VRD- Voltage Reduction Device
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The VRD (Voltage Reduction Device) function is a safety feature built into some welders. Here’s what it means and why it’s useful in 4 easy-to-understand parts:
1 - What is VRD, its function and its objective?
- Function : The VRD reduces the output voltage of the welding machine when it is not in active use (i.e. when the arc is not ignited).
- Purpose : The primary purpose of this feature is to improve user safety by reducing the risk of electric shock, particularly in humid or harsh environments where accidental contact with the electrodes could be dangerous.
2- How does it work?
- When the Arc is Extinguished : The output voltage is reduced to a safe level, typically below 20 volts, minimizing the risk of electric shock.
- When Arc Is On : The VRD temporarily disables this voltage reduction to allow efficient welding, providing the full voltage needed to create and maintain the arc.
3- Advantages of the VRD function
- Improved Safety : Significantly reduces the risk of electric shock to the user, especially in potentially hazardous working conditions.
- Standards Compliance : Helps comply with safety standards and industry regulations, especially important on construction sites and maintenance sites.
4- Practical Example
Let's say you're working in an environment where there's moisture or water, like in a water treatment plant or on an outdoor construction site in the rain. With a welding machine with the VRD function:
- Safety : When you are not welding, the output voltage is automatically reduced, reducing the risk of electric shock if you accidentally touch the electrodes.
- Efficiency : As soon as you start welding and the arc is established, the welder supplies the full voltage needed for efficient welding, then reduces the voltage again when the arc goes out.
In Summary
The VRD function on a welding machine is an important safety feature that reduces the output voltage when the machine is not in active use, thereby minimizing the risk of electric shock and increasing user safety in various work environments.
