Load monitor with analogue output and built-in CT
The Unipower HPL110A extends the capability of the HPL110 by adding a galvanically isolated 4-20 mA analogue output proportional to motor load. It measures true kW on 3x415 V motors with a built-in 8 A current transformer and provides adjustable high and low limits, start delay and reaction timers. A single SPDT relay and the analogue output allow integration into control systems.
Technical Highlights 🔧
- Supply/measuring voltage: 3x220-380-460-575 VAC (this model factory-set for 415 V).
- Current range: 0.5-8 A via built-in CT; external N/1 or N/5 CT.
- Analogue output: 4-20 mA proportional to motor load.
- Adjustable limits: independent max/min load settings and hysteresis with start and reaction timers.
- Relay output: SPDT contact rated 250 VAC/5 A.
- Housing: Noryl enclosure for panel mounting, IP54 front, weight approx 0.5 kg.
Benefits ✅
- Provides both load protection and a 4-20 mA feedback signal for PLCs or SCADA systems.
- Measures true kW ensuring accurate detection of overload and under-load conditions.
- Start and reaction timers avoid nuisance trips during motor starting or transient events.
- Built-in CT simplifies installation for currents up to 8 A.
Applications 🚀
- Motor load monitoring with analogue signal feedback for automation systems.
- Pumps, grinders and conveyors requiring precise kW measurement and alarm outputs.
- Integration into control loops for process optimisation based on motor load.
The HPL110A offers accurate motor protection along with an analogue 4-20 mA signal, making it ideal for applications requiring real-time load feedback.
FAQs
- Q: Can I use the HPL110A on other voltages besides 415 V?
A: Yes. The HPL110A can be supplied with a wide range of 3-phase voltages from 220-575 VAC; the 415 V model is factory-configured for this network.
- Q: Is the analogue output isolated?
A: The 4-20 mA output is galvanically isolated, allowing connection to PLCs without ground-loop issues.
- Q: How do I set the load limits?
A: Two potentiometers allow adjustment of max and min kW set-points, and timers adjust the start delay and reaction delay.