Parker CDAS HL 050 Series, Инструкции по установке, эксплуатации и обслуживанию, Страница: 67 / 75

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Medium Flow Compressed Air Dryers - IOMI.
Confirm loss of dewpoint
Check outlet dewpoint downstream of the
dryer with an with external
hygrometer.
If outlet dewpoint on external hygrome-
ter does not match
dewpoint on dryer display - check sen-
sor the dryer dewpoint sensor
Confirm dryer sizing
Check sizing
(Max inlet flow rate, Min inlet pressure, Max
inlet temperature) Sizing correct, continue below.
Sizing incorrect, install correctly sized
dryer or correct inlet parameters.
Confirm no liquid is present at
inlet to coalescing filters
Check aftercooler drain operation.
Check liquid separator drain operation.
Check air receiver drain operation.
Check condensate lines are not blocked &
condensate is flowing correctly.
Coalescing filters are not designed for
liquid removal (water & oil aerosols
only).
If upstream equipment drains are not
operating correctly and / or condensate
is not being discharged from these
drains correctly, excessive liquid will be
entering the inlet filters and overloading
the dryer, leading to loss of dewpoint
If no wet air receiver is fitted in the
compressed air system before the dryer,
an optional WS grade water separator
should always be installed prior to the
coalescing filters.
Confirm pre-filtration drains are
operating correctly
Check General Purpose Coalescing Filter
Float Drain Operation
Check High Efficiency Coalescing Filter Float
Drain Operation
Check condensate lines are not blocked &
condensate is flowing correctly.
If an optional WS grade water separator is
fitted, check float drain
operation.
If the drains fitted to the dryer pre
filters (and optional WS if fitted) are not
operating correctly and / or condensate
is not being discharged correctly, ex-
cessive liquid will be entering the dryer,
resulting in loss of dewpoint.
Confirm purge setting
Check purge has been set for the MINIMUM
inlet pressure to the dryer.
Purge is factory set for 6 bar g and must
be reset on commissioning to the mini-
mum inlet pressure into the dryer.
Incorrectly set purge will result in
insufficient purge to regenerate the
desiccant material, resulting in loss
of outlet dewpoint or excessive purge
resulting in insufficient compressed air
downstream, dropping system pressure
and potentially overloading the dryer
leading to loss of dewpoint
Check dryer is cycling correctly
(all valves are functioning)
Check dryer is cycling between each column
Check the dryer is depressurising when
required
Check the dryer is purging when required
Check the dryer is repressurising when
required
If dryer does not changeover, ensure both
inlet cylinders are operating correctly
(check 5/2 valve operation, individual
cylinder operation and seals)
If dryer does not depressurise, ensure
exhaust valve is operating correctly (check
5/2 valve operation, exhaust cylinder
operation and seals)
If the pressure gauge for the column
undergoing regeneration (purging) shows
a pressure >350mbar, ensure exhaust
silencer is not blocked (check 5/2 valve
operation, cylinder operation and seals)
If dryer does not repressurise, ensure
exhaust valve is operating correctly (check
5/2 valve operation, cylinder operation
and seals)
If dryer does not repressurise fully before
changeover, ensure correct purge setting
and check QRV valve operation
Normal Function
Changeover
Column A drying
Exhaust valve open
Column B depressurised
Column B purging - no dP on gauges
Exhaust valve closes
Column B repressurises and reaches full line
pressure before changeover
After 3 minutes, if dewpoint < setpoint, dryer
enters EST, ECO shown on screen
Dewpoint set-point reached
Changeover
LED's illuminated on the solenoid
plug’s but dryer fails to cycle correctly
Check when the LED is illuminated that
24VDC is at the output of the plug
Check the condition of the spool valve for
smooth movement.
Loss of Outlet Dewpoint