6. Applications
6.1 Set point monitoring
In a 10 m high silo the height is to be displayed, a low set point
of 1.5 m and a maximum set point of 8.5 m are to be
monitored. The hysteresis, in order to avoid relay hunting
around the set point is, in both cases to be set at 0.25 m. The
minimum set point is also to have a switch time delay of 10 sec.
Example:
Input signal and display:
- Sensor signal 0-20 mA equals 0-10 m
- Numeric display should show 0.00-10.00 (m)
- Bargraph should show 0.00-10.00 (m)
Set point 1:
- Minimum safety
- Switch point 1.50 (m)
- Hysteresis 0.25 (m)
- Time delay 10 s
Set point 2:
- Maximum safety
- Switch point 8.50 (m)
- Hysteresis 0.25 (m)
- Time delay 0 s
Setting up:
Menu group Address Value
Analogue input
INPUT Input range RANG
0-20
Display
DISPL Decimal point DI DP
Display value 0% DI LO
Display value 100% DI HI
Scale bargraph/analog. 0% BG LO
Scale bargraph/analog. 100% BG HI
999,99
0,00
10,00
0,00
10,00
Set point/fault monitor
LIM1 Mode MODE1
Set point SETP1
Hysteresis HYST1
Time delay DELY1
MIN
1,50
0,25
10
Set point/fault monitor
LIM2 Mode MODE2
Set point SETP2
Hysteresis HYST2
Time delay DELY2
MAX
8,50
0,25
0
Process display
65
EN-RIA03.CHP
Thu Jan 11 14:09:45 2001
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