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Building Technologies Basic documentation LMV37.4... CC1P7546en
7 Basic unit LMV37.4 17.12.2018
Oil pressure switch-max
In all types of oil trains, the maximum oil pressure is monitored from phase 22. If the
maximum oil pressure is exceeded after the maximum time (parameter 214) has
elapsed, or during the subsequent phases, the system initiates lockout.
No. Parameter
214 Maximum time to start release
Error
code
Diagnostic
code
Meaning for the LMV37.4
14 0 POC open
1 POC close
21 0
Pressure switch-max: Max. oil pressure exceeded
POC: POC open (software version V02.00)
1
POC: close (software version V02.00)
During the safety times, the signal from pressure switch-max is only assessed after a
certain period of time has elapsed in order to ignore the pressure shocks that occur the
moment the valves open.
No. Parameter
269 Oil: Time to respond to pressure faults in the first and second safety time
The pressure switch connection can also be used as POC (Proof of Closure) (refer to
chapter Sequence diagrams).
No. Parameter
277
Oil: Input pressure switch-max / POC
1 = pressure switch-max
2 = POC
3 = not used
4 = additional speed-dependent air pressure switch
Note
If the input is used for POC, pressure switch-max can be included in the safety loop.
In that case, pressure switch-max must not be installed between the valves, but
always downstream from them.
Start release oil
If the input is simultaneously used as a start release input, e.g. for an air supply damper,
the latter can be connected in series with the pressure switch.
Parameters with POC function cannot be used as start release input.
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