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Load monitor with 4-20mA output, peak detection and hysteresis control for AC motors

The Unipower HPL110A is a compact digital motor load monitor for 3x380-440 Vac motors, using true kW measurement to act as a shaft power monitor for pumps, conveyors and other driven machines. It combines min and max load limits, peak detection, hysteresis control and a 4-20mA analogue output in a 72 x 72 mm panel mount unit. Other voltage variants are available on special request, making the HPL110A a flexible choice for accurate motor load protection and process monitoring.

Stock Code: HPL110A.415

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The Unipower HPL110A is a compact digital motor load monitor for 3x380-440 Vac motors, using true kW measurement to act as a shaft power monitor for pumps, conveyors and other driven machines. It combines min and max load limits, peak detection, programmable hysteresis and a 4-20 mA analogue output in a 72 x 72 mm panel mount unit. Other mains voltage versions are available on special request, making the HPL110A a flexible choice for accurate motor load protection and process monitoring.

🔧 Technical Highlights

     
  • Supply and measuring voltage: Standard model for three phase 3x380-440 Vac motors; other fixed supply variants are available to special order.
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  • Current range: Built in current transformer for direct measurement up to 8 A full scale, with external n:5 CTs used for higher currents.
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  • Measured value: True motor load in kW, displayed as percent of the selected measurement range on a digital display.
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  • Load limits: One Max and one Min limit detector share a SPDT relay (Limit 1 = Off or Max, Limit 2 = Off or Min) for over and underload protection.
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  • Hysteresis and reset: Programmable hysteresis band between trip and reset levels ensures stable operation without relay chatter.
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  • Start timer: Adjustable start delay masks the high inrush and transient load during motor start.
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  • Response time: Fast electronic measurement with typical reaction times of a few tens of milliseconds.
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  • Analogue output: 4-20 mA analogue output proportional to motor load (percent kW) for PLC or SCADA.
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  • Programming: All parameters set from the front panel using three push buttons and the digital display.
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  • Mounting: 72 x 72 mm panel mount (approx. 70 x 70 mm cut out) with a clear front panel indication of motor load and status.

✅ Benefits

     
  • True kW based protection follows real shaft load and torque, not just current.
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  • Overload and underload protection in one unit using Min and Max limits.
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  • Digital percent kW display and peak detection simplify commissioning.
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  • Sensorless machine protection using the motor as the load sensor.
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  • 4-20 mA output provides a clean motor load signal for PLC and SCADA.

🚀 Typical Applications

     
  • Pumps: dry run protection, blocked strainers, closed valves and cavitation detection.
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  • Conveyors: jam and overload protection for screw, belt and bucket conveyors.
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  • Fans and blowers: detection of broken belts, closed dampers and abnormal airflow.
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  • Separators and screens: supervision of load on screens, macerators and scrapers.
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  • Mechanical drives: indication of mechanical stress on gearboxes and couplings.

HPL110A is a proven digital motor load monitor that gives fast, accurate kW based protection and a clear picture of how your machine is really loaded. It is a simple way to upgrade from basic current protection to true shaft power monitoring on standard three phase motors.

FAQs

     
  • Q: What motor sizes can I use HPL110A with?
          A: HPL110A measures up to 8 A directly. For higher currents you can use a standard n:5 current transformer to match the motor current to the internal range.
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  • Q: Is HPL110A suitable for pump dry run protection?
          A: Yes. By setting suitable Min and Max limits, HPL110A can detect both low load (dry running or loss of medium) and high load (blockages or closed valves) on pumps.
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  • Q: Can I use the 4-20 mA output with my PLC?
          A: The 4-20 mA output is designed for direct connection to PLC analogue inputs, giving a signal proportional to motor load in percent kW.
Supply Voltage3x380-440Vac
Output Relay / ChannelsSPCO
Output Relay Rating5A @ 230V
MountingPanel Mount
Size72 x 72
ProtectionIP54
Weight0.49
Type File Name
Data Sheet HPL110A.pdf

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