Product Description
The SoftStarterPro LSRQ900 series is a high-current three-phase motor soft starter engineered for 30HP (22kW) AC motors operating on 220V-240V systems with ±15% voltage tolerance. This robust controller provides reliable motor protection and smooth startup performance for low-voltage applications.
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Low Voltage Compatibility: Suitable for 220V-240V three-phase systems (±15% tolerance)
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High Current Rating: 90A 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 Motor Protection: Reduces inrush current and extends equipment lifespan
Applications
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Low-voltage industrial pump systems
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Compressor and refrigeration equipment
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Ventilation and fan systems
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Material handling conveyors
Note
This soft starter is specifically designed for 220V-240V low-voltage applications. Professional installation and correct parameter configuration are essential for safe and efficient 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
