Online Mode; Ac Input Mode (Run Operation); Static-Bypass Mode (Stop Operation) - Toshiba 1600EP SERIES Instruction Manual

Online Mode

AC Input Mode (Run operation)

The following illustration shows circuit power fl ow when the UPS is operating normally in the AC input
mode. The UPS rectifi 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. 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.
MCCB
Input
power
Surge
absorber
Static- Bypass Mode (Stop operation)
If the UPS unit is severely overloaded or develops an internal fault, power fl ow is automatically switched
from the unit's main circuit to the bypass circuit. Power fl ow through the bypass is shown in the following
illustration. This change-over occurs automatically in less than 4 milliseconds in phase. The switching
period is not long enough to cause interruptions to occur in most loads. If the power fl ow is transferred to
the bypass circuit because of an overload and that overload condition ends within a specifi ed period of
time then the power fl ow will be transferred back to the AC input mode (run operation) automatically. If
the power fl 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 fl 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
fl ow is transferred to the bypass circuit due to an overload condition (see system warning message OL:
REDUCE LOAD on page 44
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
MCCB
Input
power
Surge
absorber
1600EP Series Instruction Manual
Bypass
Input
fuse
Rectifier/
Line Filter
Chopper
Batteries
Power Flow in AC input mode for all models
POWER FLOW IN AC INPUT MODE FOR ALL MODELS
and AUTO RETRANSFER on
page 40).
Bypass
Input
fuse
Rectifier/
Line Filter
Chopper
+
Batteries
_
POWER FLOW IN BYPASS MODE FOR ALL MODELS
*Static
switch
Output
fuse
Inverter
+
*Switches are
solid state
_
devices
page 46), then the power fl ow will automatically
*Static
switch
Output
fuse
Inverter
*Switches are
solid state
devices
Isolation
Transformer
Line Filter
Power flow
page 48). If the power
Isolation
Transformer
Output
Line Filter
power
Power flow
Output
power
29