TOSHIBA
5.0Operating the UPS
5.7Battery Backup Time
The UPS unit's batteries provide about 5-12 minutes of back-up time depending on the capacity of the UPS. These times are valid when a 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 through 4.2.
5.8Battery 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.
UPS Capacity | 600VA | 800VA | 1000VA |
| | | |
Nominal voltage | 60.0 | 60.0 | 60.0 |
in Vdc | | | |
| | | |
Alarm voltage | 52.8 | 52.8 | 52.8 |
in Vdc | | | |
| | | |
Shutdown voltage | 48.0 | 48.0 | 48.0 |
| | | |
5.9Battery 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 five seconds. A failure of this first test will activate visual and audible alarms (see section 5.3.3 "battery problem"). If this test is passed, then the UPS will auto- transfer from bypass mode to on line operating mode. A ten second automatic voltage check of the batteries is made after the UPS has auto-transferred from bypass to on line mode. Normal on line operation continues if the second test is passed. If the second test fails, then the "Fault" LED will flash and up to 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 5.3.3 "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.
5.10System 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. Some faults may only be cleared by shutting down the UPS, waiting for all LED's on the front panel to go off, and then restarting the UPS.
