150
SVGm
Instruction Manual
ENGLISH
4.7.- LOW MAINS VOLTAGE
Note: Operating mode available with software versions DSP ≥ 1.61 and HDMI ≥ 1.2006.
When the device detects an instantaneous voltage change of more than 15% with respect to the initial
voltage, the SVGm automatically stops to check the stability of the mains and recalculate the operating
parameters.
If compensating a high reactive power, the power generated by the SVGm may alter the mains voltage,
and depending on the installation conditions, those limits may be exceeded. In environments where
this can happen, a Low Vac mode can be programmed (see “7.6 - REACTIVE POWER OFFSET”) that keeps
the device from stopping as long as the mains voltage remains at 50% of its initial value.
The losses of the device are not optimized in this mode, so we recommend that this feature be used
only in the installations that require it.
The voltage drop can be estimated by assuming that the line impedance is inductive.
=
∆
2
∗ 2 ∗ ∗
Equation 1:Calculating the voltage drop.
Where L is the parasitic inductance of the line and the power transformer.
If the reactive power (Q) generated by the SVGm is capacitive, the voltage will increase with respect to
the initial value, and if it is inductive, the voltage will be reduced.
4.8.- FAST REACTIVE MODE
Note: Operating mode available with software versions DSP ≥ 1.61 and HDMI ≥ 1.2006.
The device has a Fast Reactive mode, which reduces the response time to half a network cycle (10 ms
in 50 Hz mains, 8.3 ms in 60 Hz mains). This is the recommended working mode in mains with rapid
load changes, such as welding machines or presses, as well as in installations where the goal is to
mitigate the flashing of lights due to voltage changes caused by reactive power peaks.
By reducing the response time, this mode compensates better for disturbances, at the expense of
increased energy consumption in the device. Because of this, we recommend activating it only if the
disturbances and the compensation target require it.
Fast Reactive mode can be activated on configuration screen “7.6 - REACTIVE POWER OFFSET”.
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