Tescom TEOS+ 300 Series, User Manual, Page: 12 / 63

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Fig. 2-4 Bypass mode operation diagram
2.3.4 Maintenance Mode (Manual Bypass)
A manual bypass switch is available to ensure continuity of supply to the critical load
when the UPS becomes unavailable e.g. during a maintenance procedure. (See
Fig.2-5).
Fig .2-5 Maintenance mode operation diagram
Danger
During Maintenance mode, dangerous voltages are present on the terminal of input, output and
neutral, even with the LCD turned off.
2.3.5 ECO Mode
To improve system efficiency, UPS rack system works in Bypass mode at normal
time, and inverter is standby. When the utility fails, The UPS transfers to Battery
Mode and the inverter powers the loads.