SP121E Rev. 000 Siel S.p.A. Pag. 5 of 42
Issued date: 2005-05-06
GREEN POINT
The parallel system modification does not require the UPS to be manually calibrated in any way, the calibration
of the systems is handled automatically by the microprocessor digital control system, this controls the exchange
of information and ensures that the load distribution between the various UPS systems is equal. This method of
control noticeably increases the overall reliability and efficiency of the system (it is common knowledge that
most manually calibrated systems tend to degrade over time due to temperature or vibration).
The GREEN POINT can be connected in parallel to increase the total amount of power available from the
system (known as a total power system) or to improve the level of reliability/redundancy, therefore if a fault
occurs to one of the UPS systems the supply to the load will remain supplied by the operational system (known
as a parallel redundant system).
“Digital” reliability
High level of UPS reliability (total microprocessor control).
The digital control system dramatically improves the overall reliability and efficiency of the UPS; resulting in a
reduction in the number of electronic components required, the microprocessor controls and monitors all of the
functions of the UPS from one common control card. The control card can be used across a number of various
systems, even systems in different ranges, thereby increasing the productivity and reliability of the range.
Suitable for any type of load
The system is suitable for powering both IT or industrial loads, thanks to an output power factor of 0.8.
The UPS can provide an active power output rated at Pn x 0.8, and can therefore support industrial loads (which
typically have a high power factor)
Low Power consumption
With an efficiency level of 92%, thanks to the digital control and IGBT technology. This technology enables the
system to considerably reduce the energy wasted. In particular, thanks to the high switching speeds and low
losses of the IGBT (Isolated Gate Bipolar Transistor) used in the inverter output stage, results in a high level of
efficiency even at low loads (the efficiency is hardly effected with loads from 25 to 100% of the rated value). The
reduced number of components within the system further helps to save energy.
“Economy Mode” and “Smart Active Mode” function (for increasing efficiency up to 98%)
Economy Mode:
Enables the user to select the Line Interactive (VI) technology, this mode provides power to non sensitive
loads from the incoming mains supply for certain applications. In the event of a mains supply failure
occurring the load is automatically switched onto the inverter for continued operation. This function can
be programmed via the software or set manually from the UPS control panel. The voltage tolerance for
this function can be set from ± 5% to ± 25% and the frequency from ± 1% to ± 5%.
Smart Active:
Enables the user to allow the UPS to determine which method of operation (on-line or line interactive) is
suitable dependent on the quality of the incoming mains supply. If the mains supply is not within the
acceptable limits for both voltage and frequency, the UPS will supply power to the load from the inverter
(134 pages)
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