SP121E Rev. 000 Siel S.p.A. Pag. 18 of 42
Issued date: 2005-05-06
GREEN POINT
emergency power off (EPO) as standard (see interface section)
5) Slot for network interface or other communications cards
The expansion slot enables the user to insert additional communications devices such as SNMP interfaces
(network adaptor card) or an auxiliary RS232 interface card/duplexer.
6) Control and display panel
The control and display panel provides the user with all of the visual (LED and LCD) and acoustic (buzzer)
signals regarding the operational status of the UPS. This panel also enables full control, monitoring, diagnosis
and personalisation of the UPS through the easy-to-use menu system accessed on the panel (refer to the
control panel section).
7) Input/output filters
During Normal Operation, the input/output filters eliminate high frequency disturbances and protect both the
UPS and the connected loads from any mains borne disturbances. These filters also ensure that any
disturbances created by the UPS or the connected loads do not affect any other user.
During both “Line interactive” and “By-pass” modes, the filters ensure that the connected loads are constantly
protected against disturbances from the mains power supply.
8) Converter (input stage)
During Normal Operation mode, the converter changes the mains AC voltage into a constant DC voltage,
suitable for both the inverter and the battery charger. When the mains supply is absent, it takes power from the
batteries, to provide the inverter with a constant voltage.
In the single-phase output versions the converter may either be connected to a 230V single-phase supply or
400V three-phase with neutral supply. The option of either a single or three-phase power supply can be made
during the installation.
The converter operates as a PFC (Power Factor Correction) device, providing an input power factor close to 1.
The UPS therefore has a correction element, which directly benefits the electrical system, therefore no
correction capacitors are required.
9) Inverter (output stage)
The inverter converts the direct current into a stable sinusoidal alternating current, which is used to power the
load. The load is always powered by the inverter when the UPS is in “on line” mode.
The inverter is single-phase , based on IGBT (Isolated Gate Bipolar Transistor) technology. The IGBT enables
high switching frequencies (up to 20kHz) thus reducing power consumption and audible noise levels (in
general, noises above a frequency of 16KHz are practically inaudible to the human ear).
10) Static by-pass
This device automatically switches the power supplied to the load between the inverter and the by-pass line and
vice versa. It consists of static (SCR) components that ensure zero switching time.
(134 pages)
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