AC Power Measurement
for BACnet Networks,
True Power, kWh
VARs, Power Factor,
Individual Phase Measurements
||1 Phase 2 Wire 230V with neutral
3 Phase 4 Wire 230V/400V
||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.
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.
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)
- Peak Demand
- 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
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.
- Option CT=xxx/yyy/zzz - Pre-assign xxx to CtAmpsA, yyy to CtAmpsB, and zzz to CtAmpsC.
- These can be field configured or overridden using the CtAmpsA, CtAmpsB, and CtAmpsC objects.