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UMG 512-PRO
12.3 Frequency measurement
For the measurement, the device requires the
mains frequency, which can either be specified
by the user or determined automatically by the
device.
·Automatic determination of the frequency
requires that a voltage (V-Vref) greater than
10 Vrms must be present on at least one of the
voltage measurement inputs.
·The mains frequency must be in the range from
15 Hz to 440 Hz.
·If the measured voltage is not sufficiently high,
the device cannot determine the mains frequen-
cy and therefore cannot carry out a measure-
ment.
12.4 Direction of rotary field
Check the direction of the voltage rotating field in
the measuring display of the device.
Usually it is a "right" rotating field.
UL1-UL2-UL3 = right rotating field
UL1-UL3-UL2 = left rotating field
Fig. Illustration of the phase sequence according to the
direction of the rotary field.
Summary of Contents for UMG 512-Pro
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