Nidec Control Techniques MP105A5 / MP105A5R (105A)

Nidec Control Techniques MP105A5 / MP105A5R (105A)

The Nidec MP105A5 and its regenerative counterpart, the MP105A5R, are high-performance DC thyristor drives designed to bridge the gap between compact small-frame units and massive mill-duty bridges.

Rated at 105A and specifically engineered for 575V AC supplies, these drives are the go-to solution for medium-power industrial applications in regions like North America (especially Canada) where 575V grids are standard.

Technical Parameter Table

Product Advantages and Features

Optimized for 575V: Eliminates the inefficiency and cost of using step-down transformers by running natively on high-voltage industrial lines.

Regenerative Braking (MP105A5R): The 4-quadrant model provides full control of overhauling loads, feeding energy back into the mains rather than wasting it as heat in resistors.

Frame 1B Efficiency: Offers a larger internal cooling capacity than Frame 1A units while maintaining a compact vertical footprint, making it ideal for multi-drive cabinet lineups.

Unmatched Safety: Includes an integrated Safe Torque Off (STO) input, allowing the drive to be part of a high-integrity safety circuit (SIL3) without extra contactors.

Sophisticated Field Control: The internal 8A controller supports field weakening, allowing for a wider constant-power speed range on legacy DC motors.

Application Cases

Pulp and Paper: Sectional drives for mid-sized rollers and tensioning systems where 575V supply is common.

Medium Extruders: Providing the constant torque required for high-quality plastic or rubber profile extrusion.

Industrial Mixers: Handling high-viscosity fluids where the drive must provide high starting torque at low RPM.

Hoists and Cranes: The MP105A5R is specifically used for vertical movement, ensuring smooth braking and energy recovery during load lowering.

Unique Product Description: The “Balanced Veteran”

The MP105A5 is known as the “Balanced Veteran.” It sits at the sweet spot of the Mentor MP range—providing enough power to drive significant industrial machinery while remaining small enough to be easily handled by a single technician.

It is uniquely reliable for “brownfield” projects where 40-year-old DC motors need modern, high-precision control to meet today’s production tolerances.

Installation and Maintenance

Cabinet Airflow: Frame 1B units generate more heat than smaller models. Ensure at least 100mm of vertical clearance and verify that the cabinet exhaust fans can handle the total heat dissipation (measured in Watts).

Terminal Care: At 105A, electrical resistance at the terminals can lead to significant heating. Use appropriately sized lugs and verify torque settings during every scheduled maintenance interval.

Environmental Protection: If installed in a dusty environment (like a sawmill), use filters on the enclosure. The MP105A5 uses high-speed fans that can draw in contaminants.

Software Backup: Utilize the SmartCard for “parameter cloning.” In the event of a failure, a new drive can be commissioned in under 60 seconds by simply inserting the card.

Other Models in the Same Series

The 575V (A5) series offers a smooth progression of power to fit any motor size:

Frame 1A (Compact): MP25A5(R), MP45A5(R), MP75A5(R)

Frame 1B (Mid-Range): MP105A5(R), MP155A5(R), MP210A5(R)

Frame 2 (High Power): MP350A5(R) through MP1850A5(R)