17
accordance with the Regulations or standards of the
country, in order to avoid dropping voltages.
In the own documentation and for each configuration,
it is available the information for «N» equipments in
parallel, as well as the features of the «Backfeed pro-
tection».
•
In parallel systems, the length and cross cable sec-
tion that connect the switchgear or manual bypass
panel with each UPS must be the same for all of them, with
no exception.
•
The cross cable section must be always according to the size
of the own terminals of the switches, in such way that the
wire is embraced properly, in order to guarantee an optimal
contact between both parts.
•
The data in the nameplate of the equipment states the
nominal current only, as the safety standard EN-IEC
62040-1 states. To calculate the input current, it has been
considered the power factor and the own efficiency of the
equipment.
The overload conditions are considered as a non-perma-
nent and exceptional operating mode, so it will not be kept
in mind when sizing the protections. Do not connect devices
to the UPS terminals or outlets that could overload it, like
motors.
•
TWIN/3 PRO2 models (three phase input and single
phase output), the input current of R phase and Neutral
is higher than the other two lines/phases when the UPS
works on bypass mode (loads supplied from mains directly). Pay
attention to the nameplate data to size the two corresponding
cables.
•
In case of adding peripheral parts at the UPS or parallel
system input or output, like transformers or autotrans-
formers, the stated currents in their own nameplates
must be also considered, in order to use the suitable cross
cable section, by respecting the Local and/or National Low
Voltage Electrotechnical Regulation.
•
When a UPS or parallel system, as standard, as an option
or installed by yourself, at the input line or at the output or
in both, include a galvanic isolation transformer, a Residual
Current Device must be installed at its output, in order to
protect against electrical shocks and indirect contacts, be-
cause its intrinsic feature of isolation will prevent the trip-
ping of the protections fitted in the primary winding of the
transformer.
•
As a reminder, all the isolation transformers installed or
supplied from factory has the output neutral connected to
the protective earth by means of a cable bridge between
the neutral and PE terminals. In case of requiring an iso-
lated output neutral, remove this cable bridge, by taking
the stated cautions in the local and/or national low voltage
regulations.
•
This equipment is ready to be installed in grids with
power distribution systems TT, TN-S, TN-C or IT,
keeping in mind the particular features of each neutral re-
gime and the electrical regulations of the destination
country.
•
The switches, RCD and circuit breaker of a three phase input
equipment connected to an IT power distribution system
must break the NEUTRAL apart from the three phases.
•
TWIN PRO2 has a terminal strip to install an external emer-
gency power off button -EPO-. Only one device has to be
fitted in, in order to break the energy to the loads in any
operating mode.
5.1.5.5. Preliminary considerations for batteries and their
protections before connecting the equipment.
•
All the standard UPSs include batteries in the same enclo-
sure, less those models called B0 and B1. For the standard
UPSs, the battery protection is done by internal fuses and
they are not accessible by the end-user.
Also, the battery modules have protection and in this case they
are doubled. Once are internal by means of fuses and not ac-
cessible by the end-user and the second ones by means of a
two poles circuit breaker or fuses.
•
IMPORTANT FOR THE SAFETY: In case of installing the
batteries by yourself, the battery set must have a two
poles circuit breaker or fuses switch, with the size stated in
Tab. 2.
•
Inside the battery module there are DANGEROUS VOLT-
AGES with the risk of electrical shock it involves, so it is
classified as RESTRICTED ACCESS AREA.
•
Do not handle the battery fuse holder or circuit breaker
switch when the equipment is turned ON. These
switches
cannot be turned ON/OFF with load
.
•
When the power supply to the equipment or parallel
system is broken and it is foreseen an out of service of
the equipment for long time, the equipment must be shutdown
completely.
•
The battery circuit is not isolated from the input
voltage. So, dangerous voltages can be found be-
tween the battery terminals and the earth. Check that there
is not any kind of voltage, before doing any action over the
terminals.
5.1.5.6. Connection parts.
•
Any electrical connection of the equipment is done through
the rear side of the equipment:
Input and output connection terminals. Remove the
fixing screws of the protection cover and the own cover,
to have access to the terminals.
Connect the UPS with the battery modules. Depending
on the power rate of the UPS, it has a connector or ter-
minals.
–
Equipment and battery module with connector. Re-
move the screws and the «BATTERY CONNECTOR»
cover. These covers will not be put back again,
keep them.
–
Equipment with battery terminals. They are beside
the AC power terminals.
–
Battery module with terminals. Remove the screws
and protection cover.
Communication connectors:
–
DB9 type for RS232.
–
USB type for communication as a peripheral.
–
Digital input and output.
–
Terminal strip for external EPO button.
–
Auxiliary contact for manual bypass switch.
Control connections for parallel systems, by DB15 connec-
tors and analogical signal for current sharing. Remove the
screws and the protection cover to have access to them.
SLC TWIN PRO2
UNINTERRUPTIBLE POWER SUPPLY (UPS)
USER'S MANUAL
