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

Manufacturer:
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
i h

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
*
*
*

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