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SALICRU
4.3. OPERATING PRINCIPLE.
This manual describes the commissioning and operating of the Un-
interruptible Power Supplies -UPS- from SLC TWIN PRO2 series
as equipments that can operate in parallel or single configura-
tions, without needing a centralised bypass. The UPS's from SLC
TWIN PRO2 series assure an optimal protection for any critical
load, keeping the power supply to the loads inside the stated pa-
rameters, with either no break in case of mains failure nor fluc-
tuations. The wide range of available models (from 4kVA up to
20kVA), allows adapting the model to the end-user needs.
Thanks to the used technology, PWM (Pulse Width Modulation)
and the double conversion, the UPS's from SLC TWIN PRO2 series
are compact, cold, silent and with high efficiency.
The double conversion principle cancels any fluctuations from the
electrical mains. A rectifier converts the alternating current from
mains in to direct current, and it keeps the optimal charge level to the
batteries and at the same time feeds the inverter; the inverter gener-
ates a alternating current sinewave, which is ready to feed the loads
constantly. In case of power outage at the UPS input, the batteries
supply the energy to the inverter.
The UPS design and manufacturing from SLC TWIN PRO2 series
has been done in accordance with the international standards.
These equipments allow their upgrading by connecting addi-
tional equipments of the same power rate in parallel, in order
to get redundancy -i.e.: N+1- or increasing the power of the
system.
Therefore, this series has been designed to maximize the avail-
ability of the critical loads in order to protect them against
voltage fluctuations, power outages and blackouts, which are
present in the energy distribution lines. This is the main aim of
the UPS's from de SLC TWIN PRO2 series.
This manual applies to the standardised models stated in Tab.
1.
4.3.1. Main features.
•
True on-line technology of double conversion and inde-
pendent output frequency from mains.
•
Output power factor 1 in single phase input equipments and
0.9 in three phase input ones. Pure sinewave shape, suit-
able for almost all type of loads.
•
Input power factor > 0.99 and high efficiency (> 0.94 for
single phase input or > 0.92 for three phase input). So, it
is got a high economy saving and lower installation cost
-wiring-, as well as low input current distortion, so the per-
turbances to mains are reduced.
•
Great adaptability to the worst conditions of input mains.
Wide input voltage range, frequency range and wave
shape, so it is avoided the excessive use of the battery,
which has limited energy.
•
Available battery charger up to 8 A in order to decrease the
battery recharge time.
•
Parallel redundant N+X connection, in order to increase
the reliability and flexibility. 3 equipments in parallel as
maximum.
•
Selectable of the High Efficiency Mode > 0.97 -ECO-MODE-.
Energy saving, which means economic saving for the end-
user.
•
Possibility to start it up with no mains or discharged bat-
teries. Be careful, with this last point, because the back up
time will be reduced, as much as they are more discharged.
•
The smart battery management technology is very useful
to extend the lifetime of the batteries and to optimise their
recharging time.
•
RS232 or USB communication ports as standard.
•
Digital input to start up-shutdown the equipment.
•
Digital output for «General alarm» warning.
•
Remote emergency power off -EPO-.
•
User-friendly interface between user and equipment by
means of the control panel with LCD and LED.
•
Optional available cards to improve the communication ca-
pabilities.
Model
Type
Input/output topology
SLC-4000-TWIN PRO2
Standard
Single phase in/out
SLC-5000-TWIN PRO2
SLC-6000-TWIN PRO2
SLC-8000-TWIN PRO2
SLC-10000-TWIN PRO2
SLC-8000-TWIN/3 PRO2
Three phase in / Single
phase out
SLC-10000-TWIN/3 PRO2
SLC-15000-TWIN/3 PRO2
SLC-20000-TWIN/3 PRO2
SLC-4000-TWIN PRO2 (B0)
No batteries
Single phase in/out
SLC-5000-TWIN PRO2 (B0)
SLC-6000-TWIN PRO2 (B0)
SLC-8000-TWIN PRO2 (B0)
SLC-10000-TWIN PRO2 (B0)
SLC-8000-TWIN/3 PRO2 (B0)
Three phase in / Single
phase out
SLC-10000-TWIN/3 PRO2 (B0)
SLC-15000-TWIN/3 PRO2 (B0)
SLC-20000-TWIN/3 PRO2 (B0)
SLC-4000-TWIN PRO2 (B1)
Extended back up time
Single phase in / out
SLC-5000-TWIN PRO2 (B1)
SLC-6000-TWIN PRO2 (B1)
SLC-8000-TWIN PRO2 (B1)
SLC-10000-TWIN PRO2 (B1)
SLC-8000-TWIN/3 PRO2 (B1)
Three phase in / Single
phase out
SLC-10000-TWIN/3 PRO2 (B1)
SLC-15000-TWIN/3 PRO2 (B1)
SLC-20000-TWIN/3 PRO2 (B1)
Tab. 1.
Standardized models.
4.4. OPTIONS.
Depending on the selected configuration, the equipment can
include any of the following options:
4.4.1. Isolation transformer.
The isolation transformer, provides a galvanic isolation that al-
lows isolating the output from input completely and/or even
change the neutral regime.
The fact of having an electrostatic shield between the primary
and secondary windings of the transformer provides a high at-
tenuation level of the electrical noise.
Physically, the isolation transformer can be located at the input
or output of the UPS, depending on the particular specifications
