Operating Modes; Static-Bypass (Stop Operation); On-Line (Run Operation) - Toshiba 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 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 53).
•
If the power flow is transferred to the bypass circuit due to an overload condition (see "24.4 System
Warning Messages" on page 54), 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)).
MCCB
Input
Power
Absorber

10.2 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.
MCCB
Input
Power
Absorber
16
Bypass
Input
Fuse
Line Filter
Surge
Batteries
POWER FLOW IN BYPASS FOR ALL MODELS
Bypass
Input
Fuse
Line Filter
Surge
Batteries
POWER FLOW IN ON-LINE MODE FOR ALL MODELS
1600XP/XPi Series Installation and Operation Manual – 60616-012
*Static Switch
Output
Fuse
Rectifier/
Inverter
Chopper
+
* Switches are
–
solid state
devices.
Negative Bus
*Static Switch
Output
Fuse
Rectifier/
Inverter
Chopper
+
* Switches are
–
solid state
devices.
Negative Bus
Isolation
Transformer
Output
Power
Power Flow
Isolation
Transformer
Output
Power
Power Flow