Pneumatic Valves Replacement; Practical Hints For Troubleshooting; Millenium - MIL'S SEC A Manual De Operación Y Mantenimiento

4.8. Pneumatic valves replacement

To respect the way direction (to refer to the spare parts list)
5.

PRACTICAL HINTS FOR TROUBLESHOOTING

FAULT POSSIBLE CAUSES
1. Bad dew point 1.1. Clogged silencer.
1.2. Too low regeneration flow.
1.3. R2 or R4 valve doesn't open.
1.4. Dryer cycle doesn't operate.
1.5. Automatic drains below upstream
filters not managed.
1.6. Polluted drying system
(=dessicant).
1.7. Too high air inlet temperature.
1.8. Under dimensioning of the dryer
compared to the air flow.
2. Regeneration flow 2.1. 'A' part : in regeneration:
is too high. Leaked non-return valve 'C1' /
Leaked valve 'V1'.(example :
pierced diaphragm)
'B' part : in regeneration:
Leaked non-return valve 'C2' /
Leaked valve 'V3'
3. During 3.1 Clogged silencer.
regeneration 3.2 Clogged 'dessicant' (=drying
phase, the pressure system) in cylinders.
is too high (M1 or 3.3 R2 or R4 valve doesn't open
M2) completely.
4. Air leak when the 4.1 V1 / V3 pierced diaphragm.
pilot of V1 / V3 is 4.2 Dirt on the o-ring of the pilot.
currentless
518718-12
SEC A / 1A / 2A / 7OX / 7HC –AD 5xxx
SUITABLE REMEDIES
1.1. Replace it.
1.2. Check 'E1' and 'E2' nozzles.
1.3. Check operation valves.
1.4. Check the '14-15' cable.
1.5. Check or replace drain systems.
1.6. Use forced operation of the
dryer or replace cylinders.
1.7. Decrease the temperature or
connect an air electro-cooler
upstream.
1.8. Decrease the flow or replace
the dryer.
2.1. Clean it or replace it.
3.1 Replace it.
3.2 Replace cylinders.
3.3 Clean valves or replace them.
4.1 Replace it.
4.2 Clean or replace the pilot.
6.

MILLENIUM

1 st line : state of 'A' part
A : Regener.0240 : 'A' cylinder(s) in regeneration phase.
A : Pressur.0060 : 'A' cylinder(s) in pressurisation phase.
A : In Service : The air is analysed through 'A' part.
The dryer is stopped and air can't pass there through
'240' and '60' correspond to the numbers of seconds which are deducted, respectively, during the
regeneration and pressurisation phases.
2 nd line : state of 'B' part
B : Regener. 0240: 'B' cylinder(s) in regeneration phase.
B : Pressur.0060 : 'B' cylinder(s) in pressurisation phase.
B : In Service : The air is analysed through 'B' part.
3 rd line : dryer operation type
Auto Operation : automatic operation by closing or opening of terminals '14 – 15'.
Forced Operation : forced operation by closing of terminals '14 – 16'.
Test Operation : by pressing + buttons at the same time, the dryer operates a test phase :
The regeneration time becomes 15 seconds instead of 4 minutes and the pressurisation time remains to 1
minute.
To stop the test operation phase:  Press
Operation /48H: by pressing + buttons at the same time, the dryer operation is forced during
48 hours.
To stop 'the forced operation during 48 hours' phase:  Press
power supply.
On Standby: operation order on standby.
If terminals '14-15' are not managed (in closed position) (automatic operation order) during 2 hours, 2
cycles operate automatically.
+ buttons or switch off the power supply.
+ buttons or switch off the
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