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UMG 104
L
N
At least one phase (L) and the neutral conduc-
tor (N) must be connected to the voltage mea-
surement input for the measurement.
Applying the measuring-circuit
voltage
The UMG104 is suitable for the measurement
of voltages of up to 300 V AC to earth and
520 V AC conductor to conductor.
The UMG104 is not suitable for the
measurement of direct voltages. Voltages
above 300 VAC to earth must be connected
via voltage transformers.
After connecting the measurement-current
voltages, the measured values displayed by
the UMG104 for the L-N and L-L voltages
must correspond to those at the voltage
measurement input.
If a voltage transformer factor is programmed,
this must be taken into account in the
comparison.
Minimum voltage
A measuring-circuit voltage greater than
10 Veff must be applied to at least one
of the voltage measurement inputs. If an
adequately high measuring-circuit voltage
is not applied on the measuring input V1 the
UMG104 cannot determine exactly the system
frequency and can therefore also not take a
exactly measurement.
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