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The system-ready SGM-C4 three-phase meter is a standard device for measuring active power with residential and commercial customers and can be used as a modern metering system. The meter has an integrated RS-485 interface for system connection. Designed as a compact unit, it fulfills the functional requirements of the FNN industry standard. The SGM-C4 can be connected directly for both power directions (consumption and delivery) and is also available as a dual-tariff meter with external control.
With the LMN-BAB adapter connected externally to the RS-485 interface, the SCM-C4 can be upgraded to a smart metering system.
The SGM-C4 is a sturdy standard device with the following features:
The daily, weekly, monthly and annual values of active power over a period of two years are recorded in the ring buffer as historical data and displayed under PIN protection. The front optical interface is used for local provision of measurement data and device information according to SML/COSEM at 1-second intervals. This function is also PIN protected. PIN entry is via the front-side button or optionally via the optical button.
The RS-485 interface serves for system communication with a baud rate of 9.6 kbit/s. The protocols employed are SML/COSEM in the application layer.
In accordance with statutory provisions, the meter acts as a reliable and secure metering device for acquisition of billing-related active power quantities and grid-friendly measurement data and parameters, such as effective values of line voltage and current, power, phase angle and line frequency.
Active power is measured in both directions, with the following measurement modes being available:
The current sensors used are sturdily mounted, precise shunts suitable for accuracy class B.
Actual power values on all lines are logged internally and available over the data interfaces. The measurement mode can be set in the factory according to metering requirements.
The meter provides the following grid functions:
As an option, the dual-tariff function with external control is available via terminals 13 and 15. The tariff registers in both power directions together with the current tariff are shown on the display. Removing the terminal cover is detected as tampering and logged.
Modern metering device
In the 5(60)A / 5(100)A, MID Class A/B versions, the meter can be used as a stand-alone device (modern metering device) in all customer installations directly connected via two lines. Typical application areas include residential customers, customers with self-generation and feed-in into the public power grid, multi-unit dwellings, small commercial operations and site facilities.
Smart metering system
In combination with the secure gateway via the LMN-BAB adapter, the SGM-C4 forms a smart metering system as legally prescribed for customer installations with annual consumption greater than 6,000 kWh and installations with feed-in into the public power grid as described by the German Renewable Energy Resources Act (EEG). The Smart Grid meter provides the measurement data required for these grid-friendly tasks.
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