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9
TROUBLESHOOTING & REPAIR
9
MASTER LOAD 750
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 the Lincoln Electric
Service Department for technical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.
CAUTION
PROBLEMS
(SYMPTOMS)
POSSIBLE CAUSES/REMEDIES
6. Contactor “chattering” exists.
7. Load bank or load step does not
give rated load.
a. Contacts and/or core may be dirty.
b. Check for loose or faulty connections to the contactor coil.
c. Control circuit line voltage may be too low.
a. Applied load voltage may be either derated or inadequate.
b. Contactor may not be closing properly.
c. Load step resistor element may be open.
1.
When checking fuses for continuity, be sure to remove all fuses from clips (in fuse block or disconnect switch).
Test each fuse individually, out of circuit.