Lincoln Electric SVM188-A Service Manual page 44

F-4
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The Machine is dead - The Input
contactor does not operate.
Input contactor (CR1) chatters.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely,
contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed.
Call 1-888-935-3877.
TROUBLESHOOTING AND REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. Check for blown or missing
fuses in input lines.
2. Check the three phase input line
voltage at the machine.
input voltage must match the
rating plate and reconnect
panel.
1. The input line voltage may be
low. Check all three phases.
2. Make sure input line voltage
matches machine rating and the
reconnect panel is connected
correctly for the line voltage
CAUTION
DC-600
RECOMMENDED
COURSE OF ACTION
1. The ON/OFF Switch (S1) may
be faulty
2. The Control Transformer (T2)
The may be faulty.
Control Transformer Test.
3. The primary or secondary ther-
mostats may be open. Check or
replace. Also check the associ-
ated wiring. See the Wiring
Diagram.
4. The pilot relay (CR2) may be
faulty. Check or replace.
5. The input contactor coil may be
open.
6. The Control Board may be
faulty. Perform the Control
Board Test.
1. The pilot relay (CR2) may have
bad contacts. Check or replace
relay.
2. Check for loose or faulty wiring
between pilot relay (CR2) and
input contactor (CR1) coil con-
nections.See Wiring Diagram.
3. The input contactor (CR1) may
be faulty.-Replace.
F-4
Perform the