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4.5. MAIN QUALITY PERFORMANCES.
Wide range of powers for single and three phase installa-
•
tions.
Toroidal autotransformers (Variacs) for all the power range,
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fast and efficient with DC motors of 12 V or 24 V.
Output accuracy, better than 1 % (adjustable).
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Depending on the three phase equipments model common
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and independent regulation per phase, they are immune to
unbalanced loads.
As standard, input voltage range of ±15 %, being able to
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manufacture ranges up to ±30 %.
High efficiency, up to 97,5 %.
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High response time, up to 70 V/sec.
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Complete control panel with LCD to supervise the stabilizer.
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Output accuracy guaranteed by a control with MOSFET
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servo.
Immune to line voltage harmonics; True RMS stabilization.
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Stable operating against load and/or voltage fluctuations.
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Wide operating temperature ranges(–10 ºC.. +55 ºC).
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Dry contacts (2 as standard up to 11 as an option).
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Nil voltage harmonic re-injection.
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Optimized mechanical design, easy maintenance.
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Overload up to 200 % over the nominal for 20 sec..
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High robustness and reliability (high MTBF).
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Silent operating.
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Recyclable material in more than 80 %.
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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-
USER'S MANUAL
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.
As an option, if the application would need it, the range could be
extended from the standard ±15 % to a wide one (i.e. ±25 %),
by requesting an equipment with extended voltage range.
4.7. OPTIONS
4.7.1. Measurement of output currents, powers and
overload.
As standard the EMi3 stabilizer does not include the output cur-
rent measurements, although they can include the sensors as an
option. This option incorporates to the equipment one or three
current transformers at the output, depending if it is a single or
three phase equipment. Therefore, the LCD panel will display
some data derived from these current measurements like:
Depending on the equipment, single or three phase, one or
•
three output currents.
Depending on the equipment, single or three phase, one or
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three active output powers.
Depending on the equipment, single or three phase, one or
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three apparent output powers.
Depending on the equipment, single or three phase, one or
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three output load percentage.
Depending on the equipment, single or three phase, one or
•
three output power factors.
Thanks of having the current transformers, some alarms would
be activated too: over current or overload in case of exceeding
the nominal currents or powers of the stabilizer.
4.7.2. Maximum-minimum output voltage protection.
The Maximum-minimum protection is an option that includes a con-
tactor to break the input or output voltage of the equipment in case
the voltage is out of the preset range. By default, it is set to ±7 %.
This option can be set with different operating ways:
Maximum-minimum input or output voltage (by default at
1.
the output).
Protection of only Maximum, only Minimum or Maximum-
2.
Minimum voltages (by default Maximum-Minimum).
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EMi3 SERVOMOTOR VOLTAGE STABILISER
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