Detailed Description:
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Soft Starting & Stopping: Achieves gentle motor acceleration (soft start) by gradually increasing voltage and can also achieve gentle deceleration and stopping (soft stop) by gradually decreasing voltage. Ideal for applications like pumps, fans, and conveyor belts where reducing water hammer, vibration, or material slippage is important.
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Integrated Bypass Function: The suffix “1FA31” in the model number indicates that this soft starter integrates a bypass contactor. After startup is complete, this contactor engages, switching the motor main circuit to bypass mode. This ensures the thyristors only operate during start and stop phases, reducing energy consumption and temperature rise.
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Protection Features: Provides comprehensive motor protection, including overload protection, phase loss protection, motor stall protection, and thyristor overtemperature protection.
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Flexible Control: Supports multiple control modes, including voltage ramp start and current limit start. Offers local control terminals (e.g., Start, Stop, Reset) and programmable relay outputs for status indication or interlocking with other devices.
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Compact Design: Features a modular, compact design for mounting on standard DIN rails, saving control cabinet space. The front panel includes LED indicators showing power, run, fault, and other statuses.
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Application Areas: Widely used for motor control of loads such as fans, pumps, compressors, conveyors, and mixers. Particularly suitable for applications with frequent starts/stops or where strict limits on grid inrush currents are required.
Key Specifications:
| Parameter | Details |
|---|---|
| Model | 3RH1921-1FA31 |
| Series | SIRIUS 3R |
| Rated Operational Current | 40 A (at 40°C ambient temperature) |
| Rated Control Supply Voltage | Typically 24 V DC or 110-240 V AC (depends on ordering code) |
| Motor Rated Power | Suitable for approx. 18.5 kW / 25 HP three-phase motor (at 400V) |
| Start Control | Voltage Ramp Start, optionally Current Limit Start |
| Integrated Feature | Built-in Bypass Contactor |
| Protection Functions | Overload, Phase Loss, Stall, Thyristor Overtemperature |
| Control Inputs | Digital inputs for Start, Stop, Reset, etc. |
| Relay Outputs | Programmable relay contacts for status or fault indication |
| Protection Rating | IP20 (for installation inside control cabinet) |
| Mounting | DIN Rail Mounting |
| Commissioning | Basic settings via potentiometers or DIP switches on the unit |
