8.1.8.3 Functionality
The frequency measurement range is 35...75 Hz. The estimated frequencies outside
the measurement range are considered to be out of range and the minimum and
maximum values are then shown.
When the frequencies cannot be measured, for example, due to too low voltage
amplitude, the default value for frequency measurement can be selected with the
Def frequency Sel
setting parameter. In the “Nominal” mode the frequency is set
to 50 Hz (or 60 Hz) and in “Zero” mode the frequency is set to zero and shown in
parentheses.
8.1.8.4 Signals
FMMXU Input signals
Table 614: FMMXU Input signals
Name Type Default Description
F SIGNAL - Measured system fre-
quency
8.1.8.5 Settings
FMMXU Non group settings
Table 615: FMMXU Non group settings (Basic)
Parameter Values (Range) Unit Step Default Description
Operation
1=on
5=off
1=on Operation Off / On
F high high limit 35.00...75.00 Hz 1 60.00 High alarm fre-
quency limit
F high limit 35.00...75.00 Hz 1 55.00 High warning fre-
quency limit
F low limit 35.00...75.00 Hz 1 45.00 Low warning fre-
quency limit
F low low limit 35.00...75.00 Hz 1 40.00 Low alarm frequen-
cy limit
F deadband 100...100000 1 1000 Deadband configu-
ration value for in-
tegral calculation
(percentage of dif-
ference between
min and max as
0,001 % s)
Table 616: FMMXU Non group settings (Advanced)
Parameter Values (Range) Unit Step Default Description
Def frequency Sel
1=Nominal
2=Zero
1=Nominal Default frequency
selection
1MRS758755 C Measurement functions
REC615 & RER615
Technical Manual
593
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