8.5
Date Code 20130214 Instruction Manual SEL-2414 Transformer Monitor
Front-Panel Operations
Human-Machine Interface
Rotating Display
With more than two display points enabled, the device scrolls through all enabled
display points, thereby forming a rotating display, as shown in Figure 8.9.
Local Bits
Local bits are variables (LBnn, where nn means LB01 through LB32) that are
controlled from front-panel pushbuttons. Use local bits to replace traditional
panel switches. Each local bit requires three of the following four settings, using
a maximum of 14 valid characters for the NLBnn setting, and a maximum seven
valid characters (0–9, A–Z, -, /, ., space) for the remainder:
➤ NLBnn: Name the switch (normally the function that the switch
performs, such as SWITCH) that will appear on the LCD display.
➤ CLBnn: Clear local bit. Enter the text that describes the intended
operation of the switch (this text appears on the display) when
LBnn deasserts (OPEN, for example).
➤ *SLBnn: Set local bit. Enter the text that describes the intended
operation of the switch (this text appears on the display) when
LBnn asserts (CLOSE, for example).
➤ *PLBnn: Pulse local bit. When selecting the pulse operation,
LBnn asserts for only one processing interval before deasserting
again. Enter the text that describes the intended operation when
LBnn asserts (START, for example).
➤ *Omit either SLBnn or PLBnn (never CLBnn) by setting the
omitted setting to NA. If SLBnn and PLBnn are both set then
PLBnn is ignored.
For the transformer in our example, configure two local bits: one to replace a
supervisory switch, and the other to start a fan motor. Local bit 1 replaces a
supervisory switch (SWITCH) and we use the clear/set combination. Local bit 2
starts a fan motor (START) that only needs a short pulse to seal itself in, and we
use the clear/pulse combination.
Figure 8.9 Rotating Display
TRFR 1 HV BRKR:=
TRFR 1 LV BRKR:=
Screen 1
HOT SPOT TEMP
0.024 mA
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
To Next Page
Loading...
