Salicru SLC ADAPT2 Series User Manual page 18

4.3.2.1.1. Power modules (PM).
Power modules are the basic core of all SLC ADAPT2 systems.
Apart from the static bypass block and LCD touch screen, each
power module contains all of the converters and functionalities
of a traditional UPS. Since this equipment is designed to use a
variable number of modules, depending on the cabinet used,
a multi-parallel system is obtained with behaviour equivalent
to that of a single mono-bloc UPS plus the advantages of a
modular UPS. The system supplies power to the critical loads
(such as communication and data processing equipment) with
uninterrupted high quality AC power. The power supplied by
the unit is stable, without voltage and/or frequency variations
and free from other disturbances such as cuts or micro-cuts,
sine wave alterations or electrical noise, anomalies commonly
present in the commercial AC network.
This is achieved through the double-conversion and high fre-
quency Pulse Width Modulation (PWM), in combination with a
digital control based on a Digital Signal Processor (DSP), which
provides high reliability and availability.
As can be seen in , the AC power supplied to the UPS input is
converted into DC voltage. This voltage supplies a converter
that transforms the voltage type from DC to AC, clean of dis-
turbances and variations of the AC input mains. If this fails, the
PFC rectifier changes the input source of the AC mains to that
of the batteries, powering in the same way through the output
of the UPS to the load for a limited time, that of the backup
determined by the battery pack.
4.3.2.1.2. Static bypass.
Static transfer switch.
In the event of inverter failure, overload or over-temperature,
the voltage connected to the static bypass line can supply
power to the load connected to the UPS output.
The static bypass module identified in
management and control circuits that allow the most optimum
decision in each scenario to be made, in order to select the
most favourable power to the critical load connected to the
output of the UPS, either from the inverter or from the static
bypass itself.
During normal system operation, the load is connected to the
inverter and in case of overload or failure, it will automatically
transfer to the static bypass line. In order to provide a clean
transfer (without interruption) between the inverter output and
the bypass line, they must be fully synchronised during normal
operation. This is achieved through real-time digital control of
the inverter, so that the frequency of the inverter follows the
frequency of the bypass line if the bypass is within the range of
acceptable frequencies.
In addition, a Manual Bypass, which is very useful during pe-
riods of maintenance or failure, can be included (internal or ex-
ternal), allowing continuous powering of the critical load while
the UPS is out of service.
When the UPS is operating in bypass mode (over
static bypass), connected devices are not protected
against power cuts or micro-cuts, overvoltages, voltage
and/or frequency variations as they are powered directly
from the AC mains.
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4.3.2.1.3. Battery charger modules.
The range of UPSs for 10 and 15 kVA modules has 15 A chargers
in the same format as the conventional modules. These charger
modules can be inserted in any slot in a UPS without having to
turn it off.
As many chargers as there are slots available in the UPS can
be installed.
4.3.2.1.4. Manual bypass switch for maintenance (optional).
The device has an optional manual bypass switch with a me-
chanical lock, , useful for periods of preventive maintenance or
repair. This switch transfers the load power directly onto the AC
input mains, allowing the intervention on the UPS without this
preventing further feeding of the loads.
The cabinet has a front door that prevents access to unauthor-
ised personnel, especially when safety measures so require
(protection against direct contact). As an alternative, these
mechanisms can be installed in a wall-mounted "manual by-
pass board", which for safety has a door with access restricted
to authorised personnel.
contains the power
4.3.2.2. Parallel system.
4.3.2.2.1. Parallel system considerations.
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When the UPS is operating in manual bypass mode
(maintenance or repair period), the connected de-
vices are not protected against power cuts or micro-cuts,
over- voltage, or voltage and/or frequency variations, as
they are powered directly from the commercial AC mains.
Before operating this switch it is necessary to transfer
the load power over the static bypass through the respec-
tive command from the touch screen. The switching of
the power mode onto the static bypass and from that to
the manual bypass is done without any interruption in the
supply to the loads.
When installing protection devices, their ratings
must be appropriate to the currents indicated on the
nameplate and to the specifications indicated in Chapter
of this document.
All UPS modules have hardware and software that is suitable
for and compatible with the requirements of parallel systems.
Although all modules installed in a cabinet are internally
connected in parallel, parallel connection between UPSs
is also possible because a communications board is sup-
plied as standard equipment for this function. The resulting
power range, according to the input/output type, and the
individual power of each module, is shown in .
The hardware adjustments referring to the change of input
and output configuration are reserved exclusively to the
manufacturing process itself or subsequent in-situ configu-
ration performed by the T.S.S.
The UPSs are supplied with terminal strips for connecting
the power cables and a number of connectors for the con-
trol bus and interface signals.
Using the DB15 signal connectors, the parallel control bus
is connected in the form of a closed ring, linking the dif-
ferent UPSs that configure the system in parallel.
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