Continental Control Systems introduces WattNode Wide-Range Modbus meter

April 12, 2019 - Continental Control Systems introduces the WattNode Wide-Range Modbus meter with several features, including a single meter model for services from 100 to 600 Vac, remote correction of the current transformer (CT) polarity and phase, ANSI C12.20 class 0.5 accuracy, a 100-millisecond update rate, and the ability to detect disconnected CTs.

The versatile power supply replaces seven models with one model. The model operates from 85 Vac to 690 Vac on wye, delta, single-phase, and three-phase services

Two CTs can be used instead of three CTs for delta circuits, and one CT can be used instead of two CTs for two-wire single-phase circuits. If CT wiring is incorrect, it can be fixed in software remotely after installation. A CT with wiring that is backward can have polarity corrected. A CT that is on the wrong phase can be changed virtually to the correct phase. These settings use the WattNode’s ability to associate any of its CT inputs with any of its voltage inputs.

In response to customer demand the WattNode’s FAST POWER feature measures and reports power, voltage, frequency, and current every 100 milliseconds for power export limiting and control applications. To support tamper requirements, the WattNode can detect if a CT is disconnected. The WattNode supports potential transformers (PT) for services up to 36 kV and scales measurements based on the PT ratio.

The WattNode Wide-Range Modbus uses the Modbus RTU protocol over RS-485 at up to 115,200 baud. It supports millivolt (0.333 Vac) output CTs, flexible Rogowski coils, and has optional support for milliamp output CTs. It is available in UL 508A NEMA 4 steel or polycarbonate enclosures with optional fuses or circuit breakers.