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1.2.2.3 Bypass Mode
If the inverter overload capacity is exceeded under normal mode, or if the inverter
becomes unavailable for any reason, the static switch will perform a transfer of the load
from the inverter to the bypass source, without interruption to critical AC load. If the
inverter is asynchronous with the bypass source, an interruption would exist in the
transfer from the inverter to the bypass. This is to avoid large cross current due to the
paralleling of unsynchronized AC sources. This interruption is programmable, but the
typically setting is less than 3/4 of an electrical cycle, e.g. less than 15ms on 50Hz system
or less than 12,5ms on 60Hz system. The action of transfer/re-transfer can be done by
the command through the monitor screen.
Figure 1-6 Bypass mode operation diagram
1.2.2.4 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.
Figure 1-7 Maintenance mode operation diagram
Danger
During Maintenance mode, dangerous voltages are present on the terminal of input, output,
neutral, battery and in breakers terminals, even with all switch and the LCD turned off.
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