E-W/dTransducer Energy Analyzer The Atto is a microprocessor based transducer / energy analyzer with outstanding flexibility and accuracy designed to meet the most demanding applications of electrical parameters analyses and energy supply monitoring in the residential, tertiary and industrial sectors. DC versions are available for direct current readings (e.g. photovoltaic and telecommunications systems). The Atto E-Wi has the same features of the Atto without inputs and outputs and in addition transmit and receive the data via radio waves, without limitations (wireless) using the E-Wi protocol based on the IEEE 802.15.4 standard. True-RMS and accurate measurements_ All the readings are “true-RMS” and they are obtained with a continuous sampling of the voltage and current waveforms in order to ensure the maximum metering accuracy of rapidly varying loads (e.g. spot welding). A sophisticated digital measurement method with a compensation system of the internal amplifiers' offsets ensure the maximum metering accuracy and stability irrespective of the signal level and the environmental working conditions. The 64 bit resolution allows an high detail of the energy value useful especially with small loads (e.g. devices in stand-by). The Atto is suitable for virtually all type of electrical grid, three phase 3- and 4-wire, symmetrical and asymmetrical, balanced or unbalanced, single- and bi-phase, Low Tension and High Tension, with 1, 2 or 3 CTs as well as for 2 and 4 quadrant (import/export) measurement. Via Energy Brain software (free or full version) it is possible to configure all the operational parameters such as grid type, LT/HT, CT and VT ratios (free setting) integration time (1-60 min), digital output and alarms (thresholds, delays, hysteresis), digital input, RS485 serial communication. Two LED on the frontal panel report the instrument status and the RS485 port activity. Parameter Type L1L2 L3 n Z P Range (1) (1) Absolute value (mean over10 cycles - example: 200ms at 50Hz). (2) Mean value (rolling average) over the integration time (1.. 60 min. programmable) (3) Import /Export mean value (rolling average) over the integration time (1.. 60 min. programmable). (4) Internal temperature of the microprocessor. (5) Import/Export energies displayed as 9 digits in floating-point readings; internal energy metering performed with 0,1 Wh minimum resolution and 99.999.999,9999 kWh maximum energy count before over. (6) Only for RS485 versions with digital inputs (not for E-Wi) Power Supply_ The Atto is equipped with a transformer power supply 230-240Vac. Other special versions on request: transformer type 115/120 Vac or 400Vac and switching type 15-36Vac/18-60Vdc and 9-24Vac/9-36

Transducer / Energy Analyzer Serial communication Digital outputs The Atto is equipped, as a standard feature on all versions, with an optoinsulated and over-voltage protected RS485 serial communication port. The protocol is a full compliant ModbusRTU suitable for communication with PLCs and with SCADA programs. The instrument data are read as numerical registers composed by mantissa and exponent in the IEEE format. A transmission speed of up to 38.400 bps, with maximum 125 registers (equivalent to 62 parameters) per query with no waiting time between queries, ensure an unrivalled communication...

the energy saving technology Transducer / Energy AnalyzerTechnical Specifications Functional characteristics Electrical characteristics Power Supply: Galvanic insulation: Power supply (separate):.. Measurement system: - True-RMS measurement up to the 31st harmonic - 2 and 4 quadrant measurement (programmable) - Continuous sampling of voltage and current waveforms (64 sampling per period, with PLL) - Automatic compensation of the offset RS485 serial port (Galvanically insulated): - Built-in over-voltage protection - Modbus-RTU protocol, full compliant Digital Input (depending on type): - Galvanically...

Transducer / Energy Analyzer Standards For the other versions of Atto RS485 Subject to modification without prior notice Data sheet Atto and Atto E-Wi 2015 11 12-ENG Electrex is a brand of Akse srl Via Aldo Moro, 39 - 42124 Reggio Emilia (RE) - Italy Tel : +39 0522 924244 - Fax : +39 0522 924245 www.electrex.it - email: [email protected]