janitza UMG 96 RM-PN, User Manual, Page: 59 / 128

59
UMG 96RM-PN
Mains frequency (addr. 034)
To automatically determine the mains frequency, a
voltage L1-N of greater than 10Veff must be applied to
voltage measurement input V1.
The sampling rate for the current and voltage inputs is
then calculated from the mains frequency.
If the measured voltage is absent, it is not possible to
determine the mains frequency, which makes it impossible
to calculate the sampling rate. The acknowledgeable
error message "500" appears.
Voltage, current, and all other values derived from these
are calculated and still displayed based on the last
frequency measurement or on possible line interfaces.
However, these determined measured values are no
longer subject to the specified level of accuracy.
Once the frequency can be measured again, the error
message disappears automatically approx. 5 seconds
after the voltage returns.
The error is not displayed if a fixed frequency is set.
Setting range: 0, 45 - 65
0 = Frequency determined automatically
The mains frequency is determined from the measured
voltage.
45 - 65 = Fixed frequency
The mains frequency is preset to a fixed value.