VAF instruments OILCON MARK 6M, Техническое руководство

Страница: 101 / 175

100
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.