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4200FA Installation and Operation Manual 61
Battery Backup Time and Discharge Process 8.5
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.
Figure 8-5 Battery Discharge Curve
Battery Low Voltage Tolerances 8.6
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
Nominal
Voltage
Alarm Voltage
Shutdown
Voltage
15/25/30/50 kVA 288 VDC 252 VDC 216 VDC