26
1310 3011 08
Problem
Possible faults
Corrective actions
6.
Engine fires but general
alarm lamp (H2) remains
alight; compressor stops
when releasing (S1).
a.
Alternator drive belt broken or slipping,
b.
Alternator/regulator defective.
a.
Check and correct as necessary.
b.
Have assembly repaired.
7.
Engine is running but shuts
down immediately after S1
has been released.
a.
Override switch released too soon.
b.
Insufficient engine oil pressure.
c.
Fuel tank contains insufficient fuel.
d.
Engine oil pressure shut-down switch,
engine temperature switch or compressor
temperature switch defective.
a.
Release switch after engine oil pressure has
built up to above the minimum allowed
value.
b.
Stop at once, consult the engine Instruction
manual.
c.
Fill fuel tank.
d.
Remove and test switches. Replace if out
of order.
8.
General alarm lamp (H2)
remains alight for over 5
seconds after starting.
a.
Insufficient engine oil pressure or too high
engine coolant temperature.
b.
Engine oil pressure switch (S3), or
compressor temperature switch (S5)
defective.
c.
Relay (K1) defective.
a.
Stop at once, consult Engine Operation
Manual.
b.
Stop at once, test switches, replace as
necessary.
c.
Replace (K1).
9.
Hourmeter does not count
running time.
a.
Hourmeter defective,
a.
Replace.
10. Compressor does not
unload and engine keeps
running at maximum speed
when closing the air outlet
valves; safety valve blows.
a.
Air leaks in regulating system.
b.
Regulating valve (RV) incorrectly set or
defective.
c.
Unloading valve (UV) or its actuating
piston stuck.
a.
Check and repair.
b.
Adjust or repair regulating valve; see
section 5.1.
c.
Repair unloading valve assembly.
11. Compressor capacity or
pressure below normal,
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.
Check equipment connected.
b.
Service 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.
12. No air output.
a.
Drive coupling broken.
a.
Consult Atlas Copco.
13. Working pressure rises
during operation and
causes safety valve to
blow.
a.
See faults 10.
b.
Safety valve (SV) opens too soon.
a.
See remedies 10.
b.
Replace safety valve;
Consult Atlas Copco
14. Excessive compressor oil
consumption. Oil mist
being discharged from air
outlet valve (5-fig. 4.2).
a.
Restrictor in oil scavenging line clogged,
b.
Oil separator element (OS) defective.
c.
Oil level too high.
a.
Dismount, clean and refit restrictor;
b.
Replace element.
c.
Check for overfilling. Release pressure and
drain oil to correct level.
