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WattNode® BACnet® - kilowatt hour kWh energy and power meter

The WattNode BACnet (MS/TP) 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.
Part Number: WNC BACnet
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$658.00 ex GST
[$723.80 inc GST]

AC Power Measurement
for BACnet Networks,
True Power, kWh
Reactive Power,
VARs, Power Factor,
Individual Phase Measurements

ModelVAC Phase
to Neutral
VAC Phase
to Phase
Electrical
Service Types
Neutral
Required
WNC-3Y-400-BN 230 400 1 Phase 2 Wire 230V with neutral
3 Phase 4 Wire 230V/400V
Yes
WNC-3D-400-BN See Below 400 3-Phase 3-Wire Delta 400V (No neutral)
3-Phase 4-Wire Wye 230/400V
 
  • Delta models, WNB-3D-400-P, work either with or without a neutral connection, but require a line-to-line voltage connection for operating power.

 

WattNode BACnet

The WattNode BACnet (MS/TP) 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.

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 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.

Measurements

  • 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

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), producing 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, 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

Safety Note

Warning: Hazardous Voltages - Only qualified personnel or licensed electricians should install the WattNode meter and current transformers.


The WattNode® BACnet® meter is available with factory options at an additional charge. See the WattNode BACnet manual (pdf) for more information and details about the registers mentioned below.

General Options

  • Option CT=xxx/yyy/zzz - Pre-assign xxx to CtAmpsAyyy to CtAmpsB, and zzz to CtAmpsC.
    These can be field configured or overridden using the CtAmpsACtAmpsB, and CtAmpsC objects.

See Also

AC Power Measurement
for BACnet Networks,
True Power, kWh
Reactive Power,
VARs, Power Factor,
Individual Phase Measurements

ModelVAC Phase
to Neutral
VAC Phase
to Phase
Electrical
Service Types
Neutral
Required
WNC-3Y-400-BN 230 400 1 Phase 2 Wire 230V with neutral
3 Phase 4 Wire 230V/400V
Yes
WNC-3D-400-BN See Below 400 3-Phase 3-Wire Delta 400V (No neutral)
3-Phase 4-Wire Wye 230/400V
 
  • Delta models, WNB-3D-400-P, work either with or without a neutral connection, but require a line-to-line voltage connection for operating power.

 

WattNode BACnet

The WattNode BACnet (MS/TP) 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.

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 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.

Measurements

  • 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

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), producing 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, 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

Safety Note

Warning: Hazardous Voltages - Only qualified personnel or licensed electricians should install the WattNode meter and current transformers.


The WattNode® BACnet® meter is available with factory options at an additional charge. See the WattNode BACnet manual (pdf) for more information and details about the registers mentioned below.

General Options

  • Option CT=xxx/yyy/zzz - Pre-assign xxx to CtAmpsAyyy to CtAmpsB, and zzz to CtAmpsC.
    These can be field configured or overridden using the CtAmpsACtAmpsB, and CtAmpsC objects.

See Also

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)

Regulatory

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

WattNode-Case-Dimensions.png

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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