Battery Backup Mode; Battery Backup Time And Discharge Process - Toshiba 4200 series Operation Manual

6.1.3

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 (inverts) 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 shutdown voltage minimum (V min). The rated battery voltage chart on
page 22 shows (V min). The battery backup time and discharge process is explained
in Section 6.2.
Power flow in battery backup mode for the 75 and 100 kVA models
6.2

Battery Backup Time and Discharge Process

The UPS system, when used in conjunction with a Toshiba designed Battery System, is
designed to provide several minutes of back-up time for the 75, 100 kVA models (Refer to the
Battery System Manual for back-up times). These times are valid when the unit is operating
under full load. When these models are operating at half load, the batteries can provide
approximately 2 times the specified value. The exact length of these times will depend on the
UPS model used, condition of the batteries, amount and type of load, temperature and other
variables.
Contact Toshiba when using other than Toshiba designed Battery Systems to
CAUTION
determine proper compliance. Using other systems could void Warranty and or
Safety Certifications.
TOSHIBA
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