Eaton 93PR Series - Bypass Mode; Figure 2-8: Route of the Electric Energy Running through the UPS in Bypass Mode

Eaton 93PR 15-80 kW UPS
Installation and Operation Manual
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2.2.3. Bypass Mode
If any overload, load error or internal failure is detected, the UPS will switch to bypass mode
automatically. The bypass will supply AC power to the load directly. The UPS can also be
switched to bypass mode manually though the display. On the display, the state of the UPS is
shown as “Bypass Mode”. Figure 2-8 indicates the route of the electric energy running through
the UPS in bypass mode.
CAUTION
The critical load is not protected in bypass Mode.
Internal relay contacts
Figure 2-8: Route of the electric energy running through the UPS in bypass mode
In bypass mode, the 3-phase AC output of the system is supplied by system input directly. In
this mode, the system output cannot avoid uctuation of AC voltage or frequency, or blackout.
In bypass mode, partial lters and transient protection are provided, but power correction and
battery backup are not supported.
The static bypass is composed of a SCR and a SSW. When the inverter cannot support the load,
the static switch will work continuously. As an electronic controller unit, the static switch can be
enabled immediately to replace the inverter in supplying uninterrupted power to the load.