janitza UMG 96 RM-M, User Manual And Technical Data, Page: 45 / 112

45
UMG 96RM-M
Mains frequency (addr. 034)
For automatic ascertainment of the mains frequency, an
L1-N voltage larger than 10Veff must be applied to the
voltage measurement input V1.
The mains frequency is then used to calculate the
sampling rate for the current and voltage inputs.
If there is no measurement voltage, the mains frequency
cannot be determined and thus no sampling rate can be
calculated. The acknowledgeable error message “500”
appears.
The voltage, current and all other resulting values
are calculated based on the previous frequency
measurement and possible cable-connecting sockets
and continue to be displayed. However, these derived
measured values are no longer subject to the specified
accuracy.
If it is possible to re-measure the frequency, then the
error message will disappear automatically after a
period of approx. 5 seconds once the voltage has been
restored.
The error is not displayed if a fixed frequency has been
configured.
Adjustment range: 0, 45 .. 65
0 = automatic frequency determination.
The mains frequency is determined from
the measurement voltage.
45..65 = fixed frequency
The mains frequency is preselected.