Schweitzer Engineering Laboratories SEL-751 - Figure 4.122 Adding Temperature Measurement Display Points; Figure 4.123 Rotating Display

4.201
Date Code 20170927 Instruction Manual SEL-751 Relay
Protection and Logic Functions
Front-Panel Settings (SET F Command)
we have installed an analog card in relay Slot C, and connected 4–20 mA
transducers inputs to analog inputs AI301 (hot-spot temperature), AI302 (oil
temperature), and AI303 (winding temperature).
First enable enough display points for the analog measurements (e.g.
EDP = 5). Figure 4.122 shows the settings to add the three transducer
measurements. (Use the > character to move to the next settings category).
Rotating Display
With more than two display points enabled, the relay scrolls through all
enabled display points, thereby forming a rotating display, as shown in
Figure 4.123.
Figure 4.123 Rotating Display
To change the temperature units to more descriptive engineering units, enter
the desired units with the AIxxxEU (e.g., AI302EU) setting.
Local Bits
Local bits are variables (LBnn, where nn means 01 through 32) that are
controlled from front-panel pushbuttons. Use local bits to replace traditional
panel switches. The state of the local bits is stored in nonvolatile memory
every second. When power to the device is restored, the local bits return to
their states after the device initialization. Each local bit requires three of the
=>>SET F TERSE <Enter>
Front Panel
General Settings
DISPLY PTS ENABL (N,1-32) EDP := 4 ? 5 <Enter>
LOCAL BITS ENABL (N,1-32) ELB := 1 ? > <Enter>
•
•
•
Display Point Settings (maximum 60 characters):
(Boolean): Relay Word Bit Name, "Alias", "Set String", "Clear String"
(Analog) : Analog Quantity Name, "User Text and Formatting"
DISPLAY POINT DP01 (60 characters)
DP01 := IN101,"TRFR 1 HV BRKR:",CLOSED,OPEN
? <Enter>
DISPLAY POINT DP02 (60 characters)
DP02 := IN102,"TRFR 1 LV BRKR:",CLOSED,OPEN
? <Enter>
DISPLAY POINT DP03 (60 characters)
DP03 := IAV, "IAV CURR {5} A"
? AI301,"HOT SPOT TEMP" <Enter>
DISPLAY POINT DP04 (60 characters)
DP04 := IG_MAG, "GND CURR {5} %"
? AI302,"OIL TEMPERATURE" <Enter>
DISPLAY POINT DP05 (60 characters)
DP05 := IA_MAG, "IA {7.1} A pri"
? AI303,"WINDING TEMP" <Enter>
Save changes (Y,N)? Y <Enter>
Settings Saved
=>>
Figure 4.122 Adding Temperature Measurement Display Points
TRFR 1 HV BRKR:=
TRFR 1 LV BRKR:=
Screen 1
HOT SPOT TEMP
xxx.xx degrees C
Screen 2
OIL TEMPERATURE
0.031 mA
Screen 3
WINDING TEMP
0.037 mA
Screen 4
TRFR 1 HV BRKR:=
TRFR 1 LV BRKR:=
Screen 1