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Functional description
The three phase electronic measuring system
detects and digitizes the true rms values of al-
ternating voltage and current in 50/60Hz net-
works.
The operating voltage of the UMG96S is taken
from the measuring voltage L1-N, L2-N and L3-
N. Devices for the measurement in 230V/400V
networks, at least one phase must be within the
rated range. Instruments for measurement in
58V/100V or 63V/110V networks, at least two
phases must be within the rated voltage range.
Either .../5A or .../1A transformers can be con-
nected to the current inputs. In networks with
150VAC against ground, currents up to 5A can
be connected directly to the UMG96S.
Each second, one sample measurement is car-
ried out at all current and voltage inputs. Volt-
age interruptions longer than one second are
safely recognized. For each sample, 6 periods
are scanned. From these values, the inserted
microprocessor calculates the electrical quanti-
ties. The measured values can be indicated in
the measured value displays. The energy and
minimum and maximum values as well as the
programming data are stored every 5 minutes
in a none volatile memory (EEPROM).
The scanning frequency for all measuring inputs
is calculated from the net frequency of phase
L1. For a net frequency of 50Hz, the scanning
frequency is 2.5kHz and for a net frequency of
60Hz, the scanning frequency is 3.0kHz. If
voltage in L1 is smaller than 50V, the UMG96S
uses the last measured net frequency for the
calculation of the scanning frequency.
Diagr. Generation of the operating voltage, 300V
standard version.
UMG96S
Generation of
operating voltage
L2
L3
N
L1
PE
Voltage measurement
4
M
4
M
4
M
4
M
Diagr. Generation of the operating voltage, 150V
special version.
UMG96S
Generation of
operating voltage
L2
L3
N
L1
PE
Voltage measurement
4
M
4
M
4
M
4
M
Содержание UMG 96S
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