Load monitor with automatic reverse unblocking
The Unipower HPL540 monitors motor load on single-phase or three-phase networks (100-575 V) and reverses the motor automatically to clear jams when the load exceeds a preset limit. A single programmable limit controls two relays: one for forward operation and one for reverse. An isolated analogue output provides continuous kW feedback.
Technical Highlights 🔧
- Supply/measuring voltage: 1x100-400 V or 3x100-575 V; frequency 45-65 Hz.
- Current range: 0.5-40 A via built-in CT; external CT extends range.
- Relays: two outputs - relay 1 controls forward operation, relay 2 triggers reverse when load limit is exceeded; rated 250 VAC/5 A.
- Analogue output: 0(4)-20 mA isolated for load feedback.
- Programmable max limit and delay for auto reverse; optional shaft power correction.
- DIN-rail mounting; CE and UL approvals.
Benefits ✅
- Automatically reverses conveyors or augers to clear blockages, reducing downtime.
- Single limit simplifies setup yet covers overload protection and jam removal.
- Universal voltage and current range suits a wide range of motors.
- Analogue output allows remote monitoring of motor load.
Applications 🚀
- Conveyor systems requiring automatic reverse to clear jams.
- Feed screws and augers that may block due to product build-up.
- Packaging machinery where a reverse cycle frees obstructions.
The HPL540 ensures reliable load monitoring and automatic reversing to clear jams, enhancing productivity in conveyor and material handling systems.
FAQs
- Q: How does the auto-reverse function work?
A: When the motor load exceeds the programmed limit for a set time, the HPL540 de-energises the forward relay and energises the reverse relay to run the motor backwards and clear the blockage.
- Q: Can the analogue output be used simultaneously?
A: Yes, the isolated 0(4)-20 mA output provides continuous load feedback irrespective of relay states.
- Q: Does the unit support shaft power correction?
A: Optional shaft power (P2) correction can be configured to measure mechanical output power more accurately.