Operating Modes; On-Line (Run Operation); Static-Bypass (Stop Operation) - Toshiba UNINTERRUPTIBLE POWER SYSTEM 1600XP Installation And Operation Manual

Operating Modes

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. it also
supplies a dC voltage of the proper level to the inverter section. the inverter section generates a high
quality sinusoidal 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
Surge
Absorber

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 because of an overload and that overload condition
ends within a specified period of time then the power flow will be transferred back to the On-Line
mode (run operation) automatically.
•
If the power flow is transferred to the bypass circuit due to an external
power through the bypass to the load and indicate a system fault message.
•
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 system fault
messages on pages
•
If the power flow is transferred to the bypass circuit due to an overload condition (see system warning
messages on pages
circuit back to the inverter circuit after removing the overload if set to do so (AutoreXfer parameter
(Cmd id 662)).
MCCB
Input
Power
Surge
Absorber
1600Xp Series installation and operation manual
Bypass
Input
Fuse
Rectifier/
Line Filter
Chopper
Batteries
Negative Bus
POWER FLOW IN ON-LINE MODE FOR ALL MODELS
53–54).
54–55), then the power flow will automatically transfer from the UPS's bypass
Bypass
Input
Fuse
Rectifier/
Line Filter
Chopper
Batteries
Negative Bus
POWER FLOW IN BYPASS FOR ALL MODELS
*Static Switch
Transformer
Output
Fuse
Inverter
+
* Switches are
–
solid state
devices.
fault the UpS will shut down
*Static Switch
Transformer
Output
Fuse
Inverter
+
* Switches are
–
solid state
devices.
Isolation
Output
Power
Power Flow
Isolation
Output
Power
Power Flow
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