Welding on Refrigeration Units or Containers
Electric welding can cause serious damage to electronic circuits when performed on any portion of the refrigeration unit, genset, container, or container chassis with the refrigeration unit attached. It is necessary to verify that welding currents are not allowed to flow through the electronic circuits of the unit. The procedures below MUST be strictly followed when servicing units to avoid damage or destruction of the microprocessor.
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Disconnect the battery connections (if equipped) and lock out - tag out the unit according to local regulations.
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Disconnect all power to or from the refrigeration unit or genset.
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Disconnect all quick-disconnect wire harnesses from the back of the controller.
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Switch all of the electrical circuit breakers in the control box to the Off position.
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When steps 1 through 5 are complete, weld the unit and/or container using normal welding procedures. Keep ground return electrode as close to the area to be welded as practical. This will reduce the likelihood of stray welding currents passing through any electrical or electronic circuits.
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When welding is complete, restore the unit power cables, wiring, and circuit breakers to their normal condition.