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3.4. OPTIONAL.
Depending on the chosen configuration, your equipment could in-
clude any of the following optional:
3.4.1. Isolation transformer.
The isolation transformer, provides a galvanic insulation that allows
isolating the output from the input completely.
The installation of a shield screen between the primary and sec-
ondary windings in the transformer provides a high attenuation of
electrical noises.
The isolation transformer can be installed at the input or output of
the UPS TWIN series and it will always be placed externally from
the equipment’s enclosure.
3.4.2. External maintenance bypass.
The purpose of this optional is to electrically isolate the equipment
from mains and critical loads without breaking the power supply
to the last ones. This way the maintenance or fixing tasks can be
done in the equipment without breaking the power supply to the
protected system, at the same time that we are avoiding unneces-
sary risks to the technical staff.
The basic difference between this optional and the manual bypass
already built in the UPS enclosure consists in a better operating, be-
cause it allows the total UPS disconnection from the installation.
3.4.3. Integration into IT networks through the SNMP
adaptor.
The big IT systems based on LANs and WANs that are made 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 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 of 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.
3.4.4. AS-400 card.
See section 4.7.2.
3.4.5. USB port card.
The UPS TWIN series has a USB port card as an option, which con-
verts the traditional RS-232 port with DB9 format to 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.
3.4.6. Parallel cable.
The parallel cable is used to do the parallel control communication
among the equipments that make up a system.
All the models from TWIN series already have the parallel kit (ex-
cept models in rack 19’’) as an intrinsic feature of the series. In
case you need to upgrade the power of the equipment or to have
redundancy by paralleling equipments with the same power rate,
this cable is needed.
3.4.7. MODBUS protocol.
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 TWIN series is also ready to be inte-
grated in this type of environments through the external “WinPower
CMC” card adaptor with MODBUS protocol.