SP121E Rev. 000 Siel S.p.A. Pag. 7 of 42
Issued date: 2005-05-06
GREEN POINT
The UPS can be configured to automatically restart after a mains supply failure or after the batteries have
become fully discharged. The Auto-Restart function may be delayed using the built-in software.
Cold Start (no battery):
Enables the UPS to be switched on during the absence of the mains supply (optional).
Low impact on the mains power supply
Power factor correction (UPS input factor close to 1):
The UPS absorbs power from the incoming mains supply with a power factor close to 1, even if the systems
supplied by the UPS have a power factor inferior to this. For example, if the UPS supplies a piece of IT
equipment with an input power factor of 0.65, the UPS input power factor will still remain close to 1, ensuring
that any mains supply power factor correction banks are not overloaded.
Sinusoidal absorption (option)
The UPS draws a sinusoidal current from the mains supply, meaning that the system has a very low impact on
the mains supply and, as a consequence, on the other pieces of electrical equipment connected to it.
Maximum battery reliability
The system compensates for any variations in temperature whilst recharging the batteries, as temperature
represents the greatest threat to the overall life and performance of the batteries. The recharge voltage is
temperature dependent – the higher the temperature, the lower the recharge voltage will be. This system
ensures that the batteries operate effectively, efficiently and prolongs their life.
High level of battery reliability (automatic battery test).
The UPS carries out battery tests automatically; these tests enable the system to periodically check the
efficiency of the batteries in order to prevent any faults occurring to them. The test does not in any way
compromise the supply to the connected equipment, and given the short duration (seconds), it does not affect
the life or the back-up time of the batteries.
The period between and the duration of the test can be configured via the control panel, or the test can be
completely deactivated.
The batteries are also protected against prolonged slow discharge. An electronic device automatically
disconnects the batteries if the discharge period is too long (for example when the UPS is operating on back-up
either with no load or with very low loads). This protects the batteries from discharging completely, which
inevitably accelerates the ageing process.
Reduced noise:
The use of high speed IGBT switching technology and controlled ventilation in relation to temperature and load
applied, ensures a very low operational noise with very little impact on the surrounding environment .
Complete self diagnostic capability
The internal event log providing 128 signals, status and alarms all via the standard multilingual LCD display.
The information provided enables the user to accurately identify any problem relating to the system or to the
operating environment (variations in the mains, overtemperature, overloads, etc.).
(134 pages)
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