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3.3. SYSTEM DESCRIPTION.
3.3.1. Operating principle.
The UPS SLC TWIN series is a double conversion system AC/DC –
DC/AC, with battery. This structure is the one that provides a higher
reliability and protection to the output electrical power supply in
small and medium UPS power rates.
The input AC voltage is converted to DC by means of a diodes recti-
fier of full wave. The rectifier output is connected to the input of the
Power Factor Corrector (hereafter PFC).
The PFC boosts the DC voltage to optimal levels so the inverter
converts that DC voltage into an AC sinewave voltage, which is
stabilized in voltage and frequency, and ready to feed the loads.
The batteries are connected to the PFC input through a thyristor of
medium power, for those cases that their energy is needed (mains
fault or energy with poor quality).
The battery charger takes the energy from the PFC output (for
equipments with standard autonomy), and adapts it to the optimal
levels of the battery bank to charge.
This double conversion structure is complemented with a bypass
switch. The bypass switch is made by two relays, one for the by-
pass line and the second one (contactor depending on the power)
for the inverter line, connects the output load with the bypass line
directly in those special conditions like overloads, overtempera-
tures, etc. And they are connected to the inverter again when the
normal conditions are restored.
3.4. OPTIONAL.
Depending on the chosen configuration, your equipment could in-
clude any of the following optional:
3.4.1. Integration into IT networks through the SNMP
adaptor (C16).
The big IT systems based on LANs and WANs that make up servers
with different operating systems has to include the control and
management help at the managing system disposal. This help is got
through the SNMP adaptor, which is universal accepted by the main
software and hardware manufacturers.
The available SNMP optional for SLC TWIN series is card type,
in order to be inserted into the slot that UPS has in its rear side.
Thanks to this format, it is avoided to have small devices around
the UPS.
The connection from the UPS with the SNMP is internal, meanwhile
the one from the SNMP to the IT network is done through a RJ45
10-base connector.
3.4.2. AS400 card (C16).
The main target of the AS400 card is to transmit digital signals with
no potential for any use depending on the application. The most
common application of this kind of interface is the automatic closing
file and the computer shutdown later on, including the UPS.
The signals provided by the card in dry contact format are:
UPS fault (NO; normally open) •
General alarm (NC; normally closed) •
UPS on bypass (NC) •
Low battery alarm (NO) •
UPS on inverter (NO) •
Mains fault alarm (NO) •
Besides there is an input to shutdown the equipment remotely.
3.4.3. USB port card (C16).
The UPS SLC TWIN series has a USB port card as an option, which
converts the traditional RS-232 port with DB9 format into a USB
port (Universal Series Bus) type B.
This allows connecting the UPS with a personal computer (PC)
easily. The format of the USB optional is card type. It allows being
inserted into the slot that the UPS has available in its rear side.
3.4.4. Protocolo MODBUS.
The big IT systems based on LANs and WANs, many times require
that the communication with any element that is integrated inside
the IT network is carried out by means of an industrial standard
protocol.
One of the industrial standard protocols more used in the market is
the MODBUS protocol. The
SLC TWIN series is also ready to be
integrated in this type of environments through the external Win-
power CMC card , which is used for the interface to implement
the remote/monitor function without the computer direct commu-
nicate to the UPS. Without install the WinPower software, you are
not able to monitor/control the UPS through the LAN. Here is the
connection for the CMC card. Owing to the connection is in series,
once the cable is disconnected within the UPS connection, all the
UPS after that connection will all lose the communication
USER MANUAL