TOSHIBA
6.0 Operating the UPS
6.9 Operation Modes (Cont'd)
6.9.3 Battery Backup Mode
The following illustration shows power flow during the battery backup mode.
When commercial ac power failures occur, the UPS's batteries instantly begin
supplying dc voltage to the UPS's main inverter circuit. This circuit changes
(converts) the dc power into ac power. The ac power is available at the unit's
output. This back-up process will continue until the UPS's battery voltage drops
below a specific minimum level. When this occurs, the batteries will stop
supplying power to the load. This minimum level is the rated minimum voltage
(Vmin). The rated battery voltage chart on page 6-4 (see Section 6.6 for battery
backup time and discharge process) shows (Vmin).
6 - 6
Inverter
Power flow
Power flow in battery backup mode for the 2.4, 3.6, 6 and 8 kVA Models
6.10 Audible Alarm Functions
Audible alarms will sound when the UPS unit is in the battery backup mode, has low
battery voltage, or is in an overloaded condition. The following chart shows the audible
alarm pattern durations for each condition. Time units are shown in seconds. The audible
alarm, for overload and faults only, can be stopped by pressing BUZZER RESET on
the front panel (see Front Panel Buzzer Reset Section 6.13.3).
Surge
absorber
Rectifier/
charger/
chopper
Line
filter
Input
power
MCCB
*Static
switch
Isolation
Transformer
Batteries
* Switches are
solid state devices
Output
power
Bypass
1 S60 S
Audible PatternCondition
UPS in battery
backup mode
(battery voltage:
100% - 92%)
UPS low battery
voltage (voltage
less than 92%)
Overload
Fault
0.5 S 0.5 S
0.5 S 0.5 S
1 S1 S
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