The WattNode® Module for Modbus® is a kilowatt hour (kWh) energy and power meter with ANSI C12.1 and ANSI C12.20 class 0.5 accuracy. Designed for easy customization for nearly any application or type of equipment, the WattNode Module provides bidirectional energy and power readings via an RS-485 port using Modbus RTU communications. The WND-M1-MB meter measures 1, 2, or 3 phases, in delta or wye services, from 120 to 600 Vac. It is packaged in a compact, DIN-rail mount enclosure. Current transformers are available in various opening sizes with ratings from 5 to 6,000 amps. The Module is instrument powered from 6-24 Vdc or from an isolated 12-24 Vac control transformer. The optional MDR-10-12 DIN Rail Power Supply can power up to 12 WND-M1-MB meters.

Measurements

• Supports floating-point and integer registers
• Active (real) power: watts, individual meter elements and sum of elements
• Reactive power: VARs, individual meter elements and sum of elements
• Power factor: individual meter elements and sum of elements
• Active (real) energy: kilowatt-hours (kWh), individual meter elements and sum of elements; net, positive, and negative
• Reactive energy: kVAR-hours, individual meter elements and sum of elements; net, positive, and negative
• AC line frequency (Hz)
• RMS voltage line-to-neutral: V_AN, V_BN, V_CN
• RMS voltage line-to-line: V_AB, V_BC, V_CA
• RMS current: CT1, CT2, CT3
• Demand: individual meter elements and sum of elements
• Peak demand sum: minimum and maximum
• Apparent power demand

Diagnostic LEDSs

Diagnostic LEDs provide a per-phase indication of line voltage and power (green flashing) and negative power (red flashing) to help troubleshoot connection problems, like reversed CTs. The WattNode Module for Modbus 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.

WattNode Module for MODBUS – Features

• Meets ANSI C12.1 and ANSI C12.20 Class 0.5 revenue metering standards
• 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
• Safe CT’s (Current Transformers), output 0.333 Vac at rated current.
  • Split core CTs for quick installation
  • Solid core CTs are less expensive and prevent tampering
  • CTBL large split-core CTs for high currents (standard and custom sizes)
  • CTRC Rogowski Coils for tight spaces where rigid CTs do not fit
• UL, cUL Listed – Designed and tested for safety and use throughout North America.
• Assembled in USA, qualified under the Buy American provision in the American Recovery and Reinvestment Act of 2009 (ARRA).
• Compact, DIN-rail mount design
• Instrument powered from 6-24 Vdc or a isolated 12-24 Vac sourc

Differences between the RWND and WND

• RWND comes with a calibration certificate
• RWND requires that you specify a revenue-grade CT model when ordering the meter. This will appear on the meter’s calibration certificate.
• Note: the CT amps are not locked on either model unless you order Option L.

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

Modbus is a registered trademark of Schneider Electric USA, Inc.

 

 

Model	VAC Line to Neutral	VAC Line to Line	Electrical Service Types	Neutral Required
WND-M1-MB	120-347	208-600	L-N Vac is 120-347 L-L is 208-600	No
RWND-M1-MB	120-347	208-600	L-N Vac is 120-347 L-L is 208-600	No

• Voltage Ranges listed in the table are -20% to +15% of nominal. Operating Frequencies: 50/60 Hz
• Works either with or without a neutral connection.
• Add 10% to the indicated price for any option or valid combination of options. For a list of available options see the Modbus Module Options tab.