Determine WattNode Firmware Version

Determine WattNode Firmware Version Overview There are cases when it is necessary to determine the WattNode® meter’s firmware version, commonly when handling technical support issues. The procedures vary from model to model and are listed below. WattNode BACnet Read device object property (Firmware Revision) to retrieve the firmware version. CCS can look up the calibration […]

Estimating Phase-to-Phase Voltages

Estimating Phase-to-Phase Voltages The energy measurement chip used in the WNB and WNC series WattNode® meters does not directly report the line-to-line (or phase-to-phase) voltage. These voltages can be estimated mathematically by the WattNode BACnet and Modbus meters by selecting the PhaseOffset parameter corresponding to type of electrical service being measured. Refer to the PhaseOffset […]

Monitoring Only One or Two of Three Phases

Monitoring Only One or Two of Three Phases Questions “Because of space constraints, we can only install two current transformers (CTs) to monitor a three-phase circuit. Is there a correction factor we can use to compensate for only monitoring two of the three phases?” “What if we only monitor one of the three phases?” Answer […]

Complete Metering Solutions

Complete Metering Solutions We need a complete metering solution; what do you recommend? There are different choices for our different families of WattNode® meters. WattNode Pulse WattNode Pulse meter combined with a CCS LCD display to report power and/or energy. See Advanced Pulse WattNode and LCD Display WattNode Pulse meter monitored by a third-party data […]

Option CT

Option CT Option CT is available for more than one product. Select the product you are interested in for details. WattNode Pulse – Option CT WattNode Modbus – Option CT WattNode for LonWorks – Option CT

Frequency Measurement Resolution

Frequency Measurement Resolution What is the frequency measurement resolution of the WattNode? The resolution is approximately one part in 250, but varies somewhat with the line frequency. So at 50 Hz, the resolution is 0.18 Hz, while at 60 Hz, the resolution is 0.26 Hz. WattNode Modbus (WNC Series) If you use the floating point […]

Reactive Power

Reactive Power Overview Reactive power (Q) is a term for the imaginary (non-real) power from inductive loads like motor or capacitive loads (less common). It is generally measured in units of VARs (volt-amps reactive). Sometimes reactive power is reported in units of watts; this isn't exactly correct, but not all devices or software offer units [...]

Mounting the WattNode in an Electrical Panel

Mounting the WattNode in an Electrical Panel Overview Customers sometimes ask about whether it is allowed to install / mount meters in breaker panels. Generally yes, but we need to compile a list of specific NEC rules detailing what is and is not allowed. NEC Articles 408 Switchboards and Panelboards To Be Determined What are […]

Does the WattNode Need Fuses

Fusing the WattNode Overview There must be an overcurrent protection device (circuit breaker or fuse) protecting each phase conductor connected to the WattNode® meter’s voltage input terminals (green, 5 circuit screw terminal block). However, in some cases, the circuit being monitored is already protected by fuses or circuit breakers and there is no need for […]

WattNode Input Impedances

WattNode Input Impedances Overview In rare cases, customers need the WattNode input impedances, sometimes to drive the WattNode from a potential transformer, sometimes for other reasons. Vac Inputs The WattNode Vac terminals (green connector) have an input impedance composed of two parts: the power supply load and the sense resistors. The power supply load appears […]