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9395P 250 kVA / 275 kVA / 300 kVA
User’s and Installation Guide
Figure 6-4. Path of current through the UPS in Energy Saver System
If the bypass source falls outside of a predetermined voltage or frequency window, the system forward
transfers to Battery mode and then to Normal mode with the inverter assuming the load. The transfer
takes place with a 2 ms typical transfer time, to ensure loads being fed by the system output are not
interrupted. All forward transfers transfer to Battery mode before returning to Normal mode.
Energy Saver mode is a normal operating mode, and not an alarm condition. While the UPS is in this
mode, the
NORMAL
light on the front display will illuminate.
6.2.6 Battery mode
The UPS automatically transfers to battery mode if a utility power outage occurs, or if the utility power
does not conform to specified parameters. In battery mode, the battery provides emergency DC power
which is converted to regulated output power by the inverter.
Figure 6-5 shows the path of electrical power through the UPS system when operating in battery
mode.
NOTE
On a UPS configured as an IOM, the bypass input, static switch, and K5 are not present.
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