Signal Processing - Landis+Gyr E350 Series User Manual

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2.6.3

Signal Processing

Calibration
Start detection
Measured quantities
Measurement
channels
Energy registers
Rates
Rate control
Summation by vectors
+A/–A
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The meter records active and reactive energy and can distinguish between
energy import and export in up to 6 rates (depending on configuration).
Calibration data is stored during the final testing of the meter.
The microprocessor compares the measured power with the minimum
starting power. The signals are only passed on for summation if the
minimum starting power is exceeded.
The following energy values can be measured and stored in the registers:

Active energy A

Reactive energy R

Apparent energy S
The signals +A and +R are formed by summation for imported measured
active and reactive energy. The signals –A and –R are formed by
summation for exported measured active and reactive energy. The
combined totals are the sum of the absolute values of +A and –A or +R and
–R.
Energy type:
Direction:
Source:
Instantaneous Values:
[M24...M28]
There are 10 (or 8
channels. One of the measured quantities can be assigned to each of this
register.
In firmware version M29, the measurement channels 1 to 6 have 6 rated
registers and 1 total each, channels 7 and 8 have 4 rated registers and 1
total each, channels 9 and 10 have only 1 total register. 54 registers are
therefore available in total.
In firmware version M27, the measurement channels 1 to 8 have 4 rated
registers and 1 total each, channel 9 and 10 have only 1 total register.
34 registers are therefore available in total.
All registers work internally with 9 digits. The internal magnitude is Wh
(Watt-Hours). They cannot be reset. At 999999999, a rollover to 0 takes
place. The display and readout formats vary from the internal format.
The meter is designed for up to 6 rates. The assignment of the rate
registers is done by means of parameterisation and is shown on the
faceplate.
Rate control is performed by the external module.
With up to 2 rates, the rate switching is operated by the communication
module directly or by control inputs. The rate switching for more than 2
rates can be operated only by the communication module.
Summation methods
Summation can take place in different ways:
"Ferraris mode":
As in Ferraris meters, the meter summates the values of the individual
phases taking the sign into account. With differing signs (energy directions)
kWh, kvarh or kvah
Import, export, ± reactive
Individual phase, summed, etc.
Voltage, current, frequency, power factor, etc.
[M21...M23]
or 6 ) independent measurement
D000027979 en t – E350 Series 2, 3-Phase ZxF100Ax/Cx – User Manual
Description of Unit