Paralleling DC Constant Current Welding Power sources

Paralleling DC Constant Current Power Sources:


Two or more DC transformer/rectifier or inverter power sources can be paralleled as follows:

1. Each power source to be paralleled must be individually protected (fused). For transformer/rectifier units, all must be connected to the same primary input power feed and be connected the same phase to phase.
2. Power sources must all be connected for the same polarity. If the power sources are equipped with polarity
switches, they must all be set for the same polarity.
3. If the power source has various output terminals such as High and Low (range), use the same range terminal on all power sources connected in parallel.If the power sources are equipped with a range switch, the range switch on all paralleled power sources should be in the same range.
4. Amperage adjustment controls on all power sources should be adjusted to provide the same output. Do not split the load unevenly. For example, if 600 amps are required from a paralleled connection of two power sources,adjust amperage control of each power source to provide 300 amps.
5. The amperage being used and total length of cable must be considered when selecting cable sizes.