Nidec Mentor MP155A4 / MP155A4R (155A) Industrial DC Drive

Nidec Mentor MP155A4 / MP155A4R (155A) Industrial DC Drive

The Nidec Mentor MP155A4 and MP155A4R are high-capacity, digital DC drives designed to provide robust and intelligent control for large industrial motors.

These drives are the modern successors to the industry-standard Mentor II, offering a seamless transition to current automation standards while maintaining the heavy-duty reliability required for demanding applications.

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

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

Product Introduction

The MP155A4 is a 2-quadrant (non-regenerative) drive, ideal for high-torque unidirectional tasks.

Its counterpart, the MP155A4R, is a 4-quadrant (regenerative) drive capable of full motoring and braking in both directions, making it essential for applications involving overhauling loads or rapid deceleration.

Built on the Control Techniques platform, these 155A drives combine power density with the same sophisticated software environment used in modern AC drive technology.

Technical Parameter Table

Product Advantages and Features

Intelligent Migration: Designed as a drop-in replacement for the Mentor II, retaining the same physical dimensions and power terminal locations to minimize downtime during retrofits.

Onboard PLC: Includes SyPTLite programming, allowing the drive to handle logic tasks and simple motion control without an external PLC.

Galvanic Isolation: Features a unique isolated control interface that protects low-voltage components and users from high-power spikes on the main armature circuit.

Advanced Field Control: The internal field controller manages up to 8A, supporting field weakening and flux control for optimized motor performance.

Expansion Ready: Three universal option slots support high-speed Ethernet (EtherCAT, PROFINET), additional I/O, and advanced feedback modules.

Unique Product Description

The MP155A4 series acts as the “Brain of the DC Motor.” Unlike basic controllers, it uses a 32-bit microprocessor with a 35μs current sampling rate, providing nearly instantaneous torque response.

Its “SmartCard” system allows field technicians to transfer entire drive configurations in seconds without a laptop, making it one of the most user-friendly high-power drives on the market.

Other Models in the Same Series

The Mentor MP series scales to meet any power requirement:

MP25A4(R) to MP105A4(R): Compact Frame 1A units (25A–105A).

MP210A4(R): The next step up in Frame 1B (210A).

MP350A4(R) to MP1850A4(R): Large Frame 2 series for heavy industrial mills.

Modular Systems: Capable of parallel configurations up to 7400A.

Application Cases

Metals & Mining: Used in wire drawing and small rolling mills where constant torque is critical.

Plastic & Rubber: Driving extruders and mixers that require high starting torque and precise speed regulation.

Cranes & Hoists: The MP155A4R is the gold standard for hoist control, providing safe regenerative braking and load holding.

Test Benches: Utilized in automotive dynamometers to simulate road loads through precision torque control.

Installation and Maintenance

Mounting: Ensure vertical mounting with at least 100mm of clearance above and below the unit for air intake and exhaust.

Thermal Protection: The drive features intelligent fan control that adjusts speed based on heatsink temperature, extending fan life and reducing dust buildup.

Communication: For modern smart factories, connect via the onboard Modbus RTU port or an optional Ethernet module for real-time cloud monitoring and predictive maintenance alerts.

Safety: Always verify that the armature and field fuses are high-speed semiconductor types (e.g., Cooper Bussmann) to ensure SCR protection.