Atlas Copco XAS96 DdG Manuel D'instructions page 34

XAS96 DdG, DdG IT
Problem
6. Engine fires but general
alarm lamp (H2) remains
alight; compressor stops
when releasing (S1).
7. Engine is running but shuts
down immediately after
(S1) has been released.
8. General alarm lamp (H2)
remains alight for over 5
seconds after starting.
9. Hourmeter does not count
running time.
10. Compressor does not unload
and engine keeps running at
maximum speed when
closing the air outlet valves;
safety valve blows.
11. Compressor capacity or
pressure below normal.
12. Working pressure rises
during operation and causes
safety valve to blow.
34
Possible faults
a. Alternator drive belt broken or slipping.
b. Alternator (A)/regulator defective.
a. Contact switch (S1) released too soon.
b. Insufficient engine oil pressure.
c. Fuel tank contains insufficient fuel.
d. Engine oil pressure shut-down switch (S3),
engine temperature switch (S2) or compressor
temperature switch (S5) defective.
a. Insufficient engine oil pressure or
too high engine oil temperature.
b. Engine oil pressure switch (S3), or compressor
temperature switch (S5) defective.
c. Relay (K1) defective.
a. Hourmeter (P1) defective.
a. Air leaks in regulating system.
b. Regulating valve (RV) incorrectly set or
defective.
c. Unloading valve (UV) or its actuating piston
stuck.
a. Air consumption exceeds capacity of
compressor.
b. Choked air filter element (AF).
c. Unloading valve (UV) not completely open.
d. Engine does not run at maximum speed.
e. Oil separator element (OS) clogged.
a. See faults 10.
b. Safety valve (SV) opens too soon.
Corrective actions
a. Check and correct as necessary.
b. Have assembly repaired.
a. Release button after engine oil pressure has
built up to above the minimum allowed value.
b. Stop at once, consult Engine Operation
Manual.
c. Fill fuel tank.
d. Remove and test switches.
Replace if out of order.
a. Stop at once, consult Engine Operation
Manual.
b. Stop at once, test switches, replace as
necessary.
c. Replace (K1).
a. Replace.
a. Check and repair.
b. Adjust or repair regulating valve;
see section 5.1.
c. Repair unloading valve assembly.
a. Check equipment connected.
b. Replace air filter element (AF).
c. Speed regulation cable maladjusted;
see section 5.1.
d. Check the maximum speed, service the fuel
filter.
e. Have element removed and inspected by an
Atlas Copco Service representative.
a. See remedies 10.
b. Have safety valve adjusted;
consult Atlas Copco.