Schweitzer Engineering Laboratories SEL-421-4, Instruction Manual

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4.12
SEL-400 Series Relays Instruction Manual Date Code 20171006
Front-Panel Operations
Front-Panel Layout
If you enter a Relay Word bit or Analog Quantity that does not match a valid
relay element, the relay displays:
Invalid element
. If you enter a display point
that exceeds the allowable length, the relay displays:
Too many characters
. If
you enter an invalid scale factor, invalid width, too many parameters, or omit nec-
essary quotation marks or brackets, the relay displays an error message. If a dis-
play point was used previously and you want to remove the display point, you
can delete the display point. In the Front Panel settings (SET F), at the Display
Points and Aliases prompt, use the text-edit mode line editing commands to set
the display points (see
Text-Edit Mode Line Editing on page 3.22 for information
on text-edit mode line editing). To delete Display Point 1, type DELETE
<Enter> at the Front Panel settings Line 1 prompt.
50P1,,,Overcurrent Empty Line
Overcurrent
MWHAIN,“A Ph Import={7.2}” A Ph Import=1234.56
MWHAIN,“A Ph Import={7.3}” A Ph Import=$$$.$$$
MWHAIN,“A Ph Imp {4}MWh” A Ph Imp 1234MWh
PAD,“{7.2}” 1234.56
PAD,“A Ph Dem Pwr={4.1}” A Ph Dem Pwr=1234.5
ICD,“C Demand={5}” C Demand= 1230
ICD,“C Demand={4.2,0.001} kA” C Demand=1.23 kA
MWHAOUT,“A Phase Out={3, 1000}” A Phase Out=1234
MWHAOUT,“A Phase Out={3, 1000} kWH” A Phase Out=$$$ kWh
1,“Fixed Text” Fixed Text
0,“Fixed Text” Fixed Text
1, Empty Line
0, Empty Line
Display Point is hidden
Example 4.2 Creating a Display Point
Display points screens can be used to provide operator feedback about the
readiness of equipment connected to the relay. A display points screen con-
tains 11 display points; this example demonstrates a method to set the dis-
play point messages that are shown in
Figure 4.12 . This example uses an
SEL-451 with an additional I/O interface board.
This example is based on a three-pole circuit breaker. Relay Word bit 52AA1
will assert when Circuit Breaker 1 is in the closed position.
IN109 will assert when Circuit Breaker 1 is in an alarm condition. B2IAFIM
is the filtered instantaneous magnitude for the A-Phase current through
Circuit Breaker 2.
In the Front Panel settings ( SET F ), enter the following after the Display
Points and Aliases Line 1 prompt:
1: 1,“Circuit Breaker 1”
2: 52AA1,,“ --Closed--”,“ --Open--”
Table 4.5 Display Point Settings—Boolean and Analog Examples (Sheet 2 of 2)
Example Display Point Setting Value Example Display