6. UPS DESCRIPTION
The UPS can be operated in four main operating modes: ON-LINE, FREQUENCY CONVERTER, ECO MODE and
SMART ACTIVE and in their main variants described in following paragraph.
Mode: ON-LINE
Normal Operation: the rectifier, drawing power from the mains power supply, supports the Inverter and charges
the batteries; the load is powered by the Inverter which provides a clean and secure supply, synchronised to the
bypass supply.
Emergency Operation: if the mains power supply wanders outside the permitted input range (voltage and
frequency), the rectifier is shut down and the Inverter is automatically powered by the battery set for the preset
back-up time and without disruption to the load. When the mains power supply returns, the rectifier gradually
starts up, charging the batteries and eventually powers the Inverter.
Operation from By-pass: if an Inverter overload exceeds permitted limits, or is manually shutdown, the load
automatically transfers to the emergency bypass via the static switch and without disruption to the load.
Mode: FREQUENCY CONVERTER
The UPS can be configured as a frequency converter (with “UComGP”), therefore when the input frequency is
50Hz the output frequency can be 60 Hz and vice versa. During this mode of operation the automatic by-pass is
disabled. The UPS can work in frequency converter mode with or without the batteries (must be set up with
“UComGP”).
Mode: ECO
The load is normally powered from the emergency bypass supply and the rectifier maintains battery charge.
When the mains power supply wanders outside the permitted input range, the load is automatically transferred
to the output of the Inverter until the mains power supply returns within range.
This mode is useful when powering loads that do not require the regulated no-break supply from the Inverter and
allows the system to achieve an efficiency up to 99%.
Mode: SMART ACTIVE
When the UPS is configured to operate in SMART ACTIVE mode, it automatically selects whether to operate in
ON-LINE or ECO mode.
The decision is made based on statistical calculations performed by the UPS and based on the quality of the
mains and bypass supplies: if the latter remains suitable for a certain period, the unit selects ECO mode,
otherwise it remains in ON-LINE mode.
Note: Multi Sentry working in parallel configuration, may not operate in Eco mode and Smart Active mode.
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