Modes Of Operation; Normal Mode; Buck/Boost Mode; Battery Mode - Sola Hevi Duty S3K2U series Handbuch

7.0 M O
ODES OF
7.1

Normal Mode

During Normal mode operation, the S3K2U supplies conditioned, computer-grade power to the con-
nected equipment: mains power passes through the TVSS circuitry and the EMI/RFI filters and then
through the Inverter (1000VA & 1440VA) / Bi-Directional Converter (2200VA & 3000VA) to con-
nected equipment.
When the UPS is in Normal mode, the AC Input Indicator illuminates green. The UPS display in
Figure 13 shows the UPS operating in Normal mode with 26% - 50% load connected to the output.

Figure 13 Normal mode operation with 26-50% load

Mains power present ...
... and within operational limits
The S3K2U continuously monitors the batteries to maintain them in a fully charged state. The bat-
tery charger operates whenever AC power is present, even if the UPS is switched Off. By default, the
UPS is set to perform an automatic battery test after it has been operating continuously for two (2)
weeks. The automatic battery test can be disabled via MultiLink.
7.2

Buck/Boost Mode

The Automatic Voltage Regulator (AVR) circuitry compensates for fluctuations in mains power, such
as voltage surges and sags. When the S3K2U detects an abnormality, it raises the undervoltage
(boost) or lowers the overvoltage (buck) as needed. The AVR operates automatically and maintains
the output voltage to the connected critical equipment, without utilizing the batteries.
The Buck/Boost Indicator flashes green when the UPS is operating in Buck mode and illuminates
green when the UPS is operating in Boost mode (see 11.0 - Troubleshooting for details).

Figure 14 Buck/Boost mode operation with 51-75% load and 21-40% battery capacity

Indicator shows
UPS in Boost Mode
(solid green)
7.3

Battery Mode

The UPS switches to Battery mode in the event of an extreme input voltage/frequency condition or
complete mains failure. The battery system supplies power through the Inverter (1000VA & 1440VA)
or through the DC-to-DC converter to the Bi-Directional Converter (2200VA & 3000VA) to generate
power for the connected equipment.
PERATION
21

Modes of Operation