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

Building Technologies
HVAC Products
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 (P236), function „Start release
gas" is not supported.
Pressure switch-min-oil
In all types of oil train, the minimum oil pressure is expected from phase 38. If no oil
pressure is detected after the maximum time (P217) has elapsed or if, subsequently, the
oil pressure fails, 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
During the safety times (TSA1 / TSA2), the signal from pressure switch-min is only as-
sessed after a certain period of time has elapsed 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)

6.3.8 Setting the time for making the pressure switch test

For pressure switch-min-oil, 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...
6 Basic unit
Meaning for the LMV37.4... system
Pressure switch-min (Pmin)
No min. gas / oil pressure
39/213
CC1P7546en
01.12.2009