GW-LM72 Series Digital Multifu
The GW-LM72 series three-phase digital meters are built around industrial-grade microprocessors, delivering high processing speed and excellent cost-performance. The GW-LM72-3MP is a three-phase multifunction meter, the GW-LM72-3I is a three-phase ammeter, and the GW-LM72-3V is a three-phase voltmeter.The GW-LM72 series is mainly designed for distribution cabinets with limited installation space. It is well suited for low-voltage cabinets and floor distribution boxes with strict space requirements, helping users save both investment costs and installation space.
Industry Certifications & Standards
ISO 9001
Quality Management
Certified
EU Compliance
MID
Measuring Instruments
RoHS
Hazard-Free Materials
IEC 62053
Metering Accuracy
Listed
Safety Standard
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About the Power Meter
The digital power meter provides accurate measurement, reliable performance, and flexible functions for power monitoring and energy management.
| Parameter | Value |
|---|---|
| Voltage Inputs (V1, V2, V3, VN) | |
| Standard Un | 240ULN / 415ULL |
| Range | 42V to 264V ULN |
| Overload | 1.1 × Un continuous |
| Burden | <0.02VA per phase @ 240ULN |
| Measurement Category | CAT III up to 300V |
| Frequency | 45–65Hz |
| Current Inputs (I11, I12, I21, I22, I31, I32) | |
| Standard In | 5A / 1A |
| Range | 0.1% to 120% In |
| Starting Current | 0.1% In |
| Overload | 1.2 × In continuous, 10 × In for 1s |
| Burden | <0.25VA per phase @ 5A |
| Power Supply (L+, N-) | |
| Standard | 95–250VAC/DC, ±10%, 47–440Hz |
| Burden | <2W |
| Overvoltage Category | OVC III up to 300V |
| Digital Inputs (DI1, DI2, DI3, DI4, DIC) | |
| Type | Dry contact, 12VDC internally wetted |
| Sampling | 1000Hz |
| Hysteresis | 1ms minimum |
| Digital Outputs (DO11, DO12, DO21, DO22) | |
| Type | Form A Mechanical Relay |
| Loading | 5A @ 250VAC or 30VDC |
| Load Type | Resistive |
| Pulse Outputs (E+, E-) | |
| Type | Form A Solid-State Relay |
| Isolation | Optical |
| Pulse Width | 80ms ± 20ms |
| Max. Load Voltage | 50VDC |
| Max. Forward Current | 50mA |
| Optional Analog Outputs | |
| Type | 0/4–20 mA |
| Loading | 500Ω maximum |
| Overload | 24mA maximum |
| Environmental Conditions | |
| Operating Temp | -25°C to 70°C |
| Storage Temp | -40°C to 85°C |
| Humidity | 5% to 95% non-condensing |
| Atmospheric Pressure | 70 kPa to 106 kPa |
| Altitude | <3000m |
| Pollution Degree | 2 |
| Accuracy | |
| Voltage | ±0.2% |
| Current | ±0.2% |
| Inc | ±1.0% |
| P | ±0.5% |
| Q | ±1.0% |
| S | ±1.0% |
| kWh | Class 0.5S |
| kvarh | Class 1 |
| PF | ±0.5% |
| Frequency | ±0.02Hz |
| AO | ±1.0% |
Product Overview
Anatomy of Precision
GW-LM72-3MP (Multifunction Meter)
Basic Measurements:
ULN and ULL per phase and average; current per phase and average with calculated neutral current; P, Q, S, and PF per phase and total; total RMS kWh and kvarh import/export/net/total and total kVAh; per-phase kWh and kvarh import/export; frequency.
Advanced Measurements:
U and I THD, TOHD, TEHD, TH (RMS), and individual harmonics up to the 31st order; U and I sequence, unbalance, and phase angle; kvarh Q1–Q4; present, predicted, and maximum demands with timestamp; one TOU schedule with 12 seasons, 4 daily profiles, 6 tariffs, and 12 monthly energy records.
Setpoints:
6 user-programmable setpoints covering voltage, current, power, demand, unbalance, phase reversal, THD, and more, with configurable thresholds, time delays, and DO triggers.
Max./Min. Log:
Timestamped max./min. logging for real-time values such as voltage, current, Inc, frequency, P, Q, S, PF, unbalance, and THD.
SOE Log:
16 events time-stamped to ±1 ms resolution, including setup changes, setpoint changes, DI status changes, and DO operations.
Inputs and Outputs:
2 digital inputs; 2 Form A mechanical relay outputs; 1 Form A solid-state relay pulse output; optional one-channel 0/4–20mA analog output.
Communications:
Optically isolated RS-485 port at max. 38,400 bps with standard Modbus RTU support.
GW-LM72-3I (Ammeter)
Basic Measurements:
Current per phase and average.
Setpoints:
6 user-programmable setpoints with monitoring parameters including current.
SOE Log:
16 events time-stamped to ±1 ms resolution.
Inputs and Outputs:
Optional one-channel 0/4–20mA DC analog output with programmable zero and full scales.
Communications:
Optically isolated RS-485 port at max. 38,400 bps with standard Modbus RTU support.
GW-LM72-3V (Voltmeter)
Basic Measurements:
ULN and ULL per phase and average, plus frequency.
Setpoints:
6 user-programmable setpoints with monitoring parameters including voltage and frequency.
SOE Log:
16 events time-stamped to ±1 ms resolution.
Inputs and Outputs:
Not provided / none listed.
Communications:
Optically isolated RS-485 port at max. 38,400 bps with standard Modbus RTU support.
Cutout Dimensions and Installation Diagram (Unit: mm)
Device Terminal Diagram
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