24
1600EP Series Instruction Manual
Online Mode
Online Mode (Run operation)
The following illustration shows circuit power ow when the UPS is operating normally in the Online
mode. The UPS rectier, including a boost chopper circuit, converts AC input power to DC power. The
boost chopper circuit maintains a constant voltage, with current limiting, for charging the batteries. It also
supplies a DC voltage of the proper level to the inverter section. The inverter section generates a high
quality sine wave output voltage. The unit’s batteries are always maintained in a constantly charged state
when the UPS is in the run operation mode.
Static-Bypass Mode (Stop operation)
If the UPS unit is severely overloaded or develops an internal fault, power ow is automatically switched
from the unit’s main circuit to the bypass circuit. Power ow through the bypass is shown in the following
illustration. This change-over occurs automatically in phase in less than 4 milliseconds. The switching
period is not long enough to cause interruptions to occur in most loads.
If the power ow is transferred to the bypass circuit because of an overload and that overload condition
ends within a specied period of time then the power ow will be transferred back to the Online mode
(run operation) automatically.
If the power ow is transferred to the bypass circuit due to an external fault the UPS will shut down
power through the bypass to the load and indicate a system fault message.
If the power ow is transferred to the bypass circuit due to an internal fault the UPS will continue to
supply power to the load through the bypass and indicate a system fault message (see system fault
message DC-OC on page 43).
If the power ow is transferred to the bypass circuit due to an overload condition (see system warning
message on page 39 and AUTO RETRANSFER on page 41), then the power
ow will automatically transfer from the UPS’s bypass circuit back to the inverter circuit after removing
the overload if set to do so (see auto-transfer setting on page 35).
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POWER FLOW IN ONLINE MODE FOR ALL MODELS
POWER FLOW IN BYPASS MODE FOR ALL MODELS
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