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Les langues disponibles
Les langues disponibles
LCD.-
Liquid crystal display, a device invented by Jack Janning,
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who was an employee of NCR. It is an electrical system for
data presentation formed by 2 transparent conductive layers
and a special crystalline material in the middle (liquid crystal)
which have the ability to orientate light as it passes through.
LED.-
Light-emitting diode, a semiconductor device (diode)
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that emits light that is almost monochromatic, that is to
say, it has a very narrow spectrum when it is polarised
directly and is penetrated by an electric current. The colour
(wavelength) depends on the semiconductor material used in
the construction of the diode, and can vary from ultraviolet,
passing through the visible light spectrum, to infrared, the
latter called IRED (infra-red emitting diode).
Load.-
Any electrical device connected to the UPS is a 'load'.
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The load is the amount of current/power required by the
connected electronic unit(s).
Maintenance bypass.-
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the mains supply without protection, while the UPS is isolated
and safe for service or repair.
Normal mode.-
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the mains supplies the UPS that protects the applications.
Online mode.-
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connected to a system, is operative, and normally has its
power supply connected.
Power factor corrector (PFC).-
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between the usable power in watts and the total power
supplied in VA (volt amperes). The closer the power factor is to
unity (1), the more energy efficient the UPS operation will be.
Power factor.-
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as the ratio between active power, P, and apparent power, S,
or as the cosine of the angle formed by the current and voltage
factors, designated in this case as cos ϕ, where ϕ is the value
of the angle.
Programmable sockets.-
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disconnected during the battery autonomy time.
Rectifier.-
In electronics, a rectifier is the element or circuit
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that converts AC into DC. This is done by using rectifier diodes,
whether solid state semiconductors, vacuum valves or gaseous
valves, such as those containing mercury vapour. Depending
on the characteristics of the AC power that they use, they are
classified as single-phase when they are powered by a mains
phase or three-phase when they are powered by three phases.
Depending on the type of rectification, they can be half wave
when only one of the half cycles of the current is used or full
wave when both half cycles are used.
Relay.-
A relay is an electromechanical device that functions
•
as a switch controlled by an electrical circuit in which,
by means of an electromagnet, a set of one or several contacts
is activated to enable other independent electrical circuits to
be opened or closed.
RS-232.-
serial communications protocol. It can be used
•
between a UPS and a computer to communicate alarm, status
or control signals and instructions.
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It is a switch to change the load to
Normal operating mode of the UPS in which
A device is said to be online when it is
It is the ratio that is defined
The power factor, PF, of an AC circuit is defined
Sockets that can be automatically
SCR.-
Silicon controlled rectifier, commonly known as
•
a thyristor, a 4-layer semiconductor device that works as an
almost ideal switch.
SNMP.-
It is a standard communications protocol. It means
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"Simple Network Management Protocol" and is used in
computer network management systems to monitor the UPS
connected to it from a remote PC.
Start-up with battery (Cold Start).-
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connected to the UPS to be powered up in the absence
of electric power supply. The UPS then works only with
the battery.
THD.-
Total harmonic distortion. Harmonic distortion occurs
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when the output signal of a system does not equal the signal
that entered it. This lack of linearity affects the waveform
because the device has introduced harmonics that were not
in the input signal. Since they are harmonic, that is to say,
multiples of the input signal, this distortion is not so dissonant
and is less easy to detect.
UPS.-
Uninterruptible power supply.
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It allows units
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