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UMG 511
Frequency measurement
The UMG511 needs the network frequency to
measure. The network frequency can be specifi ed
by the user or automatically determined by the
device.
• For automatic ascertainment of the frequency
using the UMG511, an L1-N voltage larger
than 10Veff must be applied to the voltage
measurement input V1.
• The network frequency must be in a range bet-
ween 15Hz and 440Hz.
• If a suffi ciently high measurement voltage is
not applied, the UMG511 cannot record the
network frequency and cannot carry out the
measurement.
Rotary fi eld direction
Check the direction of the voltage rotary fi eld in
the measurement value display of the UMG511.
A „right“ rotary fi eld usually exists.
Presentation of the phase series sequence accor-
ding to the rotary fi eld direction.
UL1-UL2-UL3 = right rotary fi eld
UL1-UL3-UL2 = left rotary fi eld
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