Table 265: Analog inputs
Input Description
I3P1
1
Three-phase currents
I3P2
1
Three-phase currents
I3P3
1
Three-phase currents
I3P4
1
Three-phase currents
IRES1
1
Residual current (measured or calculated)
IRES2
1
Residual current (measured or calculated)
IRES3
1
Residual current (measured or calculated)
IRES4
1
Residual current (measured or calculated)
See the preprocessing function blocks in this document for the possible
signal sources. The GRPOFF signal is available in the function block called
Protection.
3.20.17.5 Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are "on" and "off".
For this function, the setting is hidden and fixed to "on".
The switch logic depends on inputs SWITCH_TO2, SWITCH_TO3 and SWITCH_TO4.
Source 1 is selected as default and switching is done on increased priority.
GRPOFF signal must be connected to unused current inputs. GRPOFF
signal is available as output from the Protection function block.
Table 266: Switching operation
Control input signals Outputs
SWITCH_TO
2
SWITCH_TO
3
SWITCH_TO
4
SOURCE1 SOURCE2 SOURCE3 SOURCE4 Source for
I3P
Source for
IRES
FALSE FALSE FALSE TRUE FALSE FALSE FALSE I3P1 IRES1
TRUE FALSE FALSE FALSE TRUE FALSE FALSE I3P2 IRES2
x
1
TRUE FALSE FALSE FALSE TRUE FALSE I3P3 IRES3
x
1
x
1
TRUE FALSE FALSE FALSE TRUE I3P4 IRES4
If the numbers of channels connected to I3P1...I3P4 and IRES1...IRES4
does not match with the number of connected SWITCH_TOx inputs, the
configuration of the function fails.
Outputs ALARM and IRES_ALARM indicate bad quality data of system measurements
for selected I3P and IRES, respectively.
Outputs WARNING and IRES_WARNING indicate questionable quality data of system
measurements for selected I3P and IRES, respectively.
1
Can be connected to GRPOFF
1
No difference
1MRS759142 F Basic functions
REX640
Technical Manual
279
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