RED-D-ARC E500
RED-D-ARC E500
RED-D-ARC E500
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D-7<br />
TROUBLESHOOTING<br />
D-7<br />
Low output, low OCV, or erratic welding<br />
Turn control pot. to minimum<br />
Check OCV<br />
OCV is 35-55V OCV is 40-45V OCV is 0 Rated OCV but OCV less than rated<br />
erratic welding but more than 55V<br />
OCV 45-55V OCV 35-45V Possible machine Check leads 76, 77, Possible Loose lead Possible intermittent Possible Possible wrong connection Possible defective<br />
is being 212, 213, 210, 211 defective connections or loose connections defective of gate leads if recent PC board<br />
single phased & SW2 for open PC board on shunt in control circuit. PC board PC board or rectifier<br />
Check aux. voltages Check PC board con- stack change.<br />
on PC board nector, switches,<br />
potentiometers, etc.<br />
201-202 = 120V ± 10% Replace Retighten Replace See wiring diagram Replace<br />
201-202 = 120V ± 10% leads and correct<br />
202-203 = 120V ± 10% Remove and replace Gate leads<br />
G-1, G-2, G-3 from PC board<br />
one at a time.<br />
If aux. voltages<br />
are incorrect, If aux. voltages If removing each gate lead If removing and replacing<br />
check & repair. are OK one at a time changes OCV each gate lead one at a<br />
time does NOT change OCV<br />
Codes below 9500<br />
with power off, remove leads from Identify gate lead that, when<br />
Codes above 9500 75, 76, 77 terminal strip and removed, OCV did not change.<br />
with power off, disconnect welding leads from output terminals Remove gate lead. Voltage<br />
remote control amphenol between gate lead and 204 must be 13-17V.<br />
and welding leads from<br />
output terminals.<br />
Check resistance of each If voltage OK If voltage is<br />
terminal on this terminal not correct<br />
strip to ground. Resistance<br />
Check the following pins must be as follows: Defective power SCR<br />
for resistance to ground. 75-GND 2K minimum Possible defective<br />
Resistance must be as 76-GND 2K minimum PC board<br />
follows: 77-GND 12K minimum Replace<br />
75-GND 2K min.<br />
76-GND 2K min. Replace.<br />
77-GND 12K min.<br />
If not, clear terminal strip If resistance is OK,<br />
and leads, and also check possible defective<br />
If not, examine amphenol SW2 and R1 for dirt. PC board.<br />
assembly for faults.<br />
If fault found, repair or If amphenol OK, possible<br />
replace amphenol assembly. defective PC board.<br />
<strong>E500</strong>
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