Toshiba 1600EP Series manual Operating the UPS, Battery Backup Time and Discharge Process, 100%

Operating the UPS

Battery Backup Time and Discharge Process

The UPS batteries provide about 5-7 minutes of back-up time depending on the 1600EP unit kVA rating. These times are valid when the unit is operating under full load and at the rated power factor. 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. See battery backup time in ‘Standard Specifications’ beginning on pages 15-20.

The following illustration graphically shows the battery discharge process at full load conditions.

Current voltage

imax

imin

vnom
vlow		shutdown
vmin
100%	20%	0%
	battery capacity

Battery Low Voltage Tolerances

Excessive discharge will cause the UPS battery voltage to drop. The chart shown below lists the voltage level at which each UPS low-voltage alarm will sound and at what level the low-voltage condition will cause the unit to automatically shut down.

UPS Capacity	3.6 kVA-	3.6 kVA	6 kVA	8 kVA	10 kVA	14 kVA	18 kVA	22 kVA
	RoHS
Nominal voltage (Vnom)	144 Vdc	216 Vdc	216 Vdc	288 Vdc	288 Vdc	288 Vdc	288 Vdc	288 Vdc
Alarm voltage (Vlow)	130 Vdc	192 Vdc	192 Vdc	246 Vdc	246 Vdc	246 Vdc	246 Vdc	246 Vdc
Shutdown voltage (Vmin)	114 Vdc	170 Vdc	170 Vdc	227 Vdc	227 Vdc	227 Vdc	227 Vdc	227 Vdc

1600EP Series Instruction Manual 21