Product Description
The RQ6000-320KW is an online three-phase soft starter for 380V induction pump motors, rated 640A. Built on thyristor (SCR) technology with microprocessor control, it delivers precise, smooth acceleration, replacing star-delta and auto-transformer starters with reliable protection and no external bypass contactor required.
Key Features
- 3 start modes: Current-limit / Voltage-ramp / Kick-start ramp
- 2 stop modes: Free stop / Soft stop (prevents water hammer)
- Thyristor-based precision control for smooth, accurate acceleration
- Real-time 3-phase current display with independent calibration
- Bilingual LCD (Chinese/English), dual programmable relay outputs
- RS485 Modbus RTU (standard) + 4-20mA analog output for remote monitoring
Applications
- Large Pump Stations, thyristor-based precision control ensures stable acceleration under high load
- Compressors, controlled acceleration protects valves and reduces pressure spikes
- Conveyors, gentle load engagement, less mechanical shock on belts and gearboxes
- Fans & Blowers, smooth start reduces mechanical stress
Technical Parameters
| Parameter | Specification |
|---|---|
| Model | RQ6000-320KW |
| Rated Power / Current | 320kW (430HP) / 640A |
| Input Voltage | AC380V ±15%, 50/60Hz |
| Applicable Motor | Squirrel-cage induction motor |
| Enclosure | Steel enclosure |
| Start Modes | Current-limit (50–600% adj.) / Voltage-ramp / Kick-start ramp |
| Stop Modes | Free stop / Soft stop |
| Protection Rating | IP00 (requires cabinet or indoor installation) |
| Cooling | Forced air (dual fan) |
| Communication | RS485 Modbus RTU (standard) |
| Analog Output | 4–20mA |
| Protections | Phase loss, overload, overcurrent, over/under-voltage, 3-phase imbalance, underload, start timeout |
| Ambient Temp / Altitude | -25°C~+40°C / ≤2000m |
| Starting Frequency | ≤15 starts/hour |
Selection Tip
Recommended soft starter power = Motor Power × Load Factor (Pump/Fan: 1.2, Conveyor: 1.3, Compressor: 1.5, Crusher/Mixer: 1.6). Not sure which factor applies? Use our Soft Starter Selection Calculator: https://www.softstarterpro.com/blogs/selection-tools/soft-starter-selection-guide
