WattNode Modbus - Modbus Power and Energy Meters
The WattNode Modbus is a kilowatt hour (kWh) energy and power meter that communicates on a EIA RS-485 network, measures 1, 2, or 3 phases with voltages from 120 to 600 volts Vac and currents from 5 to 6,000 amps in delta (phase to phase) and wye (phase to neutral) configurations.
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Products Details
Diagnostic LEDs
Our diagnostic LEDs provide a per-phase indication of power (green flashing) and negative power (red flashing) to help troubleshoot connection problems, like reversed CTs, or excessive line voltage. The WattNode Modbus meter also has a red/yellow/green communication LED to indicate traffic, configuration problems, bus contention and other conditions. See the manual for full descriptions.
Measurements
- Supports floating point and integer registers
- True RMS Power: Watts (Phase A, B, C, and sum of all phases)
- Reactive Power: VARs (Phase A, B, C, and sum of all phases)
- Power Factor: (Phase A, B, C, and sum of all phases)
- True RMS Energy: Kilo-Watthours kWh (Phase A, B, C, and sum of all phases)
- Reactive Energy: kVAR-hours (All Phases)
- AC Line Frequency
- RMS Voltage: (Phase A, B, C)
- Computed RMS Current: (Phase A, B, C)
- Demand
- Peak Demand
Features
- Small form factor for easy installation inside most electrical panels, see a sample installation diagram
- Pluggable screw terminals for easy wiring
- 0.5% accuracy nominal (see manual for details)
- True RMS power even with leading or lagging power factor and chopped or distorted waveforms
- Measure variable speed drive pumps and motors
- Uses safe CT's (current transformers), output 0.333 Vac at rated current.
- Split core CTs for quick installation
- Solid core CTs are less expensive and prevent tampering
- Bus bar CTs for high current applications (standard and custom sizes)
- UL, cUL Listed - Designed and tested for safety and use throughout North America.
- Assembled in USA, qualified under the Buy American provision in the American Recovery and Reinvestment Act of 2009 (ARRA).
- Five year warranty
Specification
Modbus Communication
- Protocol: Modbus RTU (binary)
- Baud Rates: 2,400, 4,800, 9,600,19,200, and 38,400 baud
- Duplex: Half (two-wire plus common)
- Parity (default): N81 (no parity, eight data bits, one stop bit)
- Modbus Buffer: 256 bytes
- Response Time (typical): 5 to 25 milliseconds
EIA RS-485 Interface
- Driver Output Voltage (Open Circuit): ± V maximum
- Driver Output Voltage (54Ω load): ± 1.5 V minimum
- Driver Output Current (54Ω load): ± 60 mA typical
- Driver Output Rise Time (54Ω || 50 pF load): 900 nS typical
- Receiver Common-Mode Voltage Range: –7 to +12 Vdc maximum
- Receiver Sensitivity: ±200 mV
- Receiver Bus Load: 1/8 unit load
Electrical
- Line powered
- Operating Voltage Range: –20% to +15% of nominal
- Power Line Frequency: 50 or 60 Hz
- CT Input: 0.333 Vac nominal, 0 to 0.5 Vac operating, 3 Vac maximum
Measurement Configurations
Models available for:
- Single phase: two or three wire
- Three phase: four wire wye
- Three phase: three wire delta
- Three phase: four wire delta
Accuracy
- 0.5% nominal (see manual for details)
- 0.5% nominal (see manual for details)
- Meets the accuracy requirements of the ANSI C12.1 standard when used with CCS CTs rated for IEEE C57.13 class 0.6 accuracy (see Revenue Grade CTs).
- Models RWNC-3Y-208-MB, RWNC-3D-240-MB and RWNC-3Y-480-MB are certified by MET Laboratories to meet ANSI C12.1. MET Labs is a nationally recognized testing laboratory (NRTL).
Regulatory
- FCC Class B, EN 55022 Class B
- UL and cUL Listed (UL 61010-1), file number E312220
- CE Mark and RoHS
- Immunity: EN 61326: 2002 (Industrial Locations)
Environmental
- Operating Temperature: –30°C to +55°C (–22°F to +131°F)
- Altitude: Up to 2000 m (6560 ft)
- Operating Humidity: 5 to 90% relative humidity (RH) up to 40°C, decreasing linearly to 50% RH at 55°C.
- Pollution: POLLUTION DEGREE 2 - Normally only non-conductive pollution; occasionally, a temporary conductivity caused by condensation must be expected.
- Indoor Use: Suitable for indoor use.
- Outdoor Use: Suitable for outdoor use when mounted inside an electrical enclosure (Hammond Mfg., Type EJ Series) that is rated NEMA 3R or 4.
Mechanical
Case Dimensions
(Click on the image for a larger view.)
- Enclosure:
- High impact, ABS plastic
- Flame Resistance Rating: 94V-0, IEC FV-0
- Size: 5.63 × 3.34 × 1.5 in. (143 × 85 × 38 mm)
- Weight: 10.8 oz (305 g)
- Connectors: Euroblock style pluggable screw terminal blocks
- Green: 22 to 12 AWG (1.0 to 3.2 mm), 600 V
- Black: 22 to 12 AWG (1.0 to 3.2 mm), 300 V
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