN suffix models.
MR-H20AN: 200W earlier sub-variant, analog command only, no pulse-train input.
MR-H40AN: 400W earlier sub-variant, three-phase 200VAC, no built-in dynamic brake.
MR-H100AN: 1kW earlier sub-variant, analog velocity command, predecessor to MR-H100ACN.
MR-H200AN: 2kW earlier sub-variant, three-phase 200VAC, analog torque/velocity modes.

Sourcing Hard-to-Find & Obsolete MR-H Series Parts

With the MR-H series in end-of-life status, authorized distribution channels no longer carry new stock. DriveKNMS maintains a dedicated inventory of tested MR-H units sourced from decommissioned machinery, factory overstock, and controlled-environment storage. Each unit undergoes functional verification before listing. For facilities operating legacy CNC machines, transfer lines, or process equipment built around MR-H drives, DriveKNMS provides a direct replacement sourcing service with lead times typically shorter than full drive retrofit projects. Inquiries for bulk quantities, specific sub-variants (S084 OEM specs), or matched motor-drive sets are handled directly by our technical sales team.

Quality Control for the MR-H Series Range

MR-H series drives incorporate a multi-layer PCB backplane with surface-mount power components and a dedicated encoder signal processing board. DriveKNMS applies the following test protocol to all MR-H units prior to dispatch:

1. Power-on self-test: Verify display initialization and absence of fault codes (AL.10–AL.99 range).
2. IGBT gate drive verification: Oscilloscope check of PWM switching waveforms at rated carrier frequency.
3. Encoder interface test: Signal integrity check on A/B/Z differential encoder lines using a reference encoder simulator.
4. Analog command response: Velocity loop response test at ±10V command input, confirming gain linearity.
5. Regenerative circuit check: Resistor continuity and IGBT regenerative path switching verification.
6. Thermal cycling: 30-minute load cycle at rated current to confirm thermal management integrity.
7. Parameter retention test: EEPROM read/write cycle to confirm parameter memory integrity after power cycle.