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5.0
Operating the UPS
5.8
Battery Backup Time
The UPS unit's batteries provide 10 minutes of back-up time for the 2000 through 2400 VA
capacity units. These times are valid when the unit is operating under full load. When the
units are operating at half load, the batteries can power the load equipment about 3 times
longer. The exact length of these times will depend on the UPS model used, condition of
the batteries, amount of load, temperature and other variables. See battery backup time in
the standard specifications Sections 4.1.
5.9
Battery Low Voltage Tolerances
Excessive discharge will cause the UPS unit's battery voltage to drop. 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.
5.10
Battery Check Function
Part of the UPS start-up procedure is an automatic 'Battery Check' to see if a problem
exists in the battery circuit. When the UPS is started it will begin operation in the bypass
mode. An automatic voltage level test of the batteries is made while operating in the
bypass mode for 5 seconds. A failure of this first test will activate visual and audible
alarms (see section 5.4.3 "battery problem"). If this test passes then the UPS will auto-
transfer from bypass mode to inverter operating mode. A 10 second automatic voltage
check of the batteries is made after the UPS has auto-transferred from bypass to inverter
mode. Normal inverter operation continues if the second test passes. If the second test
fails, then the "Fault" LED will flash and up too three additional automatic battery voltage
checks are made at 3 hour intervals while the inverter continues to operate. If the
batteries are found to be normal during one of these three tests then the "Fault" LED
will stop flashing and normal inverter operation will continue. A failure of the third and
final check will activate visual and audible alarms (see section 5.4.3 "battery problem")
causing an auto-transfer back to bypass. If the batteries are indicated "bad" then
STOP the UPS and allow a 24 hour charge on the batteries before restarting.
5.11
System Reset
The UPS is reset by moving the STOP/RUN switch from "run" to "stop" and then back
to "run". Use the reset procedure to transfer from bypass back to inverter after a fault
occurs.
UPS Capacity
in VA
Nominal voltage
in Vdc
Alarm voltage
in Vdc
Shutdown voltage
5 - 7
2000
2400
96
96
84.5
84.5
76.8
76.8
TOSHIBA
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