Landis+Gyr E650 Series User Manual page 12

12/84
Outputs
Measuring system
Signal processing
Signal utilisation
© Landis+Gyr

Pulse inputs for connection of external pulse transmitters (only for
meters equipped with a communication unit)
The meter has the following outputs:

LCD display with buttons for local reading of billing data (single 8-digit
display with additional information, such as energy direction, energy
type, presence of phase voltages and identification number)

Optical test outputs (red, 1 in active energy meters, 2 in combi-meters)

Optional alert LED (red) to indicate alerts on the front face of the meter

Static relay with freely parameterised signal assignment (2 fixed, plus
up to 6 others on the extension board)

Relay outputs with limited parameterised signal assignment due to
limited life expectancy (up to 2 on the extension board)

Optical interface for automatic local data acquisition by a suitable
acquisition unit (handheld terminal)

Communication interfaces of various kinds in the communication unit
(also see section 2.7 "Communication" )
The input circuits (voltage dividers and current shunts with voltage trans-
former) record voltage and current in the individual phases. Analogue-
digital converters digitise these values and feed them as instantaneous
digital values via calibration stages to a signal processor.
The signal processor determines the following measured quantities from
the instantaneous digital values of voltage and current for each phase and
forms their mean value over one second:

Active power per phase

Reactive power per phase (combi-meters ZMD300CT only)

Phase voltages

Phase currents

Network (mains) frequency

Phase angles
For signal utilisation in the various registers, the microprocessor scans the
measured quantities every second to determine the following values:

Active energy (sum and individual phases, separated according to
energy direction, if required in the combi-meters ZMD300CT also
assigned to the 4 quadrants)

Reactive energy (only for combi-meters ZMD300CT, sum and
individual phases, separated according to energy direction, assigned
to the 4 quadrants)

Apparent energy (only for combi-meters ZMD300CT, sum and
individual phases, separated according to energy direction)

Power factor cosφ (only for combi-meters ZMD300CT, individual
phases and mean value)

Phase voltages

Phase currents and neutral current
D000030108 en m – E650 Series 3 – ZMD300AT/CT – User Manual
Device description