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Jarrett Affolter, Ingersoll Rand

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10/12/2018

The “Compressed air and VFDs: Get the best from your system” webcast was presented alive on Oct. 9, 2018, by Jarrett Affolter from Ingersoll Rand. The webcast can be begin here. He supplied accounting answers to some of those questions that weren’t addressed from the webcast attendees:

Question: Discuss amount and allowances of application a receiver vs. application beyond aqueduct to abundance air.

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Compressed Air Drying from CompAir | CompAir UK – air compressor dryer installation diagram | air compressor dryer installation diagram

Answer: The amount of installing ample aqueduct in the arrangement usually would be abundant college than added receivers. Account of low burden bead would charge to be evaluated as able-bodied as the advantage for approaching advance in the arrangement and if the beyond aqueduct would account added burden bead as a action of added air appeal in the pipe.

Q: Discuss amount and allowances of application a bigger compressor vs abacus receivers to abundance air.

A: It’s abundant added cost-efficient to use added accumulator in systems with ample aberration in amount vs. installing a bigger compressor. Systems with a added connected amount contour would account from a appropriately sized air compressor that can run in the “sweet spot” of its ability curve.

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Q: Discuss advantages and disadvantage to application air cooled compressors and baptize cooled compressors.

A: Air-cooled machines don’t crave a abstracted cooling arrangement that consumes ability and needs maintenance. Cleaning air cooled calefaction exchangers is abundant added amount able as well. Cooling baptize affection is consistently a affair and charge be maintained aural defined ambit which can about-face costly. The account of not accepting melancholia temperature changes, or the furnishings of acute temperatures is area baptize cooled becomes ideal. This allows for a added predicted ascendancy of temperatures and gives air analysis accessories (dryers and filters) a connected basin temperature for a added all-embracing aeroemism air activity ability profile.

Q: Accepting capricious abundance drives (VFDs) and the motor ramps up and down, what is the best “dead band” we should set the burden in allotment of the pressure?

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A: Best VFDs accept a “target” burden you set to accept the VFD hover about it by capricious speeds. The added connected is the unload or auto stop burden that shuts the apparatus bottomward back the arrangement isn’t application any air. If the arrangement has a capricious load, which after-effects in unloaded operation or abbreviate cycling, set the unload or auto stop burden to the accomplished amount the arrangement will acquiesce for. If the arrangement has almost connected amount and accordingly auction or shutting bottomward is not actual frequent, punch the unload or auto stop burden to aloof a few PSI aloft the ambition to acquire as abundant activity ability as possible. These ambit may charge to be activated over time to antithesis activity ability and cycling concerns.

Q: What about if you accept a arrangement that is adapted 16 hours to use an VFD, what for the others 8 hours that the appeal is actual low?

A: Admeasurement a VFD to awning the low-demand profile, and again admeasurement a anchored acceleration to run as abject amount for the 16hrs with the VFD accent the pressure.

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Compressed Air Dryer and Filtration Installation – YouTube – air compressor dryer installation diagram | air compressor dryer installation diagram

Q: Our exhaustion starts at aerial acceleration and slows via VFD and runs a minimum run time. What is the minimum appropriate run time?

A: It depends on the time amid shutdowns. All motors will accept a absolute of how generally they can alpha in an hour. Traditionally, this is 6 times an hour for best automated motors. The architect of the motor will accept the authentic number. If the run time allows the compressor to beat the best starts per hour, the run timer needs to be adapted to atone and accumulate the starts beneath the max alpha parameter.

Q: What is the recommended aggregate of the air catchbasin for the VFD compressor?

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Shop Air Compressor System Design – air compressor dryer installation diagram | air compressor dryer installation diagram

A: There is no such affair as too abundant aggregate in a aeroemism air system. The alone absolute constraints are amount of the tank, allowance to locate it, and the accession costs.

Q: What are some times that you would use a anchored acceleration over a capricious speed?

A: If the amount contour is constant, a VFD compressor does not accept abundant value. If the ambiance is not suitable, a anchored acceleration is the appropriate choice.

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Q: If the chump is adverse account issues with replacing their absolute old absolute compressor with a new capricious acceleration drive (VSD) compressor, is it recommended to advance installing VFD alone on the absolute motor forth with ascendancy console and acquittal sensor instead of affairs a new unit?

A: Best absolute air compressors can account from a VFD “retrofit”, about some capacity charge to be understood. Does the absolute motor assignment with a VFD. If not, it will charge to be upgraded to a motor acceptable for VFD operation. Next, the automated limitations of the air end needs to be advised to actuate the akin of about-face bottomward it can accomplish with. 

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Typical Installation for Refrigeration Compressed Air Dryer | IATT .. | air compressor dryer installation diagram

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Typical Installation for Twin Tower Compressed Air Desiccant Dryer .. | air compressor dryer installation diagram

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