Siemens sitrans LU10 - Page 92

Page 88 SITRANS LU10 – INSTRUCTION MANUAL 7ML19985AN02
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Technical Reference
Parameter Settings For LU AO mA Output # 1
Parameter Settings For Temperature Averaging
With process control equipment disabled, enter the RUN mode to monitor system
performance and alarm programming. (A Reading Measurement simulation (P920) may
be performed to verify mA output programming).
When satisfied with system performance and programming, connect LU AO mA output 1
to the Programmable Logic Controller (PLC).
Note that on SITRANS LU10 "power off" the LU AO mA output is "held" and on LU AO
"power off" the mA output drops to 0.00 mA. During a power interruption, the "last known"
mA output value is maintained in memory for 1 hour minimum. If power is interrupted
beyond 1 hour, on power resumption, the mA output immediately assumes the "new
value".
Remaining Vessel Capacity
To perform a volume conversion for the preceding example, the following programming is
required.
Volume Parameter Settings For Point # 1
* This is the only tank shape where the Empty (P007) value must exactly equal the vessel
height.
Now in the RUN mode, the Reading Value and LU AO mA output represents remaining
vessel capacity in cubic feet. If the mA output is still to be scaled to "space" (distance from
material to Full in feet) set the mA Function (P201) to "2".
P200 mA Range No entry required. (preset for 20 mA = low level,
20 mA = low level,20 mA = low level,
20 mA = low level,
P001 = 2.)
P213 mA Max Limit Enter "20.2" for 20.20 mA.
20.20 mA.20.20 mA.
20.20 mA.
P219 mA Failsafe Enter "20.2" for 20.20 mA.
20.20 mA.20.20 mA.
20.20 mA.
P660 Temp Source Enter "5" for average
averageaverage
average XCT-8 and TS-3
temperatures.
P050 Tank Shape Enter "7"* for horizontal cylinder with parabolic
horizontal cylinder with parabolic horizontal cylinder with parabolic
horizontal cylinder with parabolic
ends
endsends
ends.
P051 Max Volume Enter "117" for 117 cubic feet
117 cubic feet117 cubic feet
117 cubic feet (Use vessel
fabricators value).
P052 Tank Dimension A Enter "1.5" for 1.5 ft
1.5 ft1.5 ft
1.5 ft (the horizontal length of one
parabolic end).
P053 Tank Dimension L Enter "12" for 12 ft
12 ft12 ft
12 ft (the horizontal length,
excluding parabolic ends).