Salicru SLC TWIN series User Manual

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Salicru SLC TWIN series User Manual Manual pdf 15 page image

143.3. 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 higherreliability and protection to the output electrical power supply insmall 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 thePower Factor Corrector (hereafter PFC).The PFC boosts the DC voltage to optimal levels so the inverterconverts that DC voltage into an AC sinewave voltage, which isstabilized in voltage and frequency, and ready to feed the loads.The batteries are connected to the PFC input through a thyristor ofmedium power, for those cases that their energy is needed (mainsfault or energy with poor quality).The battery charger takes the energy from the PFC output (forequipments with standard autonomy), and adapts it to the optimallevels of the battery bank to charge.This double conversion structure is complemented with a bypassswitch. 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 linedirectly in those special conditions like overloads, overtempera-tures, etc. And they are connected to the inverter again when thenormal 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 SNMPadaptor (C16).The big IT systems based on LANs and WANs that make up serverswith different operating systems has to include the control andmanagement help at the managing system disposal. This help is gotthrough the SNMP adaptor, which is universal accepted by the mainsoftware 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 aroundthe UPS.The connection from the UPS with the SNMP is internal, meanwhilethe one from the SNMP to the IT network is done through a RJ4510-base connector.3.4.2. AS400 card (C16).The main target of the AS400 card is to transmit digital signals withno potential for any use depending on the application. The mostcommon application of this kind of interface is the automatic closingfile 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, whichconverts the traditional RS-232 port with DB9 format into a USBport (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 beinginserted 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 requirethat the communication with any element that is integrated insidethe IT network is carried out by means of an industrial standardprotocol.One of the industrial standard protocols more used in the market isthe MODBUS protocol. The SLC TWIN series is also ready to beintegrated in this type of environments through the external Win-power CMC card, which is used for the interface to implementthe remote/monitor function without the computer direct commu-nicate to the UPS. Without install the WinPower software, you arenot able to monitor/control the UPS through the LAN. Here is theconnection for the CMC card. Owing to the connection is in series,once the cable is disconnected within the UPS connection, all theUPS after that connection will all lose the communicationUSER MANUAL