18
Table 2: Faults, effects, causes and remedy
Fault
Effect
Possible cause
Remedy
Purge process does
not begin
No display of
remaining purge time
after the supply
voltage has been
applied
Fuse blown in the
controller
Service by
manufacturer
No display of
remaining purge time
after the supply
voltage and the
compressed air have
been applied
Minimum
overpressure for
purge start has not
been achieved
Seal off enclosure and
internal installations;
possibly readjust
leakage air nozzle
Air quantity is not
sufficient for
successful purge
Dynamic inlet
pressure too low
(<“Switchpoint fo
Purge Start“). Set inlet
pressure to at least 2
bar dynamic
Pressure is below MIN
value. Internal
enclosure pressure
not sufficient after
purge. Pressure drops
off.
Seal off enclosure and
internal installations;
possibly readjust
leakage air nozzle
Air quantity is not
sufficient for
successful purge.
Cross-section of inlet
for compressed air/
inert gas is too small
Increase the diameter
of the air supple hose
Pressure regulator
incorrectly set (e.g.
2.0 bar static)
Adjust the pressure
regulator to e.g. 2.0
bar dynamic (i.e. for
flow of compressed
air/ inert gas)
Fuse of the purge
valve is defective
(valve is closed when
de-energized)
Exchange the fuse at
the digital/proportional
valve
Purge process is
aborted
After 5 s, the
remaining purge time
is reset to the initial
value
Air quantity is not
sufficient for
successful purge
Dynamic inlet
pressure too low. Set
the inlet pressure to at
least 2 bar dynamic