4.89
Date Code 20081022 Instruction Manual SEL-787 Relay
Protection and Logic Functions
Global Settings (SET G Command)
Analog Outputs
If an SEL-787 configuration includes the four analog inputs and four analog
outputs (4 AI/4 AO) card, the analog outputs are allocated to output numbers
1-4. Figure 4.57 shows the x and y variable allocation for the analog output
card.
Figure 4.57 Analog Output Number Allocation
For an analog input/output card in Slot 3, setting AO301AQ identifies the
analog quantity we assign to Analog Output 1 (when set to OFF, the device
hides all associated AOx0y settings and no value appears on the output). You
can assign any of the analog quantities listed in Appendix K: Analog
Quantities.
Table 4.38 shows the setting prompt, setting range, and factory default settings
for an analog card in Slot 3.
In this example, assume we want to display the transformer temperature
measurement from Analog Input AI301 (relabeled TX_TEMP) on an
instrument in the station control room that operates on 4–20 mA. We install an
analog output card in Slot C, and set the card as shown in Figure 4.58.
Table 4.38 Output Setting for a Card in Slot 3
Setting Prompt Setting Range
Setting Name :=
Factory Defa ul t
AO301 ANALOG QTY Off, 1 analog quantity AO301AQ := OFF
AO301 TYPE I, V AO301TYP := I
AO301 AQTY LO –2147483647.000 to
+2147483647.000
AO301AQL := 4.000
AO301 AQTY HI –2147483647.000 to
+2147483647.000
AO301AQH := 20.000
AO301 LO OUT VAL –20.480 to +20.480 mA AO301L := 4.000
AO301 HI OUT VAL –20.480 to +20.480 mA AO301H := 20.000
AO301 LO OUT VAL –10.240 to +10.240 V AO301L := 0.000
a
a
Voltage setting range for a voltage transducer, i.e., when AO301TYP := V.
AO301 HI OUT VAL –10.240 to +10.240 V AO301H := 10.000
a
Output Number (1 through 4)
Slot Position (3 through 5)
Analo
Out
ut
Ox0y
NOTE: The SEL-787 hides the
following settings with default values
when you use a 3 DI/4 DO/1 AO card:
AOxx1TYP := I
AOxx1L := 4.000
AOxx1H := 20.000
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