Nidec Control Techniques MP25A5 / MP25A5R (25A)

Nidec Control Techniques MP25A5 / MP25A5R (25A)

The Nidec MP25A5 and its regenerative counterpart, the MP25A5R, are precision-engineered DC drives designed for high-voltage industrial applications requiring a continuous current of 25A.

While the “A4” models are standard for 480V systems, the A5 designation indicates a higher voltage rating, specifically optimized for 575V AC supply environments (common in Canada and specific US heavy industrial sectors).

Technical Parameter Table

​Product Advantages and Features

High Voltage Resilience: Specifically rated for 575V, eliminating the need for step-down transformers in high-voltage grids.

Regenerative Efficiency: The MP25A5R version supports 4-quadrant operation, allowing energy to be returned to the line during braking—ideal for frequent start-stop cycles.

Compact Intelligence: Despite being the smallest frame size (1A), it contains the same “brain” as the larger 1850A units, including an onboard PLC and three option module slots.

Galvanic Isolation: High-grade isolation between power and control circuits ensures that noise from the 575V line does not interfere with logic or communications.

Flexible Feedback: Supports almost any feedback device, including standard tacho-generators, incremental encoders, and high-resolution SinCos encoders.

Application Cases

Small Industrial Hoists: Providing smooth, regenerative descent control in 575V environments.

Machine Tool Spindles: Precise speed regulation for small-to-medium lathes and milling machines.

Pumping Systems: Reliable speed control for chemical dosing or hydraulic power units.

Conveyor Sync: Used in multi-drive conveyor lines where small DC motors need to be perfectly synchronized via CTNet or Ethernet.

Unique Product Description: The “Precise Powerhouse”

The MP25A5 is the “Precise Powerhouse.” It is unique because it brings the high-end features of a massive industrial drive—like programmable logic and fieldbus networking—to a very small current rating.

It is specifically designed for those who refuse to compromise on control quality just because the motor is small.

Installation and Maintenance

Grounding: Ensure the grounding bracket provided is installed correctly; 575V systems are more prone to EMI (Electromagnetic Interference) than lower voltage systems.

Cooling: Even at 25A, the unit requires adequate airflow. Ensure the top and bottom vents are not obstructed by cable trunking.

SmartCard: Use the included SmartCard to back up parameters immediately after commissioning. This allows for a “plug-and-play” replacement if the drive is damaged.

Terminal Torque: Periodically check that power terminals are tight, as small-gauge wires in 25A units can be susceptible to vibration loosening.

Other Models in the Same Series

The 575V family scales upward for larger power requirements:

MP25A5(R): 25A (Frame 1A)

MP45A5(R): 45A (Frame 1A)

MP75A5(R): 75A (Frame 1A)

MP105A5(R): 105A (Frame 1B)

MP210A5(R): 210A (Frame 1B)

Larger Frames: The series continues up to Frame 2D for high-current 575V applications.

Related Models

FXMP25: An external field controller often used with the MP25A5 if the motor requires a field current higher than 2A or more advanced field weakening control.

SM-I/O Plus: Adds more digital and analog points if the onboard I/O (7 digital, 3 analog) is insufficient.

SM-Ethernet: Enables remote monitoring and Modbus TCP/IP communication for Industry 4.0 integration.