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Variacs › Statics
- Voltage input : single-phase 230 Vac or three-phase 400 Vac + N
- Output : single-phase from 0 to 250 Vac or
three-phase 432 Vac + N
- Frequency 50/60 Hz
- Mains galvanized isolation
- Resolution 0,98 V single-phase, 1,7 V three-phase
- Voltage regulation on any power rating
- Stabilizing precision on max. rating ±1%
- Ambient temperature -10 + 40°C
- Wave distortion < 0,01 %.
- Unaffected by power load factor
- Resistant to surge overloads 5 In. approx.
- Efficiency from 91 to 98 %
Static power control
To vary AC power from zero up to a preset value
statically, without introducing wave distortions and
maintaining a stable value, is now possible with Digivar
VDR/2000.XXX and VDR/3000.XXX Families,
single and three-phase, now represent the most innovated Variacs on the market.
Using the same base principle of Digistab stabilizers, we
have now designed a Variac with a resolution of 8 bit,
which can start from zero volt and reach the output power
or a higher value.
What are the advantages of a Static electronic Variac vs.
the traditional toroidal or column type with brush
The most obvious advantage is the absence of moving
mechanical parts, which can wear down with time. The
second and not less important point is the absence
of withdrawal parts: the traditional brushes
which assured an electric contact have now been
substituted with graphite brushes, which have a high
electric resistance and short circuit, thus avoiding high current circulation.
This resistance, which is very important for perfect
functioning of the electromechanical Variac, could cause a
power fall from empty to load and a power loss, which
would cause over heating that would ruin the brushes.
This does not exist in these Variacs as the power is
obtained by a micro step type static system.
These Variacs feature a mains galvanised isolation, which
isolates the system and made secure for those who have to
use it; the secondary has a very low voltage. One
can use 6 bit, which would permit a continual resolution 0,23 V
How do VARAT's Variacs work ? They are mainly made
up form a series of generators with a 50% decreased
nominal power up to 256th, all connected in series.
The lowest power step is of 1 volt and this is also the step
with which the power will be converted from zero to the
When the Variac reaches the requested power value, with a
keyboard or other optional signals, it stabilizes and
maintains the power, depending on the load.
The Variac's precision is determined by the smallest step,
in this case 1 V, whatever the output voltage is. If
it is working at 230 V, we will have 0,4%, and at 110 V, 0,9%.
The precision, silence and reliability are only some of
the high points, along with the possibility in controlling
the device with digital systems, like PLC or PC. It
can also be used with the keyboard supplied.
The Variacs belong to the new generation of machines and
are the perfect answer against pollution.
Catalogue download in PDF:
- Digivar catalogue