Powercom SNT-1000 User Manual page 34

4 .1 General Description
A s double conversion On-line UPS, it can convert clean single-phase power to
s upport your critical system. The diagram of UPS is as shown above.

Input filter reduces transients and interference from the main

With PFC AC/DC, AC-power is rectified and regulated to DC power

DC power is converted to AC in the inverter passing it on to the load
Line-Mode/Battery-Mode
UPS will operate in Line-Mode that supports power and charge battery while
connected to power. During a power failure, the UPS will switch to Battery-Mode, in
which power is maintained from the battery. In case of failure time exceed Battery-Mode
duration, UPS will shut down until voltage return to prevent battery discharge.
Free Run Mode
Free Run Mode provides a wider input frequency range when input frequency
does not match the selected range (user adjustable). Free Run Mode enlarges input
frequency acceptance up to 45Hz ~ 65Hz but fixes output frequency to 50Hz(220V) and
60Hz(110V) with ±0.25Hz. Free Run Mode designs for large power variation. It is
activated in default and can run with Line-mode simultaneously.
High-Efficiency Mode
High-Efficiency Mode designs to minimize power loss and power consumption.
Whenever power is stable, UPS will automatically switch to bypass for efficiency. When
any irregularity is detected, Line-Mode will reactivate immediately. Switching occurs
when the input voltage is outside ±10% of nominal (±15% selectable), input frequency is
outside of ±3Hz, or when no input line is available.
You can also activate this mode from the LCD panel. Refer to UPS configuration
Diagnostic Test
The diagnostic test automatically executes to check and report UPS status. While
the advanced battery management system monitors the conditions of the batteries, it
sends early warnings if a battery replacement is needed. The test performs every 30
days of normal operation. Diagnostic tests can also activate by manual control.
Generator mode
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4 .
Operation
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