Toshiba 1600XP Power Supply User Manual


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15
1600XP Series Installation and Operation Manual
10. Operating Modes
10.1 Static-Bypass (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 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 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 “24.3 System
Fault Messages” on page 51).
• If the power ow is transferred to the bypass circuit due to an overload condition (see “24.4 System
Warning Messages” on page 52), 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 (AutoXfer
parameter (Cmd ID 660)).
10.2 On-Line (Run operation)
The following illustration shows circuit power ow when the UPS is operating normally in the On-Line
mode. The UPS rectier, 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.
Output
Power
Line Filter Inverter
*Static Switch
Isolation
Transformer
Input
Power
Input
Fuse
Power Flow
Bypass
* Switches are
solid state
devices.
MCCB
Output
Fuse
Surge
Absorber
Batteries
+
–
Rectier/
Chopper
POWER FLOW IN ON-LINE MODE FOR ALL MODELS
Negative Bus
POWER FLOW IN BYPASS FOR ALL MODELS
Output
Power
Line Filter Inverter
*Static Switch
Isolation
Transformer
Input
Power
Input
Fuse
Power Flow
Bypass
* Switches are
solid state
devices.
MCCB
Output
Fuse
Surge
Absorber
Batteries
+
–
Rectier/
Chopper
Negative Bus
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