The NJR2 Series Soft Starter is a high-performance electronic starter designed to control the acceleration and deceleration of three-phase squirrel-cage induction motors. By precisely managing the voltage applied to the motor, the NJR2 eliminates the high inrush currents and violent mechanical torque spikes associated with traditional "Direct-on-Line" (DOL) or Star-Delta starting methods.

Covering a wide power range from 7.5kW to 315kW, the NJR2 series is the ideal solution for protecting your mechanical infrastructure. It significantly extends the lifespan of belts, gears, and bearings while reducing the "water hammer" effect in pumping systems and voltage dips in sensitive electrical grids.

• Smooth Torque Control: Provides a gradual ramp-up of voltage, ensuring a linear increase in torque. This prevents mechanical shock to the drivetrain and avoids damage to fragile products on conveyor lines.

• Current Limiting Function: Effectively restricts the starting current to a user-defined level (typically 2 to 4 times the rated current), allowing motors to start on "weak" grids without tripping breakers or affecting other equipment.

• Multiple Starting Modes: Features Current Limit Start, Voltage Ramp Start, and Kick-Start modes, allowing for optimized performance whether you are starting a low-inertia fan or a high-friction crusher.

• Comprehensive Motor Protection: Integrated protection suite includes Phase Loss, Overload, Over-temperature, Under-voltage, and Unbalanced Current monitoring, eliminating the need for extra external protection relays.

• Rugged Industrial Design: Built to withstand harsh environments, the NJR2 features high-quality thyristor modules and advanced microprocessor control for 24/7 industrial duty cycles.

1. Centrifugal Pumps: Eliminating water hammer in pipes during start-up and shutdown, reducing maintenance costs on valves and seals.

2. Industrial Fans & Blowers: Reducing belt slippage and mechanical wear during the high-inertia acceleration phase.

3. Conveyor Systems: Ensuring a smooth start to prevent materials from toppling or belts from snapping under sudden torque.

4. Compressors & Crushers: Limiting the peak current demand on the factory’s power transformer during heavy-load starts.

• User-Friendly Interface: Features a clear LED/LCD display and a straightforward keypad for rapid parameter setting and fault diagnosis.

• Modbus Communication Ready: Can be easily integrated into PLC and SCADA systems for centralized monitoring and remote start/stop control.

• Simplified Wiring: The integrated design reduces cabinet space and wiring complexity compared to traditional contactor-based Star-Delta starters.

• Thermal Efficiency: Optimized heat sink design and intelligent cooling fan control ensure stable operation even in elevated ambient temperatures.

Q: Does the NJR2 require an external bypass contactor?

A: To ensure long-term reliability and minimize heat generation during continuous running, we recommend using an external bypass contactor. The NJR2 provides dedicated "bypass" output terminals to control this contactor automatically once the start-up ramp is complete.

Q: How does a Soft Starter differ from a VFD?

A: A Soft Starter is used to manage the start and stop phases of a motor to reduce current and torque spikes. A VFD (Variable Frequency Drive) can control the motor's speed throughout its entire operation. If you don't need speed control, a soft starter is a much more cost-effective and compact solution.

Q: Can it be used for 60Hz power grids?

A: Yes, the NJR2 is designed to operate reliably on both 50Hz and 60Hz industrial power networks.