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The HLM (HLMU) series is a universal voltage, encapsulated, three-phase voltage monitor. This monitor continuously measures the voltage of each of the three phases with microcontroller accuracy and compares the value to preset trip points. It separately senses phase reversal and loss; over, under and unbalanced voltages; and over or under frequency. Protection is ensured during periods of large average voltage fluctuations or when regenerated voltages are present. The unit trips within 200 ms when phase loss is detected. Adjustable time delays are included to prevent nuisance tripping and short cycling of sensitive equipment. The isolated, 10 A, DPDT relay contacts trip when a phase voltage exceeds the trip limits for the trip delay. Nominal line voltage, voltage unbalance, and time delays are knob adjustable. The phase loss setpoint and the acceptable frequency range are fixed. Both delta and wye systems can be monitored - no connection to neutral is required.
See datasheet for operation details.
- Proprietary microcontroller-based circuitry
- Universal line voltage range
- DIN-rail (35mm) or surface mounting
- LED indication
- Encapsulated
- Finger-safe terminal blocks
- Constant monitoring to protect against phase loss, phase reversal, overvoltage, undervoltage, unbalanced voltage, short cycling, over/under frequency
- Flexibility to work in 200 to 480 V ac applications
- Installation flexibility
- Provides diagnostics of relay, fault, and time-delay status
- Protects against shock, vibration, and humidity
- Meets IEC 61000 safety requirements
HLM Parts
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HLM Applications
- Used in a variety of applications
