6.8
SEL-2414 Transformer Monitor Instruction Manual Date Code 20130214
Settings
Device Settings (SET Command)
perature, pressure, etc. Use the 16 available characters to assign descriptive
names for engineering units. Because we measure temperature in this example,
enter “degrees C” (without quotation marks) as engineering units. Enter –50 for
the lower level and 150 for the upper level.
With the levels defined, the next six settings provide two warning settings and
one alarm setting for low temperature values, as well as two warning settings and
one alarm setting for high temperature values. State the values in engineering
units, not the setting range of the transducer. Note the difference between low
warnings and alarm functions and high warnings and alarm functions: low warn-
ings and alarm functions assert when the measured value falls below the setting;
high warnings and alarm functions assert when the measured values rise above
the setting. In this example, we measure the oil temperature of a power trans-
former, and we want the following three actions to take place at three different
temperature values:
➤ At 65°C, start the cooling fans
➤ At 95°C, send an alarm
➤ At 105°C, trip the transformer
Because we are only interested in cases when the temperature values exceed their
respective temperature settings (high warnings and alarm functions), we do not
use the low warnings and alarm functions. Therefore, set the lower values
(AI301LW1, AI301LW2, AI301LAL) to OFF, and the three higher values as
shown in Figure 6.3. Set inputs connected to voltage driven transducers in a sim-
ilar way.
=>>SET AI301NAM TERSE <Enter>
Analog Input 301 Settings
AI301 Instrument Tag Name (8 characters 0-9,A-Z,_)
AI301NAM:= AI301
? TX_TEMP <Enter>
AI301 Type (I,V) AI301TYP:= I ? <Enter>
AI301 Low Input Value (-20.480 to 20.480 mA) AI301L := 4.000 ? <Enter>
AI301 High Input Value (-20.480 to 20.480 mA) AI301H := 20.000 ? <Enter>
AI301 Engineering Units (16 characters)
AI301EU := mA
? degrees C <Enter>
AI301 Engineering Unit Low (-99999.000 to 99999.000)
AI301EL := 4.000 ? -50 <Enter>
AI301 Engineering Unit High (-99999.000 to 99999.000)
AI301EH := 20.000 ? 150 <Enter>
AI301 Low Warn Level 1 (OFF,-99999.000 to 99999.000)
AI301LW1:= OFF ? <Enter>
AI301 Low Warn Level 2 (OFF,-99999.000 to 99999.000)
AI301LW2:= OFF ? <Enter>
AI301 Low Alarm (OFF,-99999.000 to 99999.000) AI301LAL:= OFF ? <Enter>
AI301 High Warn Level 1 (OFF,-99999.000 to 99999.000)
AI301HW1:= OFF ? 65 <Enter>
AI301 High Warn Level 2 (OFF,-99999.000 to 99999.000)
AI301HW2:= OFF ? 95 <Enter>
AI301 High Alarm (OFF,-99999.000 to 99999.000) AI301HAL:= OFF ? 105 <Enter>
Analog Input 402 Settings
AI302 Instrument Tag Name (8 characters 0-9,A-Z,_)
AI302NAM:= AI302
? END <Enter>
Save changes (Y,N)? Y <Enter>
Settings Saved
=>>
Figure 6.3 Settings to Configure Input 1 as a 4–20 mA Transducer, Measuring
Temperatures Between –50°C and 150°C
To Next Page
Loading...
