New - Advanced Pulse WattNode^®

Low-Cost kWH Transducer / Submeter Multi-Color Diagnostic LEDs Bidirectional Outputs Perfect for Net Metering

The Advanced Pulse Output WattNode® is a true RMS AC watt-hour transducer with pulse output (solid state relay closure) proportional to kWH consumed. The WattNode provides accurate measurement at low cost to meet your needs for sub-metering, net-metering, energy management, and performance contracting applications.

Easy installation saves you time and money. The WattNode is small enough to fit entirely within a standard electrical panel and the screw terminals unplug for easy wiring.

The complete Pulse Output family measures 1, 2, or 3 phases in 2, 3, or 4 wire configurations. With voltage ratings from 120 to 600 VAC and current transformer (CT) ratings from 5 to 6000 amps, there is a WattNode combination to meet your AC power measurement requirements.

Accuracy of the WattNode is 0.50% of reading over a wide range of power factor and harmonic content. The WattNode measures true RMS power even with leading or lagging power factor and chopped or distorted waveforms. This makes the WattNode ideas for monitoring motors and pumps controlled by variable speed drives.

Two Advanced Output Capabilities are available as factory options:

• Standard output provides pulses on one terminal for positive energy and on another terminal for negative energy. This is useful with solar panels, where energy taken from the grid and energy fed to the grid can be metered separately with one meter (net metering).
• Option P3 provides three separate pulse output streams, one pulse output channel per measurement phase, which can be used to monitor each phase of a three-phase circuit independently or to monitor three separate single-phase circuits with one WattNode.

Our diagnostic LEDs provide a per-phase indication of power (green flashing), negative power (red flashing), and advanced diagnostics (yellow flashing) to help troubleshoot connection problems, like swapped CTs, or excessive line voltage. See the User's Guide for a full description.

Our safe CTs, with integral burden resistors, produce a voltage proportional to the load current. At rated current the voltage is only 0.333 VAC. Split core CTs quickly install on existing wiring and solid core CTs can prevent tampering. Bus bar CTs are available in a variety of standard sizes, plus custom designs up to 10" x 10" (254mm x 254mm) and 6000A.

The optional LCD module remotely displays energy in WH, kWH, or MWH; or power in W or kW. To protect the kWH total you can disable the front panel reset button and use a wired remote reset. The eight digit panel mount display runs for four years on a single replaceable battery.

Key Features and Benefits

• Pulse output - Compatible with energy management systems and data loggers.
• Small size - Can be installed in existing service panels or junction boxes.
• Diagnostic LEDs – Confirms proper installation for all phases.
• Bidirectional metering – Net metering for PV (photovoltaic) solar and wind power generation with only one meter.
• Advanced metering design – Enables metering of variable frequency drives.
• Option P3 – Three single phase meters in one.
• Uses safe CTs - Integral burden resistor limits the output to low voltage.
• Line powered - No external supply required.
• Detachable terminal blocks - Easy to install and remove.
• UL, cUL Listed - Designed and tested for safety and use throughout North America.
• CE Mark – Can be installed throughout the EU.

SPECIFICATIONS

Electrical

• Line powered
• Operating Voltage Range: -20%, +15% of nominal
• Power Line Frequency: 50 or 60 Hz
• CT Input: 0.333 VAC nominal, 3 VAC maximum

Pulse Output

• Output waveform: square-wave, 50% duty cycle
• Optoisolator (phototransistor) output handles up to 60 VDC at 1μA (microamp) to 5mA (milliamp).
• Fully isolated to withstand 5000 volts

Frequencies at Full Scale Power

• Standard (All Models): 4.00 Hz
• Custom (Single Output and Bidirectional Output Models): 0.01 Hz to 600 Hz
• Custom (Per-Phase Output Models): 0.01 Hz to 150 Hz

Accuracy

• Accuracy: ±0.50% of reading
• Line voltage: 80% - 120% of nominal
• Power factor: 1.0
• Frequency: 48 - 62 Hz
• Ambient Temperature: 25°C
• Current: 1.5% - 100% of rated current

Regulatory

• FCC Class B, EN 55022 Class B
• UL and cUL Listed (UL 61010-1)
• CE Mark and RoHS (on WNB-3Y-400-P and WNB-3D-400-P models)
• Immunity: EN 61326: 2002 (Industrial Locations)

Environmental

• Operating Temperature: -30°C to +55°C (-22°F to 131°F)
• Humidity: 5 to 90% relative humidity (RH) up to 40°C, decreasing linearly to 50% RH at 55°C.

Mechanical  Click on the image for a larger view.

• Enclosure:
  • High impact, ABS plastic
  • Flame Resistance Rating: 94V-0, IEC FV-0
  • Size: 143mm × 85mm × 38mm (5.63" × 3.34" × 1.5")
  • Weight: 295gm (10.4oz)
• Connectors: Euroblock style pluggable terminal blocks
  • Green: 22 to 12 AWG (1.0mm - 3.2mm), 600 V
  • Black: 22 to 12 AWG (1.0mm - 3.2mm), 300 V

Optional LCD Display

• Display: Eight digits, each 0.43" high
• Units: Power in W or kW, Energy in WH, kWH or MWH
• Reset: Remote wire and configurable front panel button
• Enclosure: Panel mount box, 75mm x 40mm x 38.5mm (2.95" x 1.57" x 1.52")
• Battery: Lithium 2/3 A, replace every four years
• Backlit versions available
• See our LCD Display Page.

List prices for 1 piece quantities. Call for pricing on larger quantities. Effective February 1, 2007.

*WNB-3Y-400-P and WNB-3D-400-P models have CE Mark approval and are RoHS.

• The delta models, WNB-3D-xxx-P, can be used either with or without a neutral connection.
• For Option P3 or non-standard pulse frequencies (Option nnnHz), add $18.

Datasheet, Manuals and Application Notes

• Advanced Pulse Output WattNode - User's Guide (Acrobat PDF format)
• Advanced Pulse Output WattNode - Quick Install Guide (Acrobat PDF format)
• Advanced Pulse Output WattNode - Datasheet (Acrobat PDF format)
• See a list of Application Notes

©Copyright 2008 Continental Control Systems, LLC. All Rights Reserved.