This reports whether one or more rectifier modules in the plant have failed, per the description. Because this plant runs multiple rectifier modules in parallel for redundancy, a single failed module may not immediately drop bus voltage, but it does reduce the plant's total charging and current capacity and pushes more load onto the remaining modules. An active(2) status alongside a rising rectifierLoadCurrent-to-capacity ratio signals the remaining rectifiers are now working harder to cover for the failed one.