Setting The Time For Making The Pressure Switch Test - Siemens LMV37.4 Series Basic Documentation

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Start release gas
If, at the same time, the input is used as a start release input (e.g. for an air supply
damper), it can be connected in series with the pressure switch.
When selecting Valve proving via pressure switch-min (parameter 236), function Start
release gas is not supported.
Oil pressure switch-min
In all types of oil train, the minimum oil pressure is expected from phase 38. If no oil
pressure is detected when the maximum time (parameter 217) has elapsed or if,
subsequently, the oil pressure drops, the system initiates lockout.
No. Parameter
Maximum waiting time for detecting a detector or pressure switch signal (e.g.
217
home run, preignition)
Error Diagnostic
code code
20 0
20 1
During the safety times (TSA1/TSA2), the signal from pressure switch-min is only
assessed after a certain period of time in order to ignore the pressure shocks that occur
the moment the valves open. The time to elapse for signal assessment can be
parameterized.
No. Parameter
Oil: Time to respond to pressure faults within safety time 1 (TSA1) and safety
269
time 2 (TSA2)

7.3.8 Setting the time for making the pressure switch test

For oil pressure switch-min, the point in time after which the evaluation is made can be
set via parameter 276 (active from phase 38 or from the safety time (TSA)).
No. Parameter
Oil: Pressure switch-min-input
0 = inactive
276
1 = active from phase 38
2 = active from the safety time (TSA)
Basic documentation LMV37.4...
7 Basic unit
Meaning for the LMV37.4... system
Pressure switch-min (Pmin)
No min. gas / oil pressure
Gas shortage start prevention
CC1P7546en
20.09.2013