SP121E Rev. 000 Siel S.p.A. Pag. 6 of 42
Issued date: 2005-05-06
GREEN POINT
(on-line). When the mains supply returns to within the acceptable limits, the system will first ensure that
the supply remains stable, before switching the load back onto the mains supply.
During both of these operating modes, the load is powered directly from the mains supply via the bypass.
However, due to the EMI filters in both the input and output, the mains supply is filtered and therefore free of
any electrical disturbances.
If the incoming mains supply fails, the load is supplied directly by the inverter. This function reduces energy
consumption as when the mains supply is present, the inverter is off.
Flexibility of operation
Daily timer:
Enables the user to configure the UPS operational times on a daily basis, thus optimising the power
consumption with respect to the time of day and importance of the load applied. This is configurable from the
control panel or via software.
Emergency Stand-by function
The GREEN POINT can function as an emergency stand-by device. This particular operating mode is
configurable from the control panel, and enables the supply to emergency lighting. The UPS remains off under
normal operating conditions and only activates the output when the mains power supply fails.
The inverter switches on within 320ms in accordance with the current regulations, which stipulates a maximum
delay time of 500ms, the inverter starts up gradually, thus preventing any sudden current surges.
This operating mode enables considerable energy savings, as the inverter is off under normal conditions and
therefore does not consume any energy. In addition, the system does not need to be over-sized, as the gradual
start up of the inverter prevents any current surge problems that might otherwise occur.
Auto-off function:
This function is programmable from the front control panel, and enables the system to automatically switch the
load onto the by-pass line when the connected load on the UPS falls below a preset value (configurable). This
mode reduces the energy wasted by switching the inverter stage off when the system is powering non-critical
loads. When the load is increased the UPS returns to on-line mode. This function is also useful for avoiding
unnecessary deep battery discharges, where there is no load connected during a mains supply failure.
Frequency auto sensing:
The UPS automatically selects the output frequency based on the input frequency ( 50 – 60 Hz )
Frequency converter function:
The UPS can be configured to function as a frequency converter, therefore when the input frequency is 50Hz the
output frequency can be 60Hz and vice versa. During this mode of operation the automatic by-pass is
deactivated.
Auto-Restart:
(134 pages)
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