VAF instruments OILCON MARK 6M - 15.7 AIR SUPPLY PROBLEMS; 15.8 SOLENOID VALVE PROBLEMS

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15.7 AIR SUPPLY PROBLEMS
15.7.1 Air supply failure
Probable causes Action
1
No air supply

Check the air supply to the EPU, normally set to 4.0
bar (0.4 MPa).
 Check the ship’s control air supply.
 Check all connections for leakage.
2
Pressure sensor failure

Check the connections to the pressure sensor on the
solenoid valve block on the EPU assembly.
 Check the functioning of the pressure sensor with a
digital voltmeter for open/closed circuit function.
15.7.2 Water found in the monitors of the air system
Probable causes Action
1
Water in air supply unit housing.

Check the air supply unit regulator and drain if
necessary.
If a great deal of water is found the filters in the regulators
need to be replaced.
2
Malfunction in ship’s control air
system.

Check the ship’s compressors.
 Check the ship’s air dryers.
15.8 SOLENOID VALVE PROBLEMS
15.8.1 Valve not working
Probable causes Action
1
No air supply

Check the air supply unit regulator, normally set to 4.0
bar (0.4 MPa).
 Check the ship’s control air supply.
 Check all connections for leakage.
2
24 V power supply failure

Check the 24 V power supply.
 Check the fuse of the power supply.
 Check the connections to the solenoid valve.
3
Solenoid valve actuator not
functioning

Check the solenoid valve connections.
 Change the plug on the faulty solenoid, for the plug
from a solenoid that is known to be working.
Replace if necessary.
4
Solenoid air valve not working

Check the air valve for dirt, water or other
contamination.
Replace if necessary.