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4.5.5. ECO mode
In addition to normal mode and bypass mode, it is possible to acti-
vate ECO mode in order to obtain greater overall system efficiency
than normal mode. The downside is that the degree of protection
for critical loads will be lower than normal mode (although greater
than bypass mode).
In this operating mode, the output voltage is supplied by the static
bypass via the emergency (or bypass) line, and the inverter con-
verter will be stopped and ready to restart and connect to the
output when a bypass voltage outside of the programmed ranges
is detected.
In the moments of transition (automatic transfer of the
output: from the bypass to the voltage generated by the
inverter), voltage dips can occur at the output of a few millisec-
onds (from 2 to 4 ms) that the critical loads must be capable of
Fig. 16. Flujo de energía del SAI en modo ECO.
4.5.6. Frequency converter mode
When operating in this mode, activated by configuration, the
unit supplies a fixed output frequency of 50 or 60 Hz, which may
be different to the input frequency. It consists of an operating
mode derived from normal mode, as double conversion is per-
formed, AC/DC rectifier and DC/AC inverter running.
Fig. 17. UPS power flow in frequency converter mode.
USER MANUAL
tolerating in order to make ECO mode viable. In addition, it must be
taken into account that some of the bypass line disturbances can
reach critical loads in a "transparent" way, either because they
cannot be detected or due to the delay in their detection and the
connection of the inverter to the output.
The increase in efficiency (about +2%~3%) is due to the fact that
while the bypass line is connected to the output, the inverter is
stopped, therefore the conduction and switching losses of this con-
verter are avoided.
Even when in bypass, the rectifier will remain in operation, with the
aim of the DC bus being within the operating ranges of the inverter,
allowing a quick intervention of the latter. In turn, the charger will
carry out periodic start-stop cycles for greater efficiency of the
system averaged over time, always monitoring the possible self-
discharge of the batteries and recharging them when necessary.
When operating in this mode, the UPS static bypass is disabled,
and may not even be physically present in the unit construction
(if a frequency converter has been specifically ordered from the
factory). The manual bypass switch (if present) should also not be
actuated due to the possible impact on the loads connected at the
output.
SLC CUBE4 7,5 kVA a 20 kVA - UNINTERRUPTIBLE POWER SOIRCE (UPS)-
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