Operating Modes; Static-Bypass (Stop Operation); On-Line (Run Operation) - Toshiba 1600XPi Series Installation And Operation Manual

9

Operating Modes

9.1

Static-Bypass (Stop operation)

If the UPS unit is severely overloaded or develops an internal fault, power flow is automatically switched from the unit's main
circuit to the bypass circuit. Power flow through the bypass is shown in the following illustration. This change-over occurs
automatically in phase in less than one-quarter cycle of the input waveform. The switching period is not long enough to
cause interruptions to occur in most loads.
If the power flow 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 "24.3 System Fault Messages" on page 52).
If the power flow is transferred to the bypass circuit due to an overload condition (see "24.4 System Warning Messages"
•
on page 55), then the power flow will automatically transfer from the UPS's bypass circuit back to the inverter circuit
after removing the overload if set to do so (AutoXfer parameter (Cmd ID 660)).
Input
Power
9.2

On-Line (Run operation)

The following illustration shows circuit power flow when the UPS is operating normally in the On-Line mode. The UPS
rectifier, 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. The inverter section generates a high quality sinu soidal
output voltage. The unit's batteries are always maintained in a constantly charged state when the UPS is in the run operation
mode.
Input
Power
*Surge Absorber is connected as indicated in 3.6–10kVA units. Surge Absorber is connected at the point between the Line Filter and Input Fuse in 14–22kVA units.
1600XPi Series UPS Installation and Operation Manual – 60616-014
MCCB
Line Filter
Surge
Absorber*
POWER FLOW IN BYPASS FOR ALL MODELS
MCCB
Line Filter
Surge
Absorber*
POWER FLOW IN ON-LINE MODE FOR ALL MODELS
Bypass
*Static Switch
Input
Fuse
Rectifier/
Inverter
Chopper
+
Batteries
* Switches are
–
solid state
devices.
Negative Bus
Bypass
*Static Switch
Input
Fuse
Rectifier/
Inverter
Chopper
+
Batteries
* Switches are
–
solid state
devices.
Negative Bus
Isolation
Transformer
Output
Fuse
Output
Power
Power Flow
Isolation
Transformer
Output
Fuse
Output
Power
Power Flow
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