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a D:GROUP Company
8
TROUBLESHOOTING - PROBABLE CAUSES OF MALFUNCTIONS
PROBLEM
Cabinet does not work
Alarm: "front window open"
Alarm: "HEPA filter clogged"
Alarm:
"No
laminar
velocity"
Alarm: "low barrier velocity"
Alarm: "No barrier velocity"
After a period of user-absence an
alarm sounds but the cabinet
works normally
During work, an alarm sounds,
laminar airflow stops and the
speed of the protective barrier
increases (also the noise level
increases due to the higher speed
of the exhaust fan). Alarm "LAF
velocity" starts.
00055EN Rev.10 – 12/2011
- Power outage upstream from the
cabinet
- Electronic board out of order
- Blown fuse(s)
The front window is not properly
closed
Main HEPA filter clogged
air-flow
Defective LAF flow sensor
The exhaust fan is out of order
- HEPA filters are clogged
- Insufficient
current rushes in the mains
Exhaust flow sensor out of order
Possible blackout for a period of
about 5 seconds to 2 hours.
The main fan is out of order
CAUSE
voltage
due
to
REMEDY
- Check the voltage input to the
cabinet
- Replace PCB
- Replace fuses
Close the front window
Replace HEPA filter
Replace sensor
- If laminar airflow is present,
check if exhaust duct is clear
- Check the exhaust motor-fan
fuse (3A)
- If the problem persists, check
the
motor
relay
electronic card located under
the control panel.
- Check the exhaust motor-fan
- Replace HEPA filters
- Control power voltage and if
the problem persists, use a
voltage stabilizer
Replace the sensor
Switch off the cabinet and then
switch it on again. If the alarm
stops, the blackout is confirmed.
In this case the user knows that
there
can
be
airborne particle contamination
from
the
cabinet
environment.
If the alarm persists after re-
starting the cabinet, proceed as
for the previous problem.
IMPORTANT: if this problem
occurs,
the
work
contaminated by the laboratory
air, but the environment is fully
protected from any contaminants
present in the work area.
in
the
exhausted
into
the
area
is
30
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