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The diagram in Figure 2 shows a static bypass switch connected across a UPS. The UPS. could be a double conversion or a delta conversion or rotary type. The static bypass switch. provides a means to accomplish high-speed transfer to the bypass path in case of UPS.
When a UPS is connected to the generator with a transfer switch, the UPS's charger has turned off so that it may begin its power walk-in routine. If the input filter is the only load on the generator, it may provide excess excitation energy.