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35
7.4.1 Overvoltage
The voltage measurement inputs are designed
for measurements in low-voltage networks in
which nominal voltages occur as described in the
chapter „19. Technical data“ on page 96.
Information on the rated surge voltages and
overvoltage categories can also be found in the
technical data.
7.4.2 Mains frequency
The device:
·Requires the mains frequency for the
measurement and calculation of measured
values.
·Is suitable for measurement in networks in which
the fundamental oscillation of the voltage is in the
range from 40 Hz to 70 Hz.
·Requires a voltage L1-N of greater than 10 V
eff
for the automatic determination of the mains
frequency at the voltage measurement input V1.
·Calculates the sampling frequency of the voltage
and current measurement inputs from the mains
frequency.
INFORMATION
The device only determines measured values if a
voltage L1-N of greater than 10 V
eff
(4-conductor
measurement) or a voltage L1-L2 of greater than 18
V
eff
(3-conductor measurement) is applied to the
voltage measurement input V1.
Use line protection with IEC/UL approval (1 - 10 A,
tripping characteristic B) as an overcurrent
protective device for the voltage measurements.