Variable-load monitor with shock-load detection
The Unipower HPL130A is designed for machines with rapidly changing loads, such as crushers or mixers. It measures true motor power on 3x400 V networks and incorporates dynamic dP/dt (rate-of-change) and dU/dt detection to recognise sudden load increases or decreases. A built-in CT monitors currents up to 8 A and the unit provides both high/low kW limits and an adjustable dP/dt alarm. An isolated analogue output and an SPDT relay deliver flexible interfacing.
Technical Highlights 🔧
- Supply/measuring voltage: 3x120-575 VAC; this model configured for 3x400 VAC.
- Current range: internal 0.5-8 A via built-in CT; external N/1 or N/5 CT optional.
- Detection: simultaneous monitoring of kW and rate-of-change (dP/dt) or voltage change (dU/dt).
- Adjustable start delay and reaction timer to prevent false trips.
- Outputs: isolated 4-20 mA analogue signal and SPDT relay rated 250 VAC/5 A.
- Mechanical: panel mounting Noryl housing; IP54 front; operating 15 +50 °C; weight 0.4 kg.
Benefits ✅
- Detects sudden process changes such as jams or product surge using dP/dt detection.
- Provides both static and dynamic load limits for comprehensive motor protection.
- Built-in CT and analogue output simplify integration with control systems.
- Widely programmable voltage range suits most industrial networks.
Applications 🚀
- Crushers, mixers and extruders where load fluctuations signal jams or product feed issues.
- Pumps with changing viscosity or variable-speed drives.
- Automation systems requiring both kW and dP/dt alarms.
The HPL130A offers advanced protection for variable-load machines by measuring true power and detecting rapid load changes, ensuring fast response to potential faults.
FAQs
- Q: What is dP/dt detection?
A: The device calculates the rate of change of power (dP/dt). Rapid increases or decreases beyond the adjustable threshold trigger the alarm, allowing detection of jams or blockages.
- Q: Can I disable the dP/dt function?
A: Yes. You can set separate limits for static kW and dynamic dP/dt or turn off the dP/dt alarm as needed.
- Q: Is there an analogue output?
A: The HPL130A includes an isolated 4-20 mA output proportional to the motor load for connection to indicators or control systems.