−
37
−
(c) Economy mode
The UPS switches to Economy mode when the input power voltage is within a certain
range and the output power factor is above a certain value. In Economy mode, the UPS
receives power from the utility power source and supplies it to the load. At the same
time, the inverter is connected to the load and ready to activate. The batteries are kept
continually charged and ready in case a problem (outage or voltage drop) occurs in the
utility supply.
Power supply route in Economy mode Indications by LEDs
(2) On Failure of Utility Power
When a fault or an outage occurs in the utility power source, the rectifier and charger
cease operating while inverter operation continues, now using the batteries as a DC source
to produce AC voltage, to ensure stable power supply to the load without even a
momentary power dropout. At the same time, the buzzer sounds the battery operation
alarm, and the green INPUT indicator starts blinking.
Power supply route on failure of utility power
Indications by LEDs
(3) Upon Recovery of Utility Power
When normal utility power is restored, rectifier and charger operations resume
automatically, returning to the normal operating state described in §15.1 (1).
(4) When Battery Voltage Declines
When low voltage or an outage in the utility power source continues, causing the battery
voltage to decline to about 45V (1.85V/cell), the red BATT.LOW indicator in the above
figure lights to indicate low battery voltage.
Note: When item
⑫
“Low battery voltage signal timing” in §10.1 “Setup Menu Item List”
is set to “2 minutes” or “3 minutes”, the alarm is issued at the point when the
remaining battery time drops to the specified level.
(5) Extended Power Outage
If a power outage persists and the battery voltage reaches the final discharge level, a
protective circuit shuts off the inverter to prevent over-discharging of the batteries. When
normal utility power recovers after the inverter has been stopped automatically, operation
is automatically resumed, returning to the normal operating state described in §15.1 (1).
Note: When item
⑦
“Restart time” in §10.1 “Setup Menu Item List” is set to “OFF”,
inverter output remains stopped. When it is set to “30%”, “50%”, or “80%”, the UPS
restarts operation once the batteries are charged to the specified level and then
returns to the normal operating state described in §15.1 (1).
Utility
power
Output
Converter
Rectifier
Inverter
Charger
Batteries
Utility
power
Output
Converter
Inverter
Charger
Batteries
Rectifier
