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6.5 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 (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.
CAUTION
Contact TOSHIBA when using other than TOSHIBA designed Battery Systems
to determine proper compliance. Using other systems could void Warranty and
or Safety Certifications.
The following illustration graphically shows the battery discharge process at full load
conditions.
6.6 Battery Low Voltage Tolerances
Excessive discharge will cause the UPS battery voltage to drop bellow tolerable levels. The
chart shown below lists the voltage level at which each UPS unit's low-voltage alarm will
sound, and also at what level the low-voltage condition will cause the unit to automatically
shut down.
Models 15/25/30/50 kVA
Nominal Voltage 288 VDC
Alarm Voltage 252 VDC
Shutdown Voltage min. 216 VDC
4200FA CT/XT User’s Manual 40