E-4
TROUBLESHOOTING
E-4
INVERTEC DC TIG STARTER
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)
RECOMMENDED
COURSE OF ACTION
No HF arcing; OCV not present.
Solenoid(s) does (do) turn on but OCV is
present.
Arc does not start consistently; HF present.
1. Check that the Invertec’s Meter Polarity Switch is in the position
for the electrode connection being used.
2. Check that the RED LED on the control board is not illuminated.
If it is illuminated, replace the control board.
3. If solenoids engage when the arc start switch is closed, check
that 24 VAC is present between leads 2 and 4 with the arc start
switch open and <3 VAC with the arc start switch closed:
a. 24 VAC not present with arc start switch open: check conti-
nuity of input cable assembly and consult the Invertec’s
Instruction Manual.
b. Voltage is not <3 VAC with arc start switch closed; replace
control board.
4. If solenoids do not engage when the arc start switch is closed:
a. Check that the arc start switch has continuity when closed.
b. Check that there is 28-40 VDC between leads D and E.
If voltage is not present between D and E, replace the con-
trol board.
1. With the kit timing postflow, check that 115 VAC is present
between leads B and B to the gas and water solenoids. Replace
the control board if voltage is not present. Replace the sole-
noid(s) if voltage present.
1. Use Thoriated tungsten electrodes. Pure tungsten electrodes
may exhibit starting difficulty.
2. Check continuity of work lead, torch and HF transformer sec-
ondary, T2. Check for tight, clean connections between all out-
put connectors.
