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Voltage Sag Generator & Simulator

The Voltage Sag Generator & Simulator (VSG) is a voltage sag/swell generator combined with a built-in data acquisition system. It is a powerful diagnostic tool for determining the ride-through characteristics of industrial processes when subjected to sags in powerline voltage.

The VSG is used as diagnostic tools for industries and electrical utilities who wish to conduct voltage sag testing to determine whether equipment complies with standards such as SEMI F47 and IEC 61000-4-34.

Omniverter's VSG is based on original technology developed by EPRI over many years. During testing, the data acquisition system monitors and records the equipment response during the predefined voltage sag.

Key Features:
  • Generate 1-phase, 2-phase or 3-phase sags of predetermined depth and duration
  • Solid-state switch design for seamless transitions
  • Three phases are independently variable, allowing unbalanced sags to be generated
  • 360-degree point-on-wave control
  • Captured waveforms can be saved in any of several formats, including CSV and jpg
  • Advanced data acquisition system with reporting and data export functionality
  • Variable Frequency Drive manufacturers
  • Semiconductor & other industries testing low-voltage ride-through (LVRT) capability of process lines or sensitive equipment
  • Academic & research entities
SEMI F47 Voltage Sag Generator
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Download VSG Single Phase Data Sheet


Download VSG Three Phase Data Sheet

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What is SEMI F47?

SEMI F47 was developed by the Semiconductor Equipment Materials International. SEMI F47 sets minimum voltage sag immunity requirements for equipment used in the semiconductor industry, whereby immunity is specified in terms of voltage sag depth and voltage sag duration relative to the nominal voltage level.

SEMI F47 &  IEEE 1668 Sag Immunity Curve

How can users benefit using the VSG?

With the VSG, the user can induce voltage sags of controlled depth and duration while monitoring voltages, currents, or other signals from within the process. This allows investigators to quickly identify vulnerable process components. Once the weak links have been identified, it is often possible to apply local ride-through solutions that are much more economical than whole-system power conditioning.

Where to connect the VSG and what external input are available?

The VSG is connected in series between the supply and the load. The VSG has low voltage and high voltage inputs. The VSG has 5 high voltage and 5 low voltage channels for external measurements. Some typical components to monitor duringa sag event can be DC power supplies, relays, contactors, and load currents.