Siemens LMV36.520A1 Basic Documentation page 54

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The connection facility can also be used as POC (proof of closure) (refer to chapter
Sequence diagrams).
No. Parameter
Gas: Pressure switch-max / POC input
0 = inactive
237 1 = pressure switch-max
2 = POC
3 = pressure switch valve proving
Fuel 1 gas: Pressure switch-max / POC input
0 = inactive
337 1 = pressure switch-max
2 = POC
3 = pressure switch valve proving
Note
If the input is used for POC or for pressure switch valve proving can be included in the
safety loop. In that case, pressure switch-max must not be fitted between the valves,
but downstream from them.
Gas pressure switch-max
In all types of gas trains, the maximum gas pressure is monitored from phase 40. If the
maximum gas pressure is exceeded, the system initiates lockout.
Error Diagnostic
code code
14 0
1
21 0
During the safety times (TSA1 / TSA2), the signal from pressure switch-max is only
assessed after a certain period time has elapsed in order to ignore the pressure shocks
that occur the moment the valves open.
No. Parameter
229 Gas: Time to respond to pressure faults within safety time 1 (TSA1) and safety
time 2 (TSA2)
329 Fuel 1 gas: Time to respond to pressure faults within safety time 1 (TSA1) and
safety time 2 (TSA2)
Basic documentation LMV36...
7 Basic unit
Meaning for the LMV36... system
POC open
POC closed
Pressure switch-max (Pmax): Max. gas pressure exceeded
CC1P7544en
25.09.2013