ESAB Migmaster 300i cvcc, Руководство по обслуживанию и ремонту

Страница: 37 / 48

37
TROUBLESHOOTING GUIDE - (Cont)
WELD CONDITION POSSIBLE CAUSE REMEDY
10. Shield gas flow low or a. Cylinder valve closed. a. Turn off regulator, slowly open
stopped. valve, until regulator reaches
35 c.f.h. pressure.
b. Cylinder empty. b. Replace if gauge so indicates.
c. Faulty regulator or adaptor. c. Check flow at outlet; replace
faulty item.
d. Faulty gas solenoid valve. d. Replace solenoid valve.
11. Wire stubs on work a. Controls not set properly for a. Reset controls properly.
while welding. metal gauge, thickness.
12. Wire burns back into a. Contact tip loose. a. Firmly tighten with pliers.
contact tip. b. Tip too close to work. b. Maintain 1/4" (.6 cm) wire
protrusion; hold torch further
from work.
c. Wire feed slipping. c. Increase pressure on pressure
roll by adjusting pressure knob.
d. Contact tip damaged. d. Trim back tip 1/16" (1.6 cm) max.
Replace if still faulty.
e. Voltage setting too high. e. Adjust setting.
f. Drive or pressure roll dirty or f. Clean rolls or replace.
worn.
13. Wire does not feed; a. Kink, etc. in wire, or wire bound a. Straighten; or feed wire until
motor running (drive on reel. clear and cut off.
roll turns). b. Wire freezing to contact tip b. Free freeze, or remove contact
(burnback). tip feed wire until clear cut end
free, and replace tip.
c. Clogged liner. c. Replace liner.
14. Wire does not feed; a. Motor. a. With wire speed dial on 10,
motor NOT running press trigger. If voltage
(drive roll does not turn). appears across motor leads
but motor does not run, check
motor gears and commutator
areas.
b. Power switch S1 and CB1. b. With S1 ON, if voltage across
terminal 1 and 3 is 24 V ac,
switch and fuses are good.
c. Defective PCB1. c. Check board voltages
(Para. 7.1.1).
15. Wire feed does not stop. a. Torch trigger switch. a. Check continuity of torch trigger
circuit; check to see if trigger
lever is stuck in "ON" position.
b. PCB1. b. Check for proper action.
16. Gas continues to flow a. Gas solenoid valve stuck open. a. Tap solenoid or click on and off
after trigger release.
to clear valve.