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7
TROUBLESHOOTING & REPAIR
7
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
1. Load bank main power fails to
come on.
2. Blower motor does not operate.
a. Main switch or circuit breaker is not closed.
b. Unit is not connected according to the Schematic/Interconnection dia-
gram.
c. Terminals may be damaged.
d. Fuses may be blown. (Check and replace as required.)
1.
e. Fuse may be blown in load bank control circuit. (Check and replace as
required.)
1.
f. Dirty or loose connection at main power switch.
a. Main switch or circuit breaker may not be closed.
b. Power may not be connected to load bank blower circuit.
c. External power supply may be inadequate.
d. Control Circuit fuse may be blown. (Check and replace as required.)
1.
e. Main power switch may be faulty.
f. Check for loose or broken connections.
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.