Siemens KION Service Manual page 148

x 277 ... 01 15 ... CON:
DIAG_PUC_MUSHROOM_LEAKAGE_AFTER_
OPEN_FAILURE
Sub data:
... 00 01 MUSH_HAND_CIRCLE
... 00 02 MUSH_POPOFF
... 00 03 MUSH_BAG
... 00 04 MUSH_ABSORBER
Fault: The pressure is not consistent on both of the sides of the mushroom valve,
despite that the mushroom valve should have opened , when tested in PuC. The
Checking mushroom valves-test fails.
Description: Refer to information regarding "Checking mushroom valves" in chapter
"Service procedures", section "Pre-use check".
During the mushroom valve test in PuC, the mushroom valves are pressurized on one
side. Thereafter, the pressure on the other side is measured. In case of leakage, a
pressure is built-up on the other side of the valves. This final test checks that the
valves opens correctly and the pressure is consistent on both side of the mushroom
valves. The PEEP valve is closed during the test.
Tests order: MV1, MV2, MV3, MV4, MV5, OV12
Refer to sub data to see witch valve that was tested in the sequence when failure
occurs.
Note: Sub data states error on one of the valves, but the actual error may however
also be found at one of the valves that remains to be tested
Criteria to ensure equal pressure on both sides of the valve after 5 seconds when
opening mushroom valves:
Valve Pressure Mushroom valves open
for test (cmH2O) during the test
MV1 MAN > INSP - 10 MV1
MV2 PEEP > INSP - 10 MV2
MV3 PEEP > INSP - 10 MV3
MV4 INSP > PEEP - 10 MV4
MV5 INSP > MAN - 10 MV5
OV12 INSP > 10 MV5*
*The MV5 is opened when the OV12 valve is tested. If there is a leakage in OV12, the
gas will flow into the manual breathing bag with a pressure decrease as consequence.
If the pressure consistent criteria for the mushroom valve tested is not fulfilled this
diagnostic log is written.
What to do:
1. Check the function of EMV1-5. Refer to information in section "If the Pre-use
check fails" regarding the mushroom valve test.
2. Check the mushroom valve control gas supply pressure (20 kPa delivered
by REG 1). For adjustment of REG 1, refer to the tool "Pressure Tester 0.2
bar regulator", Order No. 65 62 479. If the pressure is too high, the
mushroom valves may stick in inflated position inside the cassette
MV1
MV2
MV3
MV4