Salicru EMi3 User Manual - page 22
22
SALICRU
The LCD panel shows the values of the input/output voltages
and frequency. The measurement of output current, active and
apparent powers, power factor are available with the output
current transformers option. Also, the LED indicators inform
about the status of the equipment. To know in detail the LCD
panel information and the meaning of the LEDs go to the cor-
responding section of this manual (section 7). The input fuses
or circuit breaker protections, provides protection against long
over currents to both the loads and the stabilizer. Depending on
the model and the protection degree IP, the cooling is natural or
forced, in order to keep the internal temperature stable.
Although the input voltage range is ±15 % for the standard
models, under request, it is possible to manufacture equip-
ments with wide input voltage range up to ±30 % (input voltage
window).
The voltage stabilizer protects against sudden changes, irregu-
larities, increasing or decreasing of the voltage mains by means
of an accurate voltage stabilization.
Also, as standard the control electronic unit includes the Max-
imum and minimum voltage protection signal (adjustable to
input or output, but by default on the last), which is needed
to disconnect the output by means of a contactor, which can
be fitted in as an option at the factory, in case of the voltage
exceeds the allowed limits or mains fault. In order to keep the
protection against sudden voltage changes, the signal is de-
layed a few seconds.
It is also possible to include an option that allows discon-
necting the output of the stabilizer due to overload. In this case,
the equipment will include the output current sensors to make
the overload measurement.
As an option, the stabilizer can be equipped with a manual
Bypass, which is not ready to be manoeuvred with load con-
nected. It allows keeping the loads supplied during the mainte-
nances or fixing periods.
Regarding the communications, to highlight that the equipment
is supplied with a RS232 serial communication port and a Slot
to insert the SICRES Ethernet card. Under request the communi-
cations of the stabilizer can be upgraded by 2 programming dry
contacts connected to terminal strip or even by implementing
the communication module, which includes two serial commu-
nication channels and 9 additional dry contacts.
4.5. MAIN QUALITY PERFORMANCES.
•
Wide range of powers for single and three phase installa-
tions.
•
Toroidal autotransformers (Variacs) for all the power range,
fast and efficient with DC motors of 12 V or 24 V.
•
Output accuracy, better than 1 % (adjustable).
•
Depending on the three phase equipments model common
and independent regulation per phase, they are immune to
unbalanced loads.
•
As standard, input voltage range of ±15 %, being able to
manufacture ranges up to ±30 %.
•
High efficiency, up to 97,5 %.
•
High response time, up to 70 V/sec.
•
Complete control panel with LCD to supervise the stabilizer.
•
Output accuracy guaranteed by a control with MOSFET
servo.
•
Immune to line voltage harmonics; True RMS stabilization.
•
Stable operating against load and/or voltage fluctuations.
•
Wide operating temperature ranges(–10 ºC.. +55 ºC).
•
Dry contacts (2 as standard up to 11 as an option).
•
Nil voltage harmonic re-injection.
•
Optimized mechanical design, easy maintenance.
•
Overload up to 200 % over the nominal for 20 sec..
•
High robustness and reliability (high MTBF).
•
Silent operating.
•
Recyclable material in more than 80 %.
4.6. OPERATING PRINCIPLE
The electronic control manages the output voltage of the stabi-
lizer permanently, providing a correction signal the DC motor, in
order to achieve the wanted output voltage with an accuracy of
±1 % (adjustable from ±0,5 % up to ± 5 %). The motor acts
over the toroidal autotransformer, by increasing or decreasing
the voltage, by moving the brush in the variable tap in one way
or to the other.
The resultant voltage is applied to the primary winding of the
«Booster», which adds in phase or counter phase the voltage to
the mains through its secondary winding, by stabilizing in this
way any fluctuation over the nominal voltage that could occurs.
If the input voltage is higher than the voltage range of the
equipment, the output regulation will reach its maximum or
minimum correction and from this point the voltage difference
will be added or subtracted to the output directly, unless the
equipment has the Maximum-minimum output voltage protec-
tion (see section 4.7.2), which will avoid supplying the loads out
of the output voltage range, so it will break the power supply to
the loads when the ranges is exceeded.
I.e., an equipment with 3x400 V ±15 % (3x340.. 460 V) and
without Maximum-minimum protections, when the input
voltage is 3x330 V the output voltage supplied to the loads will
be 3x390 V. The difference between the low voltage regulation
(3x340 V) and the applied voltage at the input terminals (3x330
V) is 10 V. This voltage difference, that the stabilizer cannot cor-
rect will be subtracted from the nominal output voltage (3x400
V), because the output voltage cannot be stabilized beyond of
the design range, so the loads will be supplied at 3x390 V.