Thermal Arc 6045 EXCEL-ARC, Руководство по эксплуатации

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EXCEL-ARC 500, 6045
5-2 August 22, 2005
5.04 Troubleshooting Guide
General:
(Also refer to Troubleshooting in wire feeder and gun
manuals.)
1. Welding machine will not start.
A. Power switch OFF.
1) Place power switch in ON position.
B. Power lines dead.
1) Check voltage.
C. Broken power lead.
1) Repair.
D. Wrong line voltage.
1) Check power supply.
E. Incorrect input power connections at welding
machine.
1) Check connections against wiring diagram.
F. Open circuit to power switch or control
transformer.
1) Repair. Check for broken wire or loose
connections at terminals.
G. Fuse on control transformer blown.
1) Remedy cause. Replace fuse.
2. Line contactor fails to close.
A. Defective NVR coil.
1) Replace.
B. Mechanical obstruction on contactor.
1) Remove.
C. Broken leads at line contactor.
1) Repair.
3. Contactor chatters.
A. Line leads too small.
1) Use larger leads.
B. Low line voltage.
1) Check line voltage.
4. Contactor operates and blows link fuses.
A. Wrong line voltage.
1) Check nameplate of welding machine for
line voltage to use; check line voltage.
B. Links on voltage changeover board incorrectly
connected.
1) Check Voltage Changeover diagrams for
link positions; connect links correctly. See
Diagrams chapter.
C. Line fuse too small.
1) Install proper size fuse.
D. SCR failure or shorted flyback diode.
1) Refer to Detailed Troubleshooting
Instructions.
E. Short circuit in primary connections.
1) Remove short circuit.
F. Transformer failed.
1) Repair or replace.
5. Unit delivers welding current but soon shuts down
(Thermal overload trips).
A. Welding machine overloaded.
1) Reduce load, overload can be carried only
for a short time.
B. Duty cycle too high.
1) Do not operate continually at overload
currents.
C. Power leads too long or too small in cross
section.
1) Replace with larger diameter cable.
D. Ambient temperature too high.
1) Operate at reduced loads when
temperature exceeds 104° F (40° C).
E. Ventilation blocked.
1) Check air intake and exhaust openings to
be unobstructed.
F. Fan not operating after machine is loaded
down.
1) Check fan thermostat. Check bearings,
disconnect leads and apply motor
nameplate voltage to test.