Nidec Control Techniques MP75A5 / MP75A5R (75A)

Nidec Control Techniques MP75A5 / MP75A5R (75A)

The Nidec MP75A5 and its regenerative version, the MP75A5R, are high-performance DC thyristor drives designed for mid-range power applications.

Operating at 75A, these units are specifically engineered for 575V AC supply environments.

As part of the Mentor MP family, they offer a sophisticated migration path for legacy DC systems, providing modern digital control, enhanced safety features, and high-voltage tolerance in a compact Frame 1A chassis.

Models available for two or four quadrant (regenerative) operation

25A to 7400A, 24V – 480V / 500V – 575V / 500V – 690V

Optional high-brightness LED or multi-language LCD keypad, simple configuration using plain text

Modular parallel connection for higher power motor operation

12/24 pulse operation to minimize harmonics

IP20 (NEMA 1) protection for size 1. IP10 (open chassis) for size 2A and 2B, and IP00 (open chassis) for size 2C and 2D for easy, low cost installation

Integrated drive and motor protection for:

Over current

Over temperature

Phase loss

SCR/Thyristor junction temperature

Feedback loss

MP75A5

Field loss

Armature open circuit

Internal field controller with intelligent field weakening means that for 90% of applications no additional external controller is required

Frame size 1 to 8A

Frame size 2 to 20A

Flux control for enhanced open loop performance

Technical Parameter Table

Product Advantages and Features

Native 575V Support: Built specifically for regions or industries utilizing 575V grids (such as Canadian industrial sites or US textile and timber mills), eliminating the cost of bulky transformers.

Integrated Field Control: Features an internal 8A field controller, which is sufficient for most 75A motor frames, simplifying the wiring and reducing panel space.

High-Speed Processing: Utilizing the same control core as the Unidrive SP AC series, it provides ultra-fast current loop cycles for superior motor responsiveness.

Energy Recovery: The MP75A5R allows for full 4-quadrant control, capturing energy from braking loads and returning it to the line, which lowers the total cost of ownership (TCO).

Modular Expandability: Equipped with three plug-in slots for communication (Ethernet, Profibus) and specialized feedback or I/O modules.

Application Cases

Material Handling: Driving mid-sized conveyors and sorting systems where precise speed synchronization is required.

Textile Industry: Controlling spinning frames and fabric tensioners that operate on high-voltage industrial grids.

Wood Processing: Managing feed drives for saws and planers where high starting torque and quick stops are common.

Printing Presses: Providing the smooth, low-ripple torque necessary for maintaining print quality across high-speed webs.

Unique Product Description: The “Smart Torque Link”

The MP75A5 acts as the “Smart Torque Link” within an industrial plant.

It is uniquely positioned to handle motors that are too large for small micro-drives but don’t require the massive footprint of a mill-duty bridge. It bridges the gap by offering high-voltage stability and elite-level motion control parameters usually found only in much larger, more expensive units.

Installation and Maintenance

Ventilation: Frame 1A units rely on efficient internal fans. Ensure that air intakes at the bottom and exhausts at the top are clear of dust and debris.

High-Voltage Safety: Working with 575V requires strict adherence to safety protocols. Use appropriately rated insulated tools and ensure the DC bus is fully discharged before maintenance.

Parameter Management: Use the SmartCard or CTSoft software to clone settings. This is vital for 24/7 operations where downtime for manual re-entry of parameters is unacceptable.

Field Weakening: If using the drive for high-speed operation, ensure the field weakening parameters are tuned correctly to prevent “runaway” conditions or motor damage.

Other Models in the Same Series

The 575V Mentor MP series provides a continuous power scale:

Lower Power: MP25A5(R), MP45A5(R)

Current Model: MP75A5(R)

Higher Power (Frame 1B): MP105A5(R), MP155A5(R), MP210A5(R)

High Current (Frame 2): Scaling up to 1850A for massive 575V systems.

Related Models & Accessories

FXMP25: An external field controller used if the motor field requirement exceeds 8A.

SM-Applications Plus: A high-performance automation controller for complex “Center Winder” or “Flying Shear” applications.

SM-Ethernet: For connecting the drive to factory-wide SCADA and IIoT monitoring systems.

MP-Keypad: A removable LCD keypad that provides plain-text descriptions of parameters and faults.