Lincoln Electric IM318 IDEALARC DC1500 - Manual (Page 19)

E-3 TROUBLESHOOTING E-3
IDEALARC ® DC-1500
Observe all Safety Guidelines detailed throughout this manual
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
Machine does not have maximum
output.
Machine has output but trips off
immediately.
Variable or sluggish welding arc.
Machine will not shut off.
1. One input fuse blown.
2. One phase of main transformer
open.
3. Faulty “Control/Fault Protection”
or “Firing Circuit” P.C. boards.
4. Output control potentiometer
defective.
5. Output control potentiometer
leads open 226, 237, 236, 73, 74,
76, 77.
1. Machine has either an internal or
external short circuit on the out-
put.
2. Faulty “Control/Fault Protection”
P.C. board.
3. Machine output voltage applied to
control leads.
1. Poor work or electrode connec-
tion.
2. Welding Cables too small.
3. Welding current or voltage too
low.
1. Input contacts frozen.
2. Pilot relay contacts stuck closed.
1. Check and replace if blown after
checking for reason for blown
fuse.
2. Check for open and repair.
3. All light emitting diodes must be lit
on both P.C. boards, except L4
on “Control/Fault Protection”
board.(See “P.C. Board
Troubleshooting Guide.”)
4. Check and replace if faulty.
5. Check and repair broken leads.
1. Check internally and externally for
any shorts and remove or repair.
2. If no short circuits, LED L4 must
be lit (See “P.C. Board
Troubleshooting Guide”).
3. Check control cable or wire feed-
er for shorted or grounded control
leads.
1. Check and clean all connections.
2. Check Suggested Copper Cable
Sizes in the table of the Instalation
Section.
3. Check procedures for recommend-
ed settings.
1. Check for approximately .13 inch
over travel of contacts.
2. Check and replace if necessary.