The Unipower HPL110.380-440 is a compact power-based load monitor for 3-phase AC motors. It uses real-time kW measurement based on the formula P = √3 x U x I x Cos? to supervise mechanical load conditions. Peak detectors and adjustable Min/Max limits enable precise control, while built-in current conversion supports up to 8A directly and above using a current transformer.
🔧 Technical Highlights:
- Measuring Voltage: 3 x 380-440V AC
- Current Range: Up to 8A internal, external N/1 or N/5 CT supported
- Trip Limits: 5-100% (Max), 0-100% (Min)
- Timers: Start (Ts) and Reaction (Tr) adjustable 0.1-25s
- Output: Single relay, Min or Max configurable
✅ Benefits:
- True power-based protection, not affected by Cos? or voltage variations
- Peak detection for easy setpoint tuning
- Adjustable hysteresis for use with auto-reset mode
🚀 Applications:
- Pumps and fans
- Mixers and conveyors
- General industrial motor loads
Provides reliable monitoring even on variable speed drives and distorted current waveforms. Unlike Cos? and current detection, kW is linear with motor load and impervious to Cos? and supply voltage variations.
FAQs
- Q: What is the difference between HPL110 and HPL110A?
A: HPL110 is a simpler digital motor load monitor focused on relay protection, while HPL110A adds a 4-20 mA analogue output and extended features for process monitoring.
- Q: Does HPL110 need an external CT for all motors?
A: No. Smaller motors can be measured directly up to the internal CT rating. External CTs are only required for higher currents.
- Q: Can I use HPL110 with conveyors as well as pumps?
A: Yes. HPL110 can be used for general overload and underload protection on many types of machinery, including conveyors, fans and mixers.