Tag Archives: IGBT

Specifying 18 Pulse Variable Frequency Drives

Posted on June 21, 2011 by deltaautomation

  18-Pulse VFDs: To specify, or not to specify… by: Vann Barden We recently got the opportunity to quote on several large VFDs for a proposed raw water pump station.  We have a long history with the water treatment plant … Continue reading →

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“Prevent Defense”- Variable Frequency Drive Failures That Are Easily Preventable

Posted on October 1, 2010 by deltaautomation

By Joe Sarver The car analogy for the story that follows would go something like this: The oil pan drain plug becomes loose and enough oil is lost to greatly increase friction among the moving parts. The engine overheats and … Continue reading →

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Variable Frequency Drives Preventive Maintenance: Statistics Tell the Story

Posted on May 26, 2010 by deltaautomation

Since designing and implementing a formal preventive maintenance (PM) program for variable frequency drives (VFDs) just under two years ago, Delta Automation has developed some interesting statistics related to the operational condition of VFDs. The generally accepted practice for most … Continue reading →

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The importance of having an authorized service provider sell, install, and start up your VFDs

Posted on May 20, 2010 by deltaautomation

Delta Automation, Inc. was requested by a large VFD manufacturer to go on-site and evaluate a VFD that had been giving a client trouble since it’s installation by another vendor over a year ago. This is a manufacturer that has … Continue reading →

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Proper phasing of a VFD with bypass

Posted on May 5, 2010 by deltaautomation

A local college contacted Delta Automation with a request for on-site service to repair a VFD on the hot water pump for their heating system. This heating system was for the gym where a basketball game was scheduled for later … Continue reading →

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TECH TIP: Hydrogen Sulfide

Posted on April 30, 2010 by deltaautomation

By Joe Sarver Hydrogen sulfide is a chemical compound with the formula name H2S. In simple chemistry terms it’s two atoms of hydrogen bonded with one atom of sulfur. Hydrogen sulfide gas is commonly associated with the smell of rotten … Continue reading →

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Maintenance: Preventive vs. Corrective

Posted on April 30, 2010 by deltaautomation

By Joe Sarver You do the math—you make the call In the midst of one of the rainiest falls on record, a Delta field service engineering team was called in to a municipal waste water treatment pumping station to troubleshoot … Continue reading →

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