3-4
Ultron DPS Series
3.3 Bypass Mode (Single)
LOAD
BYPA.
MAIN
Q3 Switch
Q2 Switch
Q1 Switch
Rectifier Inverter
Circuit
Breaker
Batteries
STS
Q4 Switch
(Figure 3-3: Path of Electrical Power through the UPS in Bypass Mode)
When the inverter encounters abnormal situations such as over temperature, overload,
short circuit, abnormal output voltage and battery depletion, it will automatically shut itself
down to protect the UPS system. Meanwhile, if the UPS detects the bypass AC source is
normal, it will automatically switch to bypass mode to protect the connected critical loads
from power interruption. After the abnormalities mentioned above are eliminated, the UPS
will switch back to normal mode from bypass mode. During bypass mode, LEDs illuminate
as follows.
Fault
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