24 1310 3011 73
5. Starter motor cranks
engine when Switching
S1 to “I” but engine does
not fire.
a. Switch (S1) defective,
b. Fuel solenoid (Y1) defective.
c. Low battery output.
a. See remedy 4b.
b. Check solenoid and its valve; correct or
replace as necessary.
c. See 1a.
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
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