Chint NJR2-300 Soft Starter

Regarding the technical parameters, market applicability, and procurement information of Chint NJR2-300 Soft Starter, the following is a comprehensive analysis based on publicly available data:

Core Technical Features
Control Capability

Voltage Range: Three-phase AC380V (±15%), supporting a frequency of 50Hz/60Hz.

Power Coverage: Suitable for squirrel-cage asynchronous motors with a power range from 7.5kW to 500kW.

Current Regulation: Supports a rated current limit of 0.5 to 5 times, and precise control can be achieved through the dual closed-loop mode.

Protection Functions

– Built-in multiple protections such as overload, input/output phase loss, short circuit, overvoltage/undervoltage, and overheating.

– Supports RS485 communication expansion (external module required), enabling remote monitoring and automatic linkage.

Structural Design

– An external bypass contactor is required, and it is suitable for use with complete control cabinets.

– Has a wide operating temperature range (-10°C to 40°C), adapting to industrial environments.

Adaptability to the North American Market
Certification and Compliance

UL Certification: Chint’s power products (such as photovoltaic inverters) have passed the UL certification, but the UL certification status of the NJR2-300 Soft Starter needs to be further confirmed. It is recommended to contact us via Chint North America customer service on WhatsApp (+86-13811255435) for verification.

Standard Compatibility: Complies with IEC 60947-4-2 and GB/T 14048.6 standards, but it is necessary to confirm whether it meets the North American NEC code.

Supplier Network

Local Channels in the United States: Chint has a branch office and a logistics center in North America, but the distributors of NJR2-300 are not directly listed. You can purchase through the following channels:

III. Key Procurement Information

Price Reference

Domestic Market Price: The price of the NJR2 series increases with the power. For example:

– NJR2-75D (75kW) is approximately WA：0086-13811255435yuan.

– NJR2-110D (110kW) is approximately WA：0086-13811255435yuan.

International Procurement Cost: Cross-border freight, tariffs, and value-added tax need to be considered, and the total cost may increase by 20% to 30%.

Delivery Time

Domestic In-stock: Platforms like show that customized models require 3 to 5 working days.

Direct Shipment from the United States: If there is inventory in Chint’s North American warehouse, the delivery time can be shortened to 1 to 2 weeks; otherwise, it needs to be shipped from China, with a cycle of about 4 to 6 weeks.

Technical Support

Manual Download: The NJR2 series instruction manual can be obtained through third-party document platforms (such as [Renrenwenku.com]), but it is recommended to apply for the official version through Chint’s official website.

After-sales Channels: Chint North America customer service provides technical consultation and supports product debugging and troubleshooting.

Alternative Solutions and Comparisons

If the NJR2-300 does not meet the requirements, the following competing products can be considered:

Schneider ATV320 Series: Supports integrated bypass and has an energy management function, with a price of approximately WA：0086-13811255435 yuan.
ABB PSE Series: Features a modular design, supports Profibus communication, and has a stable delivery time (2 to 3 weeks).
Siemens G120C Series: Suitable for high dynamic response scenarios, but the price is relatively high (approximately WA：0086-13811255435 yuan).
Procurement Suggestions
Requirement Confirmation: Clearly define the motor power, voltage, and installation environment (such as whether explosion protection is required), and give priority to models with UL certification.
Channel Selection

Bulk Purchase: Contact Chint North America branch office to obtain the wholesale price.

Urgent Requirements: Check the in-stock situation through distributors such as Newark and Digi-Key.

Compliance Review: Require suppliers to provide UL certification documents and certificates of origin to ensure compliance with the market access requirements of the United States.

If you need further assistance, you can contact us via WhatsApp (+86-13811255435), and we will provide real-time quotations and logistics solutions.

The following is a professional installation guide for Chint NJR2-300 Soft Starter. Combining the North American market specifications and the equipment characteristics, it provides full-process operation suggestions from hardware installation to parameter debugging:

Preparation Before Installation
Unboxing Inspection

– Check the model NJR2-300 against the motor power (suitable for squirrel-cage asynchronous motors below 300kW), and inspect the integrity of the accessories (including the bypass contactor, installation screws, and instruction manual).

– Check that the appearance of the equipment is free from damage, and confirm the UL Certification Mark (the specific certification status needs to be verified by Chint North America customer service).

Tool List

– Essential: Digital multimeter, torque wrench (torque range 2-10N·m), wire crimping pliers, insulating tape.

– Optional: Oscilloscope (for harmonic analysis), phase sequence meter (to verify the power phase sequence).

Installation Environment Requirements

Parameter	Standard Requirements	Adaptation Suggestions for the North American Market
Altitude	≤2000m	A 10% derating is required when the altitude exceeds 2000m
Temperature	-10°C to 40°C	A forced air cooling module needs to be installed in high-temperature environments
Humidity	≤90% (no condensation)	A dehumidifier is recommended in humid areas
Vibration	≤0.5g	A shock-absorbing base needs to be added in areas with severe vibration
Protection Level	IP20 (needs to be installed in a control cabinet)	An IP54 protection enclosure needs to be selected for outdoor use

III. Hardware Installation Steps

Main Circuit Wiring

Power Input: Connect the three-phase AC380V (±15%) power supply to the R/S/T terminals through a circuit breaker, ensuring that the wire diameter is ≥ 16mm² (calculated according to the current).

Motor Output: Use a 10mm² cable to connect the U/V/W terminals to the motor, and avoid cross-wiring with the power input.

Bypass Contactor: Connect the main contacts of the contactor to the U1/V1/W1 terminals, and connect the control wires to the K1 relay output (external power supply is required).

Grounding: Connect the PE terminal to the cabinet grounding busbar, and the grounding resistance ≤ 4Ω (in line with NEC 250.52 requirements).

Control Circuit Wiring

Start/Stop Signal: Connect the external button or PLC signal to the RUN/STOP terminals (passive contacts), and connect the common terminal to COM.

Fault Output: The K3 relay (normally closed contact) can be connected to the alarm system, and it will close when a fault occurs.

Communication Expansion: Connect the RS485 module (external) through the A/B terminals, and the default baud rate is 9600bps.

Mechanical Fixing

– Install it vertically (with a ±5° inclination range), and reserve a heat dissipation space of ≥200mm at the top and bottom.

– Fix it with M6 screws, and control the torque at 6-8N·m to avoid deformation of the casing.

Parameter Setting and Debugging
Basic Parameter Configuration

Parameter Code	Description	Default Value	Suggestions for North American Applications
F00	Starting Voltage	30%	Increase it to 40%-50% for heavy-duty starting
F01	Soft Start Time	25s	Extend it to 30-40s for inertial loads
F06	Current Limiting Multiple	400%	Reduce it to 200%-300% for light loads
F09	Undervoltage Protection	80%	It is recommended to maintain the default value
F10	Overvoltage Protection	120%	It is recommended to maintain the default value
F11	Starting Mode	1 (Voltage Ramp)	It is recommended to give priority to the聽Current Limiting Mode (0)

Advanced Function Settings

Fire Protection Mode: Set F34 = 1 to disable the overload protection (needs to comply with NFPA 70 standards).

Automatic Restart: Set F14 to 1-3 times, and configure the interval time through F05 (the process requirements need to be confirmed).

Debugging Process
Jog Test

– Disconnect the motor connection wires, short-circuit RUN/COM, and observe whether the display of the soft starter is normal (such as voltage and current).

– Connect the motor, set the jog mode, and test the motor rotation direction (if it rotates in the reverse direction, exchange any two phases of U/V/W).

Loaded Debugging

– Gradually increase the F01 soft start time (increase by 5s each time) until the starting current stabilizes at 2-3 times the rated value.

– Test the soft stop function (set F02 to 5-10s) and observe whether the motor decelerates smoothly.

Verification of Protection Functions

– Simulate the phase loss fault (disconnect any one-phase power supply) to confirm that the equipment triggers the protection and gives an alarm.

– Through the load short-circuit test (professional equipment is required), verify that the response time of the short-circuit protection is ≤ 0.1s.

Safety and Compliance Key Points
Electrical Safety

– Use a multimeter to measure the insulation resistance between R/S/T and PE ≥10MΩ (500V megohmmeter) before powering on.

– Do not touch the U/V/W terminals during operation, and wait for 5 minutes for discharge after the machine stops.

North American Compliance

– Confirm that the equipment has passed the UL 508 certification (contact Chint North America customer service at +1 855-584-7168).

– The wiring needs to comply with the NEC 430 clause, such as motor branch circuit protection and wire temperature rating (it is recommended to use THHN cables).

Maintenance Plan

– Check the temperature of the thyristor radiator (≤70°C) every quarter and clean the dust.

– Calibrate the current transformer every year to ensure the accuracy of the protection parameters.

Troubleshooting of Common Faults

Fault Phenomenon	Possible Causes	Solutions
Starting Failure	The current limiting multiple is too low	Increase the value of F06 to 300%-400%
Overheating Alarm	The ambient temperature is too high	Improve ventilation or install a cooling fan
Output Phase Loss	The bypass contactor contacts are stuck	Replace the contactor and check the control circuit
Communication Interruption	The RS485 wiring sequence is wrong	Confirm the corresponding connection between the A/B terminals and the host computer

VII. Obtaining Official Resources

User Manual: Obtain the NJR2-D series instruction manual through Chint’s official website or by contacting technical support.

Firmware Upgrade: Visit Chint’s industrial service platform to download the latest firmware (version V3.01 and above).

If you need further assistance, you can contact us via WhatsApp (+86-13811255435), provide the equipment serial number and on-site photos, and we will arrange for an engineer to provide remote guidance or on-site service.