Open Circuit Voltage (Ocv) Issues; Output Problems - Lincoln Electric ASPECT 375 Operator's Manual

ASPECT™ 375

OPEN CIRCUIT VOLTAGE (OCV) ISSUES

Note: Do not connect a meter to machine output terminals to measure voltage in Tig mode as hi-freq produced
by machine may damage meter. When trigger is closed in Tig mode, machine displays OCV on left meter for
approximately 3 seconds then output will turn off if a weld is not made. Machine does not display OCV in Stick
mode even though the output is always on.
SYMPTOMS
OCV is below 10V in
Tig mode
OCV is below 80V in
Tig mode

OUTPUT PROBLEMS

SYMPTOMS
Thermal light turns on
Output No gas &
o.k. in no hi-freq
Stick but
Gas & hi-
no output
freq o.k.
in Tig
No output in both Stick
and Tig
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.
Observe all Safety Guidelines detailed throughout this manual
POSSIBLE CAUSE
Preflow time set too long
Faulty PC Boards or connections
Faulty Components, PC Boards or
Connections
POSSIBLE CAUSE
Welding application exceeds rated
duty cycle
Air intake & exhaust louvers may
be blocked
Dirt and dust may have clogged the
cooling channel inside machine
Faulty fans or connections
Faulty Components, PCB or
Connections
Faulty trigger or hand/foot Amptrol
or connection
Faulty PC Boards or connections
Faulty PC Boards or connections
Set for typical 0.5 second
preflow
Contact your local Lincoln
Authorized Field Service Facility.
Contact your local Lincoln
Authorized Field Service Facility.
Reduce duty cycle
Maintain sufficient clearance
around machine
Blow out machine with clean, dry
low pressure air
Contact your local Lincoln
Authorized Field Service Facility.
Contact your local Lincoln
Authorized Field Service Facility.
Check trigger or Amptrol
connection
Contact your local Lincoln
Authorized Field Service Facility.
Contact your local Lincoln
Authorized Field Service Facility.
CAUTION
E-7
TROUBLE SHOOTING
RECOMMENDED COURSE OF
ACTION
RECOMMENDED COURSE OF
ACTION