8.1.10.3 Functionality
The frequency measurement range is 35...75 Hz. The measured frequencies outside
the measurement range are considered to be out of range and the minimum and
maximum values are then shown in parentheses.
There is an extended range of 10...75 Hz in a 50 Hz network and 12...75 Hz in a 60 Hz
network. The measured frequencies outside 35...75 Hz are shown in parentheses.
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.
FMMXU provides instantaneous frequency in hertz which is available for application
configurations through output F_INST.
8.1.10.4 Signals
FMMXU Input signals
Table 1408: FMMXU Input signals
Name Type Default Description
U3P SIGNAL - Three-phase voltages
FMMXU Output signals
Table 1409: FMMXU Output signals
Name Type Description
F_INST FLOAT32 Frequency, instantaneous val-
ue
8.1.10.5 FMMXU Settings
Table 1410: 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 0.01 60.00 High alarm fre-
quency limit
F high limit 35.00...75.00 Hz 0.01 55.00 High warning fre-
quency limit
F low limit 35.00...75.00 Hz 0.01 45.00 Low warning fre-
quency limit
F low low limit 35.00...75.00 Hz 0.01 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
1MRS759142 F Measurement functions
REX640
Technical Manual
1469
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