The SeeZol Crane Load Moment Indicator (LMI for Cranes) System also known as Crane Safe Load Indicator (SLI) is a core device that ensures the safe operation of equipment, with its technical parameters directly impacting protection accuracy and reliability. Below are the key specifications and functional descriptions of a typical system:
1. Moment Monitoring Range
Rated Moment: Typically covers 50%~150% of the crane’s rated load (e.g., 50-300 kN·m), supporting dynamic calibration.
Accuracy Class: ±3% FS (Full Scale), with high-precision models achieving ±1% (utilizing strain gauges and digital filtering technology).
2. Multi-Level Protection Thresholds
Warning Threshold: Set at 90% of rated moment (audible/visual alarm).
Primary Protection: At 105%, automatic speed reduction is triggered.
Secondary Protection: At 110%, hoisting power is cut off, and mechanical braking is activated.
3. Response Time
≤50 ms from moment overload to protective action (based on PLC or dedicated controllers).
4. Sensor Configuration
Strain Sensors: Installed at the boom root, with impact resistance ≥50g.
Angle Sensors: Real-time monitoring of boom elevation angle (±0.1° accuracy) for moment calculation compensation.
5. Environmental Adaptability
Operating Temperature: -30°C to +70°C (IP65 protection rating), with EMI resistance (EN 61000-6-2 compliant).
6. Data Interfaces
Standard RS485/CAN bus, supporting remote monitoring (ISO 2386 protocol compatible).
Conclusion: SeeZol moment limiting systems effectively prevent overload accidents through high-precision sensing, rapid response, and redundant design. Regular parameter calibration is essential to ensure reliability.
