Salicru SLC CUBE 4 7.5 kVA Mode D'emploi page 88

As already explained in the Rectifier-booster section, in battery
mode, the battery voltage will be connected (via controlled thyris-
tors) to the booster input, and this converter will be disconnected
from the AC input (except for hybrid operating modes).
In terms of charging the batteries, this will occur when the UPS is
working in normal mode (AC voltage network present, AC/DC rec-
tifier operating). The UPS has a reducer converter ("buck"), which
is supplied by the DC bus voltage, adjusting it to the required levels
for charging the batteries. This battery charging includes 2 basic
stages, or even 3 (depending on the type of battery):
Constant current: the set charge current must not be exceeded,
•
and the output voltage of the charger will be dynamically ad-
justed to achieve this allocation.
Constant voltage: once the battery floating voltage is reached,
•
the charge current will decrease. This floating voltage must be
maintained in normal mode, a voltage that will be readjusted
depending on the temperature.
Quick charge or "boost"
•
tery (chemistry), an intermediate stage can be configured, after
charging at constant current and before allocating continuous
float voltage, which consists of supplying the batteries with
a voltage that is higher than the floating voltage for a limited
time, in order to obtain a quicker and more efficient recharge.
The architecture of the charger is based on a double reducer
converter: from positive and negative semi-buses, positive and
negative battery charge voltages and currents are obtained. The
switching of the charger's IGBTs also consists of a PWM controlled
digitally by DSP.
The charger incorporated as standard in the units allows the bat-
teries to be recharged for both standard autonomy and for ex-
tended autonomy (greater capacity in Ah installed).
4.4.5. Static bypass.
The static bypass switch allows the load or loads to be switched
between the inverter and the emergency (or bypass) network, and
vice versa, without interruption. This bypass line may or may not be
common to the rectifier AC input.
However, and unless otherwise requested - separate networks -,
the phase terminals of both blocks are connected internally at the
factory in order to have a single common input.
When separate power supplies are required, it will be necessary
to remove the bridges between phases from both blocks before
connecting the power cables.
The switching of the output load to the bypass line can be or-
dered manually, or it can be activated by the UPS automatic
control in certain emergency situations, such as overload or
overtemperature.
As power switching elements, it uses thyristors (SCR) and relays.
Thyristors for connecting/disconnecting the voltage of the bypass
line to the loads, relays for connecting/disconnecting the inverter
voltage.
88
voltage: depending on the type of bat-
4.4.6. Manual or maintenance bypass.
The manual bypass is used to isolate the UPS from the input
voltage and loads, supplying the load directly from the input net-
work in the event of maintenance or serious faults.
It consists of a switch, supplied as standard and integrated in the
unit, which allows the bypass or emergency line voltage (common
or not to the rectifier AC input) to be connected directly to the
output by simply activating this switch, and without the interven-
tion of a converter or controlled electronic device. An auxiliary
signal will notify the UPS control that this switch is activated.
The manual bypass switch supplied in the unit has a mechanical
lock that makes it impossible for it to be activated accidentally by
unqualified staff.
Before operating this switch, it is necessary to transfer the power
supply of the load on the static bypass via the respective command
from the touchscreen. The transfer of the power supply to the loads
from the static bypass to the manual bypass is without interruption.
External manual bypass.
In addition to the standard internal manual bypass, it is also pos-
sible to optionally install an external manual bypass.
4.4.7. Input-output configurations.
The types available are:
Three-phase/three-phase (with or without separate bypass).
•
Three-phase/single-phase.
•
Single-phase/single-phase (with or without separate bypass).
•
The user is not permitted or authorised to change the con-
figuration, as this implies the modification of the plates
between the power terminals by adding or removing them in order
to obtain the required configuration, as well as changes to varia-
bles from menus accessed by "Password" via the control panel.
4.5. OPERATING MODES.
The UPS can operate in various operating modes, which can be
reached automatically or forced by a manual action of the operator.
These basic operating modes are:
Normal mode.
•
Battery mode (autonomy mode).
•
Bypass mode.
•
Maintenance bypass mode.
•
ECO mode.
•
Frequency converter mode.
•
Standby mode.
•
4.5.1. Normal mode.
For the UPS to work in normal mode, there must be an input net-
work (input switch activated), output switch activated (supply for
the loads), and there must be batteries in the unit or connected in
an external cabinet.
SALICRU