Correct Model Selection for Your Project
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Verify that this model matches your voltage, current, and load type.
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Unsure which model is suitable? Our engineering team will confirm the correct model before shipment.
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Need custom solutions or a fast project quote? Contact us – we respond within 12 hours.
Contact Us
Email: ann@softstarterpro.com
💬 WhatsApp: +8618006697926
Project & Ordering FAQs
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What info is needed for a project quote?
Motor type, voltage, current/power, application, quantity, environment. -
Can I order a single unit for testing?
Yes, sample orders available for engineering evaluation. -
Do you support custom solutions?
Yes, OEM/ODM and custom control options available. -
Lead time & delivery?
Standard: 3-5 working days. Custom: depends on requirements. -
Technical support & documentation?
Pre-sales and after-sales support, manuals, diagrams, and wiring guidance provided.
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Specification
- Model: RQ900-22KW 440V
- Current: 44A
- Voltage: 440V
- Dimension: 272*146*160MM
- Gross Weight: 4KG
Product Description
The Aigoodele LSRQ900 series is a robust three-phase motor soft starter engineered for 30HP (22kW) AC motors operating on 440V-460V systems with ±15% voltage tolerance. This industrial-grade controller delivers reliable motor protection and smooth startup performance for demanding applications.
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Dual Voltage Compatibility: Optimized for 440V-460V three-phase systems (±15% tolerance)
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Enhanced Current Rating: 44A capacity for 30HP motor applications
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Soft Start & Stop Control: Smooth acceleration and deceleration to minimize mechanical stress
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RS485 Communication Interface: Enables seamless system integration
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Comprehensive Protection: Reduces inrush current and extends equipment lifespan
Applications
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Industrial manufacturing equipment
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Pump and compressor systems
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HVAC and large ventilation systems
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Material handling conveyors
Note
Professional installation and correct parameter configuration are essential. Verify that your power supply voltage matches the starter's 440V-460V specifications before operation.
Advanced Specifications
| Parameter | Specification |
| Starter Type | Bypass Type |
| Starting Method | Current Limiting / Voltage Ramp / Surge Voltage Ramp |
| Stop Method | Free Stop / Soft Stop |
| Current Limit Range | 50% ~ 600% adjustable |
| Voltage Ramp Time | 1s ~ 120s adjustable |
| Soft Stop Time | 1s ~ 60s adjustable |
| Cooling Method | Natural Cooling |
| Communication | RS485 Modbus RTU |
| Protection Class | IP20 |
| Ambient Temperature | -25°C ~ +40°C |
| Installation | Wall-mounted |
Comprehensive Motor Protection Functions
| Protection | Description |
| Overload | Adjustable grade 0–30, startup & running |
| Over/Under Voltage | Trips at abnormal supply voltage |
| Phase Loss | Input & output phase loss detection |
| Phase Imbalance | Adjustable threshold, auto shutdown |
| Underload | Prevents pump dry-running & cavitation |
| Overtemperature | Internal thermal monitoring |
| SCR Fault | Thyristor breakdown detection |
| Fault Memory | Last 12 fault records stored |
Frequently Asked Questions
Q: What is the difference between bypass type and online type? Which should I choose?
A: Bypass type switches to a bypass contactor after startup, eliminating SCR heat loss — lower energy consumption and easier wiring. Online type keeps the SCR active during running. We recommend bypass type for most applications, especially if you want simpler installation and lower running costs.
Q: How do I select the right soft starter size for my motor?
A: General rule:
- Heavy-duty loads (compressors, conveyors): choose 2 sizes up from motor rating
- Light-duty loads (fans, pumps): choose 1 size up or match motor rating
👉 For detailed selection guidance, refer to our soft-starter-selection-guide
Q: Can a soft starter control motor speed?
A: No. A soft starter only controls startup and stop — it cannot vary speed during running. If you need variable speed control, please choose a VFD (Variable Frequency Drive) instead.
Q: Is it compatible with synchronous motors?
A: No. This soft starter is designed for squirrel cage induction motors (asynchronous) only. It is not compatible with synchronous motors or wound rotor (slip ring) motors.
📄 Download Manual LSRQ900 Series Soft Starter Manual
