Battery Backup Time And Discharge Process; Battery Low Voltage Tolerances - Toshiba 4200FA CT/XT User Manual

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
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.
Nominal Voltage
Alarm Voltage
Shutdown Voltage min.
4200FA CT/XT User's Manual
TOSHIBA
Contact TOSHIBA when using other than TOSHIBA designed Battery Systems
to determine proper compliance. Using other systems could void Warranty and
or Safety Certifications.
Models 15/25/30/50 kVA
288 VDC
252 VDC
216 VDC
40