Datasheet

AC Power Measurement for Modbus Networks
The WattNode Modbus is a bidirectional networked energy meter offering energy measurement parameters such as energy (kW),
power (kWh), voltage, current, demand, kVAR, kVARh, power factor, line frequency, etc. These energy values are communicated
using the Modbus RTU communication protocol over RS-485 as individual phase measurements and sum or average readings.
In a Modbus network, there is one master device and up to 247 slaves, each with a unique slave address from 1 to 247. Address-
es from 1 to 127 can be set on the front panel DIP switch. Addresses from 1 to 247 can be set by writing to the address register in
the meter. Up to 247 WattNode Modbus meters can be daisy-chained on one RS-485 subnet.
The WattNode Modbus is available in standard and revenue-grade accuracy and can be used with any low voltage CT (0.333
Vac output). Revenue-grade system accuracy requires current transformers with Class 0.6 or better accuracy. The ACTL series
of current transformers is available with Class 0.6 or Class 0.3 accuracy; these CTs are ideal for revenue-grade use for billing
purposes, SREC and state revenue-grade requirements. Certicates of calibration are available for the WattNode Revenue
meters and the ACTL revenue-grade transformers.
The WattNode Modbus’ compact size permits installation inside most electrical service panels, junction boxes and OEM equip-
ment. The WattNode Modbus is line-powered and therefore requires no separate power source. Diagnostic LEDs help ensure fast
and correct installation as well as network communication.
The WattNode Modbus family of energy meters measure 1, 2, or 3 phases in 2, 3, or 4 wire congurations, 120 to 600 Vac, 50 to
60 Hz. CCS offers a complete line of low-voltage, solid and spilt-core current transformers for 5 to 6000 amps loads.
Features
• Modbus RTU protocol (binary)
communication
• 100+ integer and oating-point
(decimal numbers) registers
• 50+ measurements (watts, kWh,
volts, amps, PF, demand, etc.)
• Supports 127 DIP switch
selectable addresses
• Line powered
• Small prole, easy installation
• 5 year warranty
Standard and Revenue-Grade
WNMB-11.20.17: Specications are subject to change
2150 Miller Drive, Suite A • Longmont CO 80501 • USA
[e-mail] • www.ctlsys.com
[phone] • Fax [phone]
WATTNODE
®
MODBUS
Models
Model Number Model Number
VAC
Line to Neutral
VAC
Line to Line
Phases Wires
WNC-3Y-208-MB RWNC-3Y-208-MB 120 208-240 3 4
WNC-3Y-400-MB RWNC-3Y-400-MB 230 400 3 4
WNC-3Y-480-MB RWNC-3Y-480-MB 277 480 3 4
WNC-3Y-600-MB RWNC-3Y-600-MB 347 600 3 4
WNC-3D-240-MB RWNC-3D-240-MB 130 208-240 3 3-4
WNC-3D-400-MB RWNC-3D-400-MB 230 400 3 3-4
WNC-3D-480-MB RWNC-3D-480-MB 277 480 3 3-4
"R" Designates revenue-grade
WattNode and Accu-CT are registrered trademarks of Continental Control Systems, LLC.