Recently, a VARIMAT V2 customer came to us because his welder had shorted out and would no longer turn on. We quickly found the cause of the issue. The plug that connects to the machine’s power cord was changed from the 3-pronged 240V Leviton Wetguard plug we installed on the machine before it was sold to a clamp plug.
Topics: Power Supply
Power quality and availability can vary from construction site to construction site, which is why commercial portable generators are a must for contractors. With a reliable power source, you'll be better positioned to get projects done on time, keep your tools running consistently, and limit downtime, all of which can combine to help make your business more profitable.
Topics: Power Supply
When evaluating commercial or industrial portable generators, it’s important to consider their noise levels, as many cities have local noise ordinances in place with which construction equipment must comply.
Topics: Power Supply
In an effort to cut down on air pollution, national and state organizations have instituted legislation that regulates the amount of carbon released into the atmosphere by engines.
Topics: Power Supply
When you’re on a job site, a reliable power source is critical to productivity and, ultimately, profitability. A faulty or malfunctioning portable generator can cause poor tool performance, delays and lost revenue.
Topics: Power Supply
There is a lot to consider when purchasing a portable generator for your commercial and roofing needs. To help, we’ve answered some of the most frequently asked questions we get about portable generators.
Topics: Power Supply
Improper or careless use of a portable generator can result in potentially serious safety hazards, including personal injury, electrical shock, and fire. Alleviate these dangers, and achieve safe, reliable performance, by adhering to the following 10 precautions.
Topics: Power Supply
With proper operation and regular maintenance, high-quality power tools can last well beyond their warranties. Unfortunately, tools with advanced electronics and circuit boards—such as the Leister VARIMAT V2—also require the right power sources for maximum life and performance.
When using an AC-power commercial portable generator, the consistency of the electric current is specifically important. On most generators, this is listed as total harmonic distortion (THD). The higher the THD, the greater the fluctuations in current flow. If THD is too high, it will overheat critical components, and if it is too low, it will negatively impact performance.
In this post, we will explain total harmonic distortion’s impact on power equipment, and detail what you need to consider when purchasing a commercial portable generator for your construction site.
Alternating current (AC) gets its name from the fact that the electronic particles within the current regularly fluctuate polarity from positive to negative. This gives the flow of electricity the appearance of a sine wave (see below).
Source: Associated Power Technologies
In ideal conditions, the sine wave alternates between positive and negative consistently over a specific time period. However, a variety of factors can cause small distortions or irregularities, which show themselves as spikes and dents (see below).
Source: Associated Power Technologies
In the most basic terms, total harmonic distortion is the average percentage of how much an electrical current’s sine wave differs from what it would be under ideal conditions.
So in essence, the lower the THD, the more consistent and clean the power supply.
Power sources with higher harmonic distortion overheat, short out and damage the internal electrical components of power equipment.
According to IEEE Standard 519, Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems, when a power source has higher levels of harmonic distortion the result is subtle malfunctions in the equipment that in some cases may have serious consequences.
To further emphasize the point, Associated Power Technologies in their paper, Total Harmonic Distortion and Effects in Electrical Power Systems, states that, “Unwanted distortion can increase the current in power systems, which results in higher temperatures in neutral conductors and distribution transformers... If left unchecked, increased temperatures and interference can greatly shorten the life of electronic equipment and cause damage to power systems.”
While this may not be a big deal for your basic power tools, a tool with a digital interface and advanced circuitry could:
Ultimately, the quality of your work will be impacted, and repeatedly poor power will cost you hundreds or thousands of dollars in repairs and replacement parts.
When shopping for a commercial portable generator, most manufacturers will list the THD on the product specification table or on a label.
The IEEE Standard 519 recommends that computers and allied equipment, such as programmable controllers, use an AC power source with no more than 5% harmonic voltage distortion, with no single harmonic being more than 3%.
By making the investment in a clean, consistent power generator today, you will end up saving yourself time and money down the road.
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Topics: Power Supply
