Atlas Copco XAS 67 DD Instruction Manual page 58

Problem
9. Hourmeter (P1) 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.
13. Excessive compressor oil
consumption. Oil mist being
discharged from air outlet
valve(s).
14. Compressor shuts down
through a shutdown switch.
15. Air and oil mist expelled from
air filter after stopping.
16. Compressor overheating.
XAS 67 DD - XAS 130 DD7,
XATS 67 DD - XATS 125 DD7:
17. No air output.
Generator DDG 110V:
18. Circuit breakers are off
(down).
19. Green lamp H3 is
deactivated.
Generator DDG IT 230/400V:
20. Circuit breakers Q1 are off
(down).
21. Green lamp H3 is
deactivated.
58
Possible faults
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 elements (AF).
c. Unloading valve (UV) not completely open.
d. Engine does not run at max. speed.
e. Oil separator element (OS) clogged.
a. See faults 10.
b. Safety valve (SV) opens too soon.
a. Restrictor in oil scavenging line (SL) clogged.
b. Oil separator element (OS) defective.
c. Oil level too high.
a. Alternator V-belt broken or slipping.
b. Compressor overheating.
c. Engine oil pressure too low.
d. Engine temperature too high.
a. Unloader valve (UV) defective.
b. Wrong oil type (without foam-retarding additives).
a. Insufficient compressor cooling.
b. Oil cooler (OC) clogged externally.
c. Oil system clogged internally.
d. Oil level too low.
a. Drive belt broken.
a. Short circuit or overload.
b. Circuit breakers switched off.
a. Circuit breakers are off.
b. Serious electrical fault.
a. Short circuit.
b. Temperature in generator too high.
a. Circuit breakers are off.
b. Serious electrical fault.
Instruction Manual
Corrective actions
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.
a. Dismount, clean and refit restrictor.
b. Replace element.
c. Check for overfilling. Release pressure and
drain oil to correct level.
a. Re-tense or replace V-belt.
b. See condition 16.
c. Check lubricating system.
d. Check engine oil system; see Engine
Operation Manual.
a. Repair valve.
b. Consult Atlas Copco.
a. Relocate compressor.
b. Clean cooler; see section 4.6.
c. Consult Atlas Copco.
d. See section 4.4.
a. See section 5.7.
a. Remedy fault. Switch on circuit breakers.
b. Switch on circuit breakers.
a. Switch on circuit breakers.
b. Consult Atlas Copco.
a. Remedy fault. Switch on circuit breakers.
b. Check generator cooling.
a. Switch on circuit breakers.
b. Consult Atlas Copco.