MAN205-0195042EN Rev. A
Aug. 2011
Page 86 of 137 pages
Symptoms
Possible causes check-ups and
tests
Corrections
3. Steam pressure
increases beyond the
control point.
3.1
Pressure switch faulty or
incorrectly set.
3.1
Check, repair or
replace the
pressure switch.
3.2
Contacts at contactor
welded because of short
circuit.
3.2
Check the cause
and replace the
damaged
contactor.
4. The conditioning
phase (pre-vacuum
does not work).
No steam inlet or low
steam pressure.
4.1
Check if the trouble is due to
pump or its electrical supply
circuit.
4.1
See solutions
indicated in par. 2.
4.2
The vacuum valve passing
water through the vacuum
pump stuck or damaged.
4.2
Check, repair or
replace the water
to pump valve.
4.3
The exhaust to pump valve
stuck or damaged.
4.3
Check, repair or
replace the fast
exhaust valve.
4.4
Door improperly closed,
gasket damaged or
incorrectly seated on the
groove.
4.4
Close the door, fix
or replace the
gasket.
4.5
Leakage at the vacuum or
exhaust piping.
4.5
Check and tighten
fitting joints,
replace defective
packing.
4.6
Steam inlet valve blocked or
damaged.
4.6
Fix or replace the
steam valve.
4.7
Low pressure at the steam
supply line.
4.7
Check the
generator as
shown in par. 2.
4.8
Control system trouble.
4.8
Replace the
control boards.
4.9
Manual steam feed valve is
closed.
4.9
Open the manual
valve.
5. Pre-vacuum phase
completed but
temperature and
pressure are low and
the sterilization point is
not reached or it takes
a long time to reach it.
5.1
5.2
Low pressure at the steam
supply line.
Steam inlet valve clogged or
damaged.
5.1
5.2
Check steam
generator, fix
pressure.
Check and fix or
replace the steam
valve.
5.3
Electronic pressure
transducers or measuring
circuits faulty or set too low.
5.3
Set correctly or
replace boards.
5.4
Control system trouble.
5.4
Replace the
control boards.
Содержание 6671130
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