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UMG 509
Frequency measurement
The UMG 509 requires the mains frequency for
the measurement. The mains frequency can be defined
by the user or automatically determined by the device.
• For the UMG 509 to automatically determine
the frequency, a voltage (V-Vref) greater than 10Veff
must be applied to at least one of the voltage
measurement inputs.
• The mains frequency must be in the range from
40Hz to 70Hz.
• If there is no sufficiently high measured voltage
available, the UMG 509 cannot determine
the mains frequency and thus cannot perform any
measurements.
Direction of the rotating field
Check the direction of the rotating field voltage
in the measured value display of the UMG 509.
A “right” rotation field usually exists.
Presentation of the phase sequence according
to the direction of the rotating field.
UL1-UL2-UL3 = right rotation field
UL1-UL3-UL2 = left rotation field
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