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Description
Application Scenarios:
In a large water treatment plant, multiple high-power pumps are critical for maintaining flow rates. Direct-on-line starting of these 250kW pumps causes severe water hammer effects, pipe stress, and voltage dips that disrupt other sensitive equipment. By integrating the ABB PSTB370-600-70 soft starter, engineers achieve a smooth, stepless ramp-up of voltage and current. The PSTB370-600-70‘s independent control power supply (100-250V AC) allows it to be powered directly from the plant’s standard control circuit, simplifying cabinet design. After start-up, its internal bypass contactor engages, ensuring efficient full-speed operation while protecting the thyristors.
Parameter:
| Parameter | Specification |
|---|---|
| Product Model | PSTB370-600-70 (1SFA894015R7000) |
| Manufacturer | ABB |
| Product Category | Soft Starter / Motor Controller |
| Rated Operational Current (Ie) | 370 A (In-line), 640 A (Inside Delta) |
| Main Circuit Voltage | 208 – 600 V AC, 50/60 Hz |
| Control Supply Voltage (Us) | 100 – 250 V AC, 50/60 Hz |
| Control Circuit Voltage (Uc) | 24 V DC (for external control) |
| Max Motor Power (400V) | ~200 kW (In-line), ~355 kW (Inside Delta) |
| Starting Torque Range | 30% – 70% initial voltage (adjustable) |
| Protection Degree (IP) | IP00 (Chassis Mount) |
| Key Feature | Built-in Bypass Contactor |
Technical Principles and Innovative Values:
- Innovation Point 1: Integrated Bypass Contactor Technology. Unlike basic soft starters that require an external contactor, the PSTB370-600-70 incorporates a built-in bypass mechanism. Once the motor reaches full speed, the bypass contactor closes to carry the full load current. This innovation significantly reduces thyristor heat dissipation during run mode, leading to higher system efficiency, cooler operation, and extended product lifespan.
- Innovation Point 2: Dual Voltage Algorithm Control. The device utilizes advanced thyristor phase-angle control with independent algorithms for voltage ramp and current limiting. This allows it to provide a “soft stop” function, which is critical for pump applications to eliminate water hammer, and a “kick start” function for high-breakaway torque loads like conveyors.
- Innovation Point 3: Wide-Range Control Supply. The PSTB370-600-70 is designed with a wide-range control supply input (100-250V AC). This flexibility makes it highly adaptable to various industrial power quality conditions without needing an external control transformer, reducing component count and potential failure points in the control cabinet.
