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Please review our Updated VFD Preventive Maintenance Program
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Delta Hosts Drive and Controls Show
In late July, Delta Automation hosted an industrial Drives and Controls Rolling Roadshow. It is a great show piece presenting the industries newest drive products. Although primarily focused on AC drives, it also featured a DC drive as well. The onboard demonstrations were the true stars of the show, particularly the Ultra-Low Harmonic Drive setup, comparing a drive only, a drive with a line/load reactor, a drive with an active (dV/dT) filter to the ULH drive. The results were demonstrated visually, real-time, on a harmonic disturbance analyzer.
Customers were able to walk through the truck speaking with the representatives and interacting with the demos at will. Lunch was provided and we were pleased to have such a great customer response to the event. The weather was hot and humid, but thankfully the storms held off throughout the show.
Posted in ABB, Delta Automation, Delta company news, Uncategorized, VFD
Tagged AC noise, analyzer, control, DC, drive, dV/dt filters, filters, harmonics, industrial & commercial, line reactors, load reactor, VFD
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Utilizing Inverter Duty Motors with VFDs
This is a good article from the U.S Department of Energy discussing the effects of VFDs on non-inverter duty rated motors. It discusses the insulation class recommended, in this article, “class H” is suggested. I previously had been recommending at a minimum, “class F” motor insulation. The article further discusses the use of load reactors and dV/dt filters to reduce the damaging effects upon motors, and mentions that these issues are especially high when running multiple motors on one VFD.
https://www.energy.gov/sites/prod/files/2014/04/f15/motor_tip_sheet14.pdf
Typically when clients ask about running non-inverter duty rated motors with a VFD, they want to know if the motor will fail. The answer is: eventually. I inquire about the criticality of the application. Is this an application that demands constant up-time? If so, then it is wise to replace the motor when installing the VFD. Some VFD/motor manufacturers will extend their warranty if both are replaced simultaneously. If the application lends itself to some down-time, such as a multiple pump application, then run the motor until it fails, to maximize its’ initial ROI. This may be weeks, months or years later, but it will eventually fail. However, the best practice is still to be certain that the motor is rated for inverter duty to insure the longest lifespan. As the above article states, a work-around to this dilemma, rather than replacing the motor, is to install a load reactor or dV/dt filter between the VFD and the motor(s). Especially if there are multiple motors and/or the motor leads (commonly called “T” leads) are longer than about 100 feet. In these two particular applications (multiple motors or long leads), a reactor or filter is a good practice even when the motors are rated as inverter duty. Different VFD manufacturers recommend different maximum cable lengths before requiring reactors or filters. Check with the manufacturers recommendations to be certain.
Posted in Delta company news, Delta service advantages, Tech Tips, Uncategorized, VFD
Tagged class F insulation, class H insulation, dV/dt filters, failed vfd, filters, inverter duty motors, line reactors, long motor leads, long T leads, motor, multiple motor applications, Single Phase VFD, variable frequency drive, VFD, vfd fault
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Delta Hosts Members of ECPI’s Megatronics Program
Students and faculty from ECPI’s Megatronics program visited Delta Automation to get a view of what opportunities may exist in the field after graduation.
Posted in Delta Automation, Delta company news, Uncategorized
Tagged applications, ECPI, education, employment, feedback, PLC training, programming, Richmond VA., training, VFD
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Identifying ModBus Plus Connectors
Posted in Delta Automation, Delta service advantages, Modbus Plus, modicon, PLC, Tech Tips, Uncategorized
Tagged connector, drop cable, MB+, MBKT, Modbus Plus, Modicon, network, network certification, Ruggedized tap, Super Tap, Tee, terminator
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Happy Birthday, America!!!!!
Posted in Delta Automation, Uncategorized
Tagged 4th of july, America!, Celebrate, Delta, Independence Day, Richmond VA., USA
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A VFD for SINGLE PHASE MOTORS!
Delta Automation, Inc. has recently partnered with Invertek to supply, install and service their line of VFDs specifically designed for SINGLE PHASE MOTORS. This is a very niche, specific market that we here at Delta have been searching to fulfill for sometime. Many of our clients have requested this type of product, and up until now our only solution was to convert the motor to a 3 phase unit and VFD. Depending upon the frame size, this was not always the best possible solution and sometimes, just not possible at all. Now these clients utilizing these smaller motors will be able to reap the benefits of energy savings, energy rebates, mechanical wear and tear, and motor/equipment protection just as the large motor users have enjoyed. Please contact Delta to provide you with more information or a quote!