WattNode BACnet - Power and Energy Meters
The WattNode BACnet (MS/TP) is a multi-function electric 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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Listed by BACnet Testing Laboratories
BACnet is a registered trademark of the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). ASHRAE does not endorse, approve or test products for compliance with ASHRAE standards. Compliance of listed products to requirements of ASHRAE Standard 135 is the responsibility of BACnet International’s BACnet Testing Laboratories (BTL). BTL® is a registered trademark of BACnet International.
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 BACnet 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.
- 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 average of all phases)
- True RMS Energy: Kilo-Watthours kWh (Phase A, B, C, and sum of all phases)
- Reactive Energy: kVAR-hours (Phase A, B, C)
- AC Line Frequency
- RMS Voltage: (Average and Phase A, B, C; line-to-line and line-to-neutral)
- Computed RMS Current: (Phase A, B, C)
- Demand
- Peak Demand
Specification
BACnet Communication
- Protocol: BACnet MS/TP (RS-485)
- Baud Rates: 9600, 19200, 38400, and 76800 baud
- Duplex: Half (two-wire plus common)
- Parity (default): N81 (no parity, eight data bits, one stop bit)
- BACnet Buffer: 512 bytes (480 byte maximum APDU length)
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
- 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 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).
Regulatory
- Listed by BACnet Testing Laboratories (BTL)
- FCC Class B, EN 55022 Class B
- UL and cUL Listed (UL 61010-1), file number E312220
- CE mark: Declaration of Conformity
- RoHS
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
Features
- Meets ANSI C12.1 accuracy requirements when used with Accu-CT Class 0.6 current transformers.
- Small form factor for easy installation inside most electrical panels, see a sample
- installation diagram
- Pluggable screw terminals for easy wiring
- Nominal accuracy 0.5% (see Installation and Operation Manual for details )
- True RMS power even with leading or lagging power factor and chopped or distorted waveforms
- Measure variable speed motor drives used in HVAC, refrigeration, and pumping systems
- Safe CT’s (current transformers), output 333 mVac at rated current.
- Split core CTs for quick installation
- Solid core CTs are less expensive and prevent tampering
- Custom and standard Bus Bar sized CTs
- UL, cUL Listed, CE Mark—Designed and tested for safety and use throughout North America and the European Union.
- Assembled in USA, qualified under the Buy American provision in the American Recovery and Reinvestment Act of 2009 (ARRA).
- Five year warranty
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