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Building Technologies Basic documentation LMV37.4... CC1P7546en
7 Basic unit LMV37.4 17.12.2018
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
217
Maximum wait time for detecting a detector signal or pressure switch signal
(e.g. home run, preignition)
Error
code
Diagnostic
code
Meaning for the LMV37.4
20 0
Pressure switch-min
No min. gas / oil pressure
20 1 Gas shortage start prevention
During the safety times, 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
269 Oil: Time to respond to pressure faults in the first and second safety time
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).
No. Parameter
276
Oil: Input pressure switch-min
1 = active from phase 38
2 = active from safety time
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