Lincoln Electric IM697 RED-D-ARC MX 300 - Manual (Page 22)

E-2 TROUBLESHOOTING E-2
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 Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
CAUTION
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
Machine completely dead:
Input contactor does not pull in,
meters are off.
Meter turns on but input contator
does not pull in.
Machine has no output:
Thermal light comes on.
No output:
1. Check cable connections from (+)
Input and Work to power source
for loose or faulty connection.
2. Input voltage may be too low.
Measure input voltage to
machine, should be 50 – 113
VDC.
3. The power switch may be faulty.
4. The DC Buss Power Supply PCB
or its connections may be faulty.
5. The Analog Control Power Supply
PCB may be faulty.
6. The Weld Control PCB may be
faulty.
1. Check input voltage, should be
less than 113 VDC.
2. Remote receptacle output switch-
ing enabled. Check if jumper is
open on plug P21. (Refer to wiring
diagram).
3. The contactor or supply voltage to
contactor coil may be faulty.
4. The connections at PCB connec-
tors inside the control box may be
faulty.
5. The Peripheral PCB may be
faulty.
6. The Weld Control PCB may be
faulty.
1. Thermal shut down. Wait until
machine cools down and thermal
light goes out. Do not overload
machine.
2. The thermostat or imbalance pro-
tector or Peak Input Voltage
Protection (if present) or their con-
nections may be faulty.
If all recommended possible areas of
misadjustment have been checked
and the problem persists, Contact
your local Authorized Field
Service Facility.
RED-D-ARC MX350