1、 Background

In industrial production, electric motors are widely used as core power equipment in various mechanical transmission systems, and their stable operation directly affects production efficiency, equipment safety, and operating costs. However, electric motors are susceptible to various faults such as overload, phase failure, leakage, and short circuit during start-up and operation, which can cause equipment shutdown in mild cases and motor burnout and safety accidents in severe cases, resulting in significant economic losses. Therefore, a motor protector with comprehensive protection functions, precise monitoring capabilities, and convenient operation and maintenance features has become a core requirement in the industrial field to ensure the safe operation of motors. Ankerui Electric is deeply involved in the field of electrical protection, and based on the actual needs of industrial scenarios, has developed and launched the ARD2 (II) series of motor protectors to build a full position protective barrier for motor safety.

2、 Product Overview

The ARD2 (II) series motor protector is an intelligent motor protection device independently developed by Ankerui Electric, focusing on safety monitoring and fault protection throughout the entire life cycle of motors. This protector can accurately identify various abnormal working conditions such as start-up timeout, overload, phase failure, current imbalance, underload, grounding/leakage, blockage, short circuit, external faults, etc. It can respond quickly through alarm, trip and other actions, and also has SOE fault event recording function, which facilitates on-site maintenance personnel to trace the cause of the fault. The product is equipped with RS485 remote communication interface and DC4~20mA analog output, which can seamlessly connect with PLC, PC and other control devices, build a remote monitoring network, and achieve real-time control of motor operation status. According to the display mode, it is divided into two types: digital tube (ARD2 (II)) and liquid crystal (ARD2L (II)), which are suitable for the visualization needs of different scenes.

3、 Product features and parameters

（1） Core Features

1. Comprehensive protection functionCovering the entire stage of motor starting, running, and stopping fault protection, from common faults such as overload and phase failure to special working conditions such as leakage, overvoltage, and undervoltage, it can accurately identify and respond. The protection mode can be flexibly turned on/off through parameters.

2. Accurate and reliable monitoringUsing dedicated current transformers (some specifications are self equipped), it supports wide range current measurement from 0.1 to 9999A, real-time acquisition of three-phase current, imbalance, voltage and other parameters, with high measurement accuracy, providing accurate basis for protection actions.

3. Intelligent operation and maintenance are convenientEquipped with 8 SOE fault event records, storing detailed fault types and occurrence times for quick troubleshooting; Support remote communication and analog output, achieve remote monitoring and data upload of motor operation status, and reduce on-site operation and maintenance costs.

4. Flexible and adaptable configurationProvide multiple additional function options (communication interface, leakage protection, analog output, etc.), with current specifications ranging from 0.4A to 800A, suitable for motors of different powers from 0.12kW to 440kW, meeting the diverse needs of industrial scenarios.

（2） Key parameters

4、 Application scenarios

The ARD2 (II) motor protector, with its high adaptability and comprehensive protection capabilities, is widely used in heavy industries such as coal mines, petrochemicals, smelting, power, and ships. It is also suitable for motor equipment in civil buildings, including:

• Ventilation fan and conveyor motor protection in coal mining;

• Safety monitoring of pumps and compressor motors in the petrochemical industry;

• Furnace drive and feeding motor protection in smelters;

• Stable operation guarantee of auxiliary equipment in power plants, such as water pumps and fans;

• Ship deck machinery, power system motor protection;

• Central air conditioning, water supply and drainage pump motor control in commercial buildings and residential communities.

The product supports two typical wiring modes: direct start and Y - △ start, and is suitable for motors with different current specifications ranging from 1.6A to 800A. Whether it is a small civilian motor or a large industrial motor, customized protection solutions can be provided.

5、 Summary

The ARD2 (II) series motor protector has the core advantages of "comprehensive protection, precise monitoring, and intelligent operation and maintenance". Through the fault protection function covering all working conditions, high-precision parameter acquisition capability, and flexible configuration options, it effectively solves the safety hazards in industrial motor operation, reduces equipment failure rate and operation and maintenance costs. It is compatible with multiple communication protocols and control devices, adapting to the needs of motors in different fields and with different powers, becoming an "intelligent guardian" for the safe operation of motors in industrial production. Ankerui Electric, with its profound technical accumulation and strict quality control, has made the ARD2 (II) protector outstanding in stability and reliability, providing solid guarantees for efficient production and safe operation in various industries.