Chint NJR2-37D ซอฟต์สตาร์ทเตอร์

The Chint NJR2-37D is a bypass-type soft starter belonging to the Chint NJR2-D series. It is specially designed for 37kW three-phase squirrel-cage asynchronous motors and is commonly used in electrical drive equipment in metallurgy, mining, water supply and other fields. Below is a summary of its core information:

1. Core Electrical Parameters

2. Core Functions

Multiple Start-Stop Modes: Supports 6 starting modes including voltage ramp start, current limit start, and kick start + current limit start, as well as 2 stopping modes. It can adapt to the start-stop requirements of different load scenarios, with flexibly programmable soft start and soft stop times.

Comprehensive Protection Mechanism: Built-in multiple protection functions such as overload protection, input/output phase loss protection, load short-circuit protection, start current limit timeout protection, overvoltage protection and undervoltage protection. It can respond to faults in a timely manner and cut off the circuit to avoid damage to motors and equipment. It also has fault code display and memory functions for easy troubleshooting.

Expansion & Control: Requires an external bypass contactor for operation; optional RS485 communication module is available to support networked control and automated management; equipped with a 24V power interface and analog current output (0-20มิลลิแอมป์) for connection to relevant control circuits and monitoring equipment.

3. ราคาตลาด

– Discounts are available for bulk overseas purchases. ตัวอย่างเช่น, the unit price is 365 USD when the minimum order quantity is 5 units.

The service life of a soft starter has no fixed value, mainly depending on the operating environment, load conditions, maintenance level and aging rate of core components. The typical service life reference for industrial-grade soft starters such as the Chint NJR2-37D is as follows:

1. Servic Life Under Ideal Conditions

Under ideal conditions including stable load (no frequent heavy-load start-stops), ambient temperature of -10℃ to 40℃, no dust or oil contamination, and minimal grid voltage fluctuations, the average service life of the soft starter can reach 8–12 years.

In such conditions, the aging rate of core components (thyristors, control boards, cooling fans) is slow with a low failure rate, making it suitable for light-load, low start-stop frequency scenarios such as fans and water pumps.

2. Service Life Under Harsh Conditions

If the soft starter operates for a long time in high-temperature environments (>40℃), high-dust or high-humidity environments, or under conditions such as frequent heavy-load start-stops (more than 10 times per day), large grid voltage fluctuations, and three-phase current imbalance, its service life will be significantly shortened, usually 3–5 years.

Such working conditions will accelerate the conduction loss of thyristors, the wear of cooling fans, and the aging of electronic components on the control board, and may even cause local short-circuit faults.

3. Impact of Core Components on Service Life

Thyristors: As the core power components of the soft starter, their service life is directly related to the number of conduction cycles and current peaks. Frequent overloads will cause thyristors to overheat and breakdown, which is a key factor affecting the overall service life of the equipment.

Cooling Fans: For forced air-cooled models (เช่น, NJR2-37D), the mechanical service life of the fan is about 20,000–30,000 hours. If the fan is not replaced in a timely manner after damage, the thyristors will be burned due to poor heat dissipation.

Control Boards: In dry environments free from electromagnetic interference, the service life of electronic components can exceed 10 ปี; if eroded by dust and moisture, poor contact or short circuits are prone to occur.

4. Key Measures to Extend Service Life

– Regularly clean dust inside the equipment to keep the heat dissipation channels unobstructed.

– Avoid frequent heavy-load start-stops and set reasonable start time and current limit values.

– Install voltage stabilizers to reduce the impact of grid fluctuations on components.

– Regularly check the operating status of fans and replace damaged parts with ones of the same specifications in a timely manner.

Comprehensive Protection Mechanism: Built-in multiple protection functions such as overload protection, input/output phase loss protection, load short-circuit protection, start current limit timeout protection, overvoltage protection and undervoltage protection. It can respond to faults in a timely manner and cut off the circuit to avoid damage to motors and equipment. It also has fault code display and memory functions for easy troubleshooting.