The NJR2 Series Soft Starter is an advanced electronic starter designed for the smooth acceleration and deceleration of three-phase squirrel-cage induction motors. By utilizing high-performance thyristor technology, the NJR2 replaces traditional Direct-on-Line (DOL) and Star-Delta starters, effectively eliminating the violent mechanical shocks and high electrical inrush currents that damage motors and power grids.
With a versatile power range spanning from 7.5kW up to 315kW, the NJR2 is the ideal choice for heavy-duty industrial applications. It protects your mechanical assets—belts, gears, bearings, and pumps—while ensuring that your electrical system remains stable during every start-up cycle.

• Optimized Current Limiting: Effectively restricts starting current to 2–4 times the rated current. This allows large motors to start on limited-capacity power supplies without causing voltage dips or tripping breakers.

• Adjustable Starting Modes: Features multiple start-up curves, including Voltage Ramp, Current Limit, and Kick-Start (for high-friction loads like crushers or conveyors), ensuring optimal performance for any application.

• Soft Stop Function: Gradually reduces voltage during shutdown. This is critical for pumping applications as it prevents the "water hammer" effect that causes pipe bursts and valve damage.

• Full-Spectrum Protection: No need for extra relays. The NJR2 includes built-in protection for Phase Loss, Overload, Under-voltage, Over-temperature, and Current Unbalance.

• Modbus Communication Ready: Easily integrates into factory automation systems (PLC/SCADA) for remote monitoring, status reporting, and centralized control.

1. Industrial Centrifugal Pumps: Prevents mechanical wear on seals and eliminates hydraulic shock in piping systems.

2. Conveyor & Assembly Lines: Ensures smooth acceleration to prevent fragile products from toppling or belts from slipping.

3. Fans & Blowers: Reduces the high torque stress on drive belts and bearings during the initial acceleration of high-inertia blades.

4. Compressors & Mills: Provides the high-torque "kick-start" required for heavy mechanical loads while keeping current peaks under control.

• Simplified Cabinet Wiring: The integrated control logic reduces the need for complex control wiring and multiple contactors, saving labor time and cabinet space.

• User-Friendly HMI: Features a bright LED display and a straightforward keypad for rapid parameter adjustment and clear fault code diagnostics.

• Superior Thermal Management: High-grade thyristor modules and oversized heat sinks ensure the starter operates reliably even in high-temperature industrial environments.

• Bypass Output Control: Includes dedicated terminals to control an external bypass contactor, allowing the thyristors to "rest" during steady-state operation, significantly extending the device's lifespan.

Q: When should I choose an NJR2 Soft Starter instead of a VFD?
A: If your application requires a smooth start and stop but operates at a constant speed, the NJR2 Soft Starter is a much more economical, compact, and reliable choice. VFDs are only necessary if you need to vary the motor's speed during its run-time.
Q: Can I use one NJR2 to start multiple motors?
A: It is possible through a specialized "cascade" control scheme, but we generally recommend one starter per motor to ensure that the individual motor protection settings (like overload) remain accurate and safe.
Q: What is the benefit of the "Soft Stop" feature?
A: In pumping systems, stopping a motor suddenly causes a pressure wave (water hammer). The Soft Stop feature ramps the voltage down slowly, allowing the check valves to close gently and protecting the integrity of the plumbing.