Salicru SLC CUBE 3+ Mode D'emploi page 102

high immunity to the noise and long range (approx. 800m).
The used protocol is "MASTER/SLAVE" type. The computer or
IT system ("MASTER") asks for a determined data, and the UPS
answers immediately ("SLAVE").
4.4. OPERATING PRINCIPLE OF AN EQUIPMENT.
UPS from SLC CUBE3+ series is a double conversion system AC/
DC, DC/AC with sinewave output that supplies a safe protection
in extreme conditions of electrical power supply (fluctuations of
voltage, frequency, electrical noises, blackouts and mains faults,
etc...). Whatever the type of load to protect is, these equipments
are ready to assure the quality and uninterruptible electrical power
supply.
The use of the transformerless technology allows a significant re-
duction of weight and volume in the equipments, by improving a lot
important coefficients like the power/footprint ratio.
• Basically its operating is the following:
ˆ The rectifier, an IGBT three phase rectifier, converts the AC
voltage in DC by draining a sinewave current (THDi <2%),
charging the batteries with constant current/voltage.
ˆ Batteries, Pb-Ca by default, supply the required energy by
the inverter in case of mains fault. The equipment can sup-
port AGM, Gel or Ni-Cd batteries. For the last two type of
batteries, the equipment includes a double level charger.
ˆ The inverter is in charge of converting the DC bus voltage
into AC providing an alternating sinewave output, stabilised
in voltage and frequency, ready to supply the loads con-
nected at the output.
ˆ The basic structure of double conversion is complemented
with two new functional stages, static bypass switch and
manual bypass switch.
ˆ The static bypass switch connects the output load with by-
pass line directly in special conditions like overload or over
temperature and it is reconnected to inverter again, once
the normal conditions are restored.
ˆ SLC CUBE3+ B version has two separate lines for the
rectifier and bypass stages increasing in the safety of the
installation, because it allows the use of a second line (gen-
erator set, other company, etc...).
ˆ The manual bypass switch isolates the UPS from mains and
loads connected at the output, so the maintenance tasks
can be done inside the UPS without interrupting the supply
to the loads.

4.4.1. Normal operating (
With mains present, the rectifier converts the AC input voltage into
DC, by boosting the DC voltage to an optimal level to feed the in-
verter and battery charger.
The inverter is in charge of converting the DC bus voltage into AC
providing an alternating sinewave output, it stabilises the voltage
and frequency, ready to supply the loads connected at the output
(Fig. 25 and 26).
102
).
4.4.2. Mains fault operating (
In case of mains fault or blackout, the battery set supplies the
needed energy to feed the inverter.
The inverter still operates normally, without noticing the lack of
mains and the back up time depends in the capacity of the battery
set only (Fig. 25 and 26).
When the battery voltage reaches the low voltage, the control
blocks the output in order to protect the batteries from being deep
discharged. When mains is restored and after the first seconds of
analysis, the UPS goes back to operate as it is described in the
previous section «4.4.1. Normal operating».
When mains is restored after a blackout, it is activated the rectifier
soft start according to the «Walk-in Time» setting (10 sec. by default),
which later one can be set between 0 and 99 sec. by our T.S.S.,
considering that figure 0 is disabled.
Also another parameter that manages the rectifier is the start up
delay «Walk-in Delay» (5 sec. by default and setable between 0
sec. and 1 h). This functionality is very useful in installations where
the UPs is supplied by a generator set and it is required to wait to
tart up till having a stabilized voltage and frequency.
Schematically, the operating is as follows:
AC mains Walk-in
 
is restored Delay
4.4.3. Operating with non-active inverter (
The inverter is non-active due to alarm conditions like overloads,
over temperatures, etc... In this case the rectifier is still charging the
batteries in order to keep their optimal charge status.
The inverter is also non-active if the start up has not been done
through the keypad of the control.
In both cases, the output voltage of the UPS comes from the emer-
gency bypass line through the static bypass switch (Fig. 25 and 26),
on condition that the EPO is inactive.
4.4.4. Manual bypass operating (
When it is required to make any maintenance service to the equip-
ment, it can be disconnected from mains without breaking the
power supply of the system and affecting it to the critical load. The
UPS can only be intervened by technical or maintenance staff, by
means of the manual bypass switch (respect the corresponding op-
erative instructions later on stated).
4.4.5. Smart ECO Mode operating (
For those applications with lower requirements, the smart and ef-
ficient function «Smart ECO Mode», meanwhile the power supply
is available, allows the equipment feeding the loads directly from
mains through the solid state static bypass («Off Line» mode).
In case of mains fault, the system will automatically shift to normal
operating mode («On Line») and will supply the loads through the in-
verter with the energy of the batteries. The «Smart ECO Mode» op-
erating mode improve the efficiencies between 4 and 4,5 % highest
than «On Line» normal mode, so it is close to 100 %.

).
Rectifier soft start in ramp, for the
preset Walk-in Time

).

).
 
/ ).
USER MANUAL