Atlas Copco XAHS 37 DD, Instruction Manual

Page: 52 / 64

52
Instruction Manual
Problem Possible faults Corrective actions
9. Hourmeter (P1) does not
count running time. a. Hourmeter (P1) 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 elements (AF).
c. Unloading valve (UV) not completely open.
d. Engine does not run at max. speed.
e. Oil separator element (OS) clogged.
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.
12. 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. Have safety valve adjusted;
consult Atlas Copco.
13. Excessive compressor oil
consumption. Oil mist being
discharged from air outlet
valve(s).
a. Restrictor in oil scavenging line (SL) 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.
14. Compressor shuts down
through a shutdown switch.
a. Alternator V-belt broken or slipping.
b. Compressor overheating.
c. Engine oil pressure too low.
d. Engine temperature too high.
a. Re-tense or replace V-belt.
b. See condition 16.
c. Check lubricating system.
d. Check engine oil system; see Engine
Operation Manual.
15. Air and oil mist expelled from
air filter after stopping.
a. Unloader valve (UV) defective.
b. Wrong oil type (without foam-retarding additives).
a. Repair valve.
b. Consult Atlas Copco.
16. Compressor overheating. a. Insufficient compressor cooling.
b. Oil cooler (OC) clogged externally.
c. Oil system clogged internally.
d. Oil level too low.
a. Relocate compressor.
b. Clean cooler; see section 4.6 .
c. Consult Atlas Copco.
d. See section 4.4 .
17. No air output. a. Drive belt broken. a. See section 5.7 .
Generator DDG 110V:
18. Circuit breakers are off
(down).
a. Short circuit or overload.
b. Circuit breakers switched off.
a. Remedy fault. Switch on circuit breakers.
b. Switch on circuit breakers.
19. Green lamp H3 is
deactivated.
a. Circuit breakers are off.
b. Serious electrical fault.
a. Switch on circuit breakers.
b. Consult Atlas Copco.
Generator DDG IT 230/400V:
20. Circuit breakers Q1 are off
(down).
a. Short circuit.
b. Temperature in generator too high.
a. Remedy fault. Switch on circuit breakers.
b. Check generator cooling.
21. Green lamp H3 is
deactivated.
a. Circuit breakers are off.
b. Serious electrical fault.
a. Switch on circuit breakers.
b. Consult Atlas Copco.