Characteristics
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(1) Normal operation
The UPS converts AC power from the utility power source
into DC power through the rectifier, and reconverts this DC
power back into AC power through the inverter and supplies
it to the load. The output power is stable AC power
synchronized with the input power source. The batteries are
kept continually charged and ready in case a problem (outage
or voltage drop) occurs in the utility supply.
(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 “Orange BACK UP” indicator starts lighting.
(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 §19.1 (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
22 V (1.85 V/cell), the “Red BATT.LOW” indicator lights to indicate low battery voltage.
* When “Low Battery Voltage Warning Timing” in the user setting menu 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 §19.1
(1).
* When “UPS Operation Upon Power Recovery” in the user setting menu 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 §19.1 (1).
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(1) Overload protection
If the UPS output is overloaded by exceeding the current
capacity of the inverter, such as when a computer system
boots up, the output selector automatically switches the
source of AC power from the inverter to the bypass circuit,
without interruption.
After a certain period of time has elapsed, the source of power
to the load is switched back to the inverter without
interruption (auto-return), as shown in §19.1(1).
* When “Overload Recovery Operation” in the user setting menu is set to “Bypass”, the UPS switches to inverter
power supply without interruption when the overload is resolved.
(2) UPS fault protection
If a fault occurs in the UPS, the output selector activates automatically and switches to bypass power without
interruption. The “Red ALARM” indicator lights, and the alarm buzzer sounds. The power supply route is the same as
for an overload.
Output from the UPS will stop if a power outage occurs during bypass operation due to the UPS fault. Contact your
supplier or SANYO DENKI as soon as possible.
Utility
power
Output
Converter
Rectifier
Inverter
Charger
Batteries
Utility
power
Output
Converter
Inverter
Charger
Batteries
Rectifier
