Modbus Poll Notes

Modbus Poll is a full-featured Modbus® master program that can be used to monitor, configure, and test WattNode® Modbus meters. This article provides some pointers on using Modbus Poll successfully with the WattNode. Saving Register Blocks Before anything else, it is important to learn to save register block configurations, so that you do not have […]

Why Are Some Settings Locked on Revenue Meters?

Why Are Some Settings Locked on Revenue Meters? On WattNode® Revenue meters (BACnet®, Modbus®, and LonWorks®), the meter prevents writes to all configuration settings that could affect the reported results. This helps ensure the revenue grade accuracy when the meter is installed correctly and is in a physically secure location. If the meter allowed configuration […]

WattNode Voltage Ranges and Power Supply

Operating Voltage Ranges and Power Supply WattNode® electric meters are available in seven different voltage range models. Each model handles different electrical service types and voltages, so you must be sure to choose a WattNode model that matches the service voltages you are measuring. All current WattNode models have either "3D" or "3Y" in the [...]

Current Transformers (CTs) Explained

Current Transformers (CTs) Explained Overview Current Transformers (CTs) measure the amount of electric current flowing in a conductor. A WattNode® meter, which also measures voltage, uses current and voltage measurements to calculate power and energy (kW and kWh). CCS only sells "safe", low-voltage outputs CTs. This type of CT is calibrated to output exactly 0.333 [...]

Measuring Parallel Conductors

Measuring Parallel Conductors Overview Parallel conductors are commonly used for 400 amp and larger circuits (feeders) and utility services. Two or more sets of phase conductors are installed in separate conduits and electrically joined at both ends to form the equivalent a single conductor with a larger ampacity rating. Multiple parallel conductors dissipate heat better […]

Paralleling Current Transformers

Paralleling Current Transformers This page discusses the issues of using current transformers (CTs) in parallel. This is useful for the following: Circuits with multiple conductors (common on high current circuits): Measuring Parallel Conductors. To add the power and energy readings of multiple branch circuits and measure them with one WattNode. When paralleling CTs, the effective […]