Lincoln Electric 9535 Operator's Manual page 17

E-5
PROBLEMS
(SYMPTOMS)
H. Machine trips off when under no
load or makes excessive noise
like it is loaded.
I. Variable or sluggish welding arc.
J. Welder will not shut off.
K. Current control on machine not
functioning.
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.
TROUBLESHOOTING
Observe all Safety Guidelines detailed througout this manual
POSSIBLE CAUSE
FUNCTION PROBLEMS
1. Power bridge rectifier may have
a shorted diode or SCR.
2. Short in the transformer.
3. Fan hitting vertical baffle.
1. Poor work or electrode cable
connection.
2. Current too low.
3. Welding leads too small.
4. Open SCR or diode in power
rectifier bridge.
5. Control circuit problems.
1. Input contactor contacts frozen.
1. Current control switch in wrong
position.
2. Current control switch defective.
3. Current control potentiometer
defective.
4. Lead or connection in control
circuit open.
5. Defective control or circuit
boards.
IDEALARC R3R 375-I, 500-I AND 600-I
1. Refer to Power Hybrid,
2. Repair.
3. Clear the fan.
1. Check and clean cable connec-
2. Check recommended currents
3. See Table in Output Connection
4. Check per Power Rectifier
5. See SCR Troubleshooting,
1. Replace input contactor.
1. Place switch in "machine" ( I )
2. Check per Section H.
3. Check per Section G.
4. Repair or connect.
5. See SCR Troubleshooting,
CAUTION
RECOMMENDED
COURSE OF ACTION
Troubleshooting Procedures,
Section J and Snubber, Section
F.
tions.
for rod type and size.
Section.
Bridge Troubleshooting
Procedures, Section J and
Snubber, Section F.
Section K.
position.
Section K.
E-5