ABB RELION REX640 Technical Manual page 1469

1MRS759142 F
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
U3P
FMMXU Output signals
Table 1409: FMMXU Output signals
Name
F_INST
8.1.10.5 FMMXU Settings
Table 1410: FMMXU Non group settings (Basic)
Parameter Values (Range)
Operation
1=on
5=off
F high high limit 35.00...75.00
F high limit 35.00...75.00
F low limit 35.00...75.00
F low low limit 35.00...75.00
F deadband 100...100000
REX640
Technical Manual
Type
SIGNAL
Type
FLOAT32
Unit Step
Hz 0.01
Hz 0.01
Hz 0.01
Hz 0.01
1
Measurement functions
Default Description
- Three-phase voltages
Description
Frequency, instantaneous val-
ue
Default
1=on
60.00
55.00
45.00
40.00
1000
Description
Operation Off / On
High alarm fre-
quency limit
High warning fre-
quency limit
Low warning fre-
quency limit
Low alarm frequen-
cy limit
Deadband configu-
ration value for in-
tegral calculation
(percentage of dif-
ference between
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