Nidec Control Techniques MP155A5 / MP155A5R (155A)

Nidec Control Techniques MP155A5 / MP155A5R (155A)

The Nidec MP155A5 and its regenerative counterpart, the MP155A5R, are advanced digital DC drives designed for medium-to-high power applications.

 Rated at 155A and engineered specifically for 575V AC input, these drives are part of the premier Mentor MP series. 

They provide a high-performance alternative to AC drives in applications where DC motors are already installed or where high torque and regenerative capabilities are required at a lower system cost.

Technical Parameter Table

Product Advantages and Features

Galvanic Isolation: Features patent-pending technology to isolate control circuits from the high-voltage power stage, protecting connected PLC and I/O equipment—a rarity in DC drive design.

High-Speed Control: Utilizes a 32-bit microprocessor with a 35μs current sampling time and 250μs speed loop update, ensuring extremely responsive motor control.

Regenerative Braking (MP155A5R): The 4-quadrant model returns kinetic energy to the grid during deceleration, providing significant energy savings and superior control for overhauling loads.

Onboard Intelligence: Includes a built-in PLC (SyPTLite) for managing local logic and automation without the need for an external controller.

Migration Path: Specifically designed with the same mounting points as the legacy Mentor II, making it an ideal "drop-in" upgrade for aging systems.

Application Cases

Pulp and Paper Mills: Driving medium-sized rollers and tensioners where 575V grids are common.

Wire Drawing: Maintaining precise tension and speed control for consistent product quality.

Rubber Mixers: Providing high starting torque for high-viscosity materials.

Crane and Hoist Systems: Utilizing the MP155A5R for controlled descent and energy recovery in vertical lifting applications.

Unique Product Description: The "High-Voltage Bridge"

The MP155A5 serves as the "High-Voltage Bridge," uniquely designed to handle the 575V power standards of North American heavy industry without needing an isolation transformer.

 It combines "brute force" power delivery with "fine-tuned" AC-style intelligence, allowing operators to keep their high-torque DC motors while gaining modern Ethernet connectivity and precision digital control.

Installation and Maintenance

Thermal Management: The 155A unit is housed in a Frame 1B chassis. Ensure at least 100mm (4 inches) of clearance above and below the unit for airflow.

Fuse Protection: Use high-speed semiconductor fuses (aR type) to protect the internal SCRs. Standard circuit breakers are insufficient for the speed of electronic faults.

SmartCard Backup: Parameters should be backed up to the included SmartCard. This allows for near-instant drive replacement by simply transferring the card to a new unit.

Terminal Integrity: In 155A applications, cable expansion due to heat is common. Periodically check the torque of all armature and AC input terminals to prevent arcing.

Other Models in the Same Series

The Mentor MP series for 575V (A5) covers a wide industrial range:

Lower Current: MP25A5(R), MP45A5(R), MP75A5(R), MP105A5(R)

Current Model: MP155A5(R)

Higher Current: MP210A5(R) through to MP1850A5(R)