3 . R e p a i r I n s t r u c t i o n s
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3.3.8.1
DFS Pressure Test
General Comments
The closing function of VLA is tested implicitly together with all
tests that generate an overpressure at PDA, because the
overpressure is not built up and not maintained when VLA is open.
Therefore an explicit test of VLA is not required. DFS pressure test:
•
A controlled membrane movement is performed to the outlet
side prior to the phase Pressure build-up VDABK.
•
The FPE and FPA pumps are set to 1500 ml/min in phases with
membrane movement. Thus a fast movement of the membrane
is achieved.
•
UFP is activated during the pressure build-up phase and thus
tested.
•
The evaluation of the pressure changes in a test interval is
performed via the pressure at the end of the test interval. (The
pressure difference to the minimum and maximum sensor
value is created in the test interval.)
•
VLA is opened for 5 s at the beginning of the test to ensure
that the air separator is completely filled with water.
Simultaneously the function for the monitoring of the current
is checked.
•
UFP is started during the pressure build-up phase.
•
The acknowledgement of the single test steps in the DFS
pressure test is performed via a bit in the internal
communication (between LLS and LLC).
