Pro-Weld CD-512, Operation Manual

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CD -5 1 2
PRO WEL D
17.0 TROUBLE SHOOTING – ELECTRICAL
When troubleshooting the power unit/controller (welder), the following precautions must be observed:
1. Welder must be TURNED OFF!
2. Unplug power cable from welder and wait at least two minutes before checking components.
3. The use of a volt/ohmmeter is recommended where any voltage may be present.
4. Use a continuity tester ( or troubleshooting light) for continuity checks only.
5. Possible causes marked with a star (*) are generally the most common problems.
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
1. Welder does not turn on A. Power connections at Check connections.
and will not weld. Welder or 110 VAC outlet
not complete.
*B. Broken power cable or Check wires for continuity.
loose wire connection in Repair break.
the plug.
C. Fuse blown. Replace fuse.
2. Fuse blows each time *A. Shorted weld capacitor. Check safety vent seal for
unit is turned on. Rupture hole. Replace
defective capacitor.
B. Shorted rectifier (BR1) Check for a short across the
rectifier with ohmmeter.
Replace rectifier module if
shorted.
C. Incorrect primary hookup. Check transformer connections.
D. Shorted transformer Replace transformer.
assembly.
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