On Motor VFD's
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- Опубликовано: 1 окт 2024
- I discuss the trend I see with VFD packages in the Commercial/Industrial HVAC systems. These are things to be aware of and prepared for.
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The bell and gossett ecocirc pumps have the pump/VFD combo for a long time too. They have a high failure rate, I’d rather have a separate VFD and motor for more flexibility. The new ABB 580’s are super efficient with low harmonic distortion, which seems to be the new problem in modern frequency controlled equipment.
The Grundfoss Magna and Alpha's are really nice. Their GPM calculations are not quite on the money, but its not too bad
Probably they will have a spring loaded stab in contact covered with di-electric grease. That way it maintains constant pressure and won't come loose or corrode, I think it is a great idea especially with cooling tower pumps that have to operate under low load when it is cold outside so you can slow them down and keep the chiller running.
There will be no universal or aftermarket parts available.. not a fan
Very interesting
Circuit boards are not big fans of vibrations. I'm sure it'll last out their warranty but i find it hard to believe it'd ever outlive an identical wall-mounted model.
I commented on more of an emphasis on drive signals and speed, I’m wondering where the signal comes from and how to identify the signal and whether or not the signal requested is commensurate to the actual correct speed of the compressor
What about interference? Isn't that why they space vfds apart further from the motors and other vfds?
Wilo pumps are better!