User Manual i4MC&V/EN M/C
iSTAT i4MC&V
Page 16
All of the sett
ings in this section should be defined before the settings for the analogue and
alarm outputs, as changes to this section may automatically change the measurements and
output settings
FIGURE 3-2: CONNECTION
3.5.1 Setting of current or voltage ratios
The details of the application must be known to define these settings; all other
measurements depend on them. Values with up to 5 numerical digits and a maximum of 3
decimal places can be input.
Settings range VT primary VT secondary CT primary CT secondary
Maximum value 1638,3 kV 13383 V 1638,3 kA 13383 A
Minimum value 0,1 V 1 mV 0,1 A 1 mA
3.5.2 Used Voltage or Current Range
The setting of this range is connected with the setting of the analogue output. Using a value
that matches the expected measurement range (with overload) will achieve the highest
quality of measurements.
If the ‘Used’ ranges are changed after the analogue settings have been defined, then the
analogue settings will be modified automatically, as defined below. It may be necessary to
modify the settings for the analogue output.
The ‘Used’ ranges are used to set the default scaling for the analogue output, which can be
subsequently changed to meet the application requirements. Internally the analogue
settings are also stored as a percentage of the ‘Used’ ranges. If the ‘Used’ ranges are
subsequently changed the analogue output settings will be correspondingly changed to
maintain the settings as the same percentage of the ‘Used’ range.
3.5.3 Nominal Frequency
A valid frequency measurement is within ± 32Hz of the nominal frequency. This setting is
only used for alarms.
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