Nidec MP550A4 / MP550A4R（550A） high-power DC thyristor drive

Conformance

Humidity 95% maximum (non condensing) at 40°C (104°F)

Ambient temperature -15°C to +40°C (5°F to +104°F), 55°C (131°F) with derating

Altitude: 0 to 3000m (9.900ft), derate 1% per 100m between 1000m (3.300ft) and 3000m (9.900ft)

Vibration: Tested in accordance with IEC 60068-2-64

Mechanical shock tested in accordance with IEC 60068-2-29

Storage temperature -40°C to +70°C (-40°F to +158°F)

Electromagnetic immunity complies with EN 61800-3 and EN 61000-6-2

Notch Immunity to IEC60146-1-1 class A

IEC 61800-5-1 Electrical safety

IEC 61131-2 I/O

EN 60529 Ingress protection

UL508C

EN 61000-6-4 EMC – with optional EMC filters

RoHS compliant

​

Nidec MP550A4 / MP550A4R is a high-performance, high-power DC thyristor drive (part of the Mentor MP series) designed for industrial motor control. It is renowned for its reliability and advanced digital control capabilities.

1. Introduction

The Nidec Control Techniques Mentor MP series represents the pinnacle of DC drive technology.

The MP550A4 (non-regenerative) and MP550A4R (regenerative) are designed to provide precise control for large DC motors.

By leveraging the control platform from Nidec’s Unidrive M series, these drives offer modern networking and integration features for legacy and new DC systems alike.

2. Technical Parameter Table

Parameter    Specification (MP550A4 / MP550A4R)

3. Product Advantages and Features

Regenerative Capability: The MP550A4R model allows for 4-quadrant operation, meaning it can return energy to the power supply during braking, increasing efficiency.

High Intelligence: Features an onboard PLC and three “SI” slots for additional motion control, I/O, or fieldbus communications.

Retrofit Friendly: Designed to easily replace older Mentor II drives with similar footprints and logic.

Robust Field Control: Built-in field controller for motor flux weakening and enhanced torque control.

Protection: Integrated protection against overcurrent, overvoltage, phase loss, and motor overheating.

4. Application Cases

Metal Processing: Controlling rollers and tensioners in steel or aluminum mills.

Lifts and Hoists: Precise speed and torque control for heavy-duty cranes and elevators.

Extruders: Providing the high constant torque required for plastics and rubber manufacturing.

Paper and Pulp: Synchronized sectional control for large-scale paper machines.

Test Rigs: High-dynamic response for automotive component testing.

5. Related Models & Same Series

The Mentor MP series spans from 25A to 7400A. Common models in the same frame size include:

MP420A4(R): 420A Output

MP700A4(R): 700A Output

MP825A4(R): 825A Output

FXMP25: External field controller for applications requiring up to 25A field current.

6. Installation and Maintenance

Installation

Environment: Ensure the drive is installed in a clean, dry environment with an ambient temperature between 0°C and 50°C.

Clearance: Maintain at least 100mm of clearance at the top and bottom for cooling airflow.

Wiring: Use high-speed semiconductor fuses to protect the thyristors.

Maintenance

Cooling Fans: Regularly check that cooling fans are free of dust and functioning.

Connections: Periodically inspect and retighten power terminal connections to prevent heat damage from arcing.

Diagnostics: Utilize the “Smartcard” or “SD Card” feature to back up parameters for fast recovery in case of hardware failure.