The SANUPS E11B series comes with two modes, namely, a Double Conversion mode and Economy mode. The modes can be used differently depending on the settings. When the setting is fixed to Double Conversion mode, the inverter always supplies high-quality power. When set to automatic, the UPS will switch between the Double Conversion mode and Economy mode depending on the state of the input power, achieving both the high-quality power and energy savings.

Normal Operation

During normal operation, the UPS automatically switches* to the modes of (a) and (b) below according to the power supply status.

* When the “UPS Operation Mode” in the setting menu is set to “Fixed to Double Conversion”, the mode does not switch.

Double Conversion mode (High-quality power mode)

SANUPS E11B Double Conversion modeThe UPS switches to Double Conversion mode when the power supply voltage is outside a set range. In Double Conversion mode, 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 utility power source. The batteries are kept continually charged by the charger and ready in case a problem (power outage or voltage drop) occurs with the utility supply.

Economy mode (High-efficiency mode)

SANUPS E11B during a power grid failureThe UPS switches to Economy mode when the power supply voltage is within a set range. In Economy mode, utility power is received and supplied to the load. The batteries are kept continually charged by the charger and ready in case a problem (power outage or voltage drop) occurs with the utility supply.

When Utility Power Fails

SANUPS E11B Economy modeWhen a failure or power outage occurs at the utility power source, the rectifier and charger stop operating while inverter operation is started, now using the batteries as a DC source, to ensure stable power supply to the load without even a momentary power dropout. At the same time, the buzzer sounds and [INPUT (green)] starts blinking.

When Battery Voltage Drops

When a failure or power outage at the utility power source continues, the battery voltage drops to approximately 22 V or less*, and [BATT.LOW (red)] is lit on the display.

*When “Setting the Timing of Low Battery Voltage Signal” in the setting menu is set to “1 minute” or “2 minutes”, a warning occurs the moment that the remaining battery time reaches the set value.

When Utility Power Recovers

When normal utility power is restored, rectifier and charger operations resume, automatically returning to operation in the normal operation state described in (1).

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, operation is automatically resumed*, returning to the normal operation state described (1).

*When “UPS Operation Upon Power Recovery” in the setting menu is set to ìOFFî, inverter output remains stopped. Additionally, when the value is set to “30%”, “50%”, or “80%”, operation resumes the moment that the batteries are charged to the set charge level, and the mode automatically returns to the mode during normal operation indicated in (1) in accordance with conditions.

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