nathon918
Addicted to ArboristSite
cheapest phase converting 15hp VFD I have found thus far:
MA7200-2015-N1
the vfd in your link states 3 pahse input...
why dont you just get a static phase converter? theyre cheaper than a vfd...
cheapest phase converting 15hp VFD I have found thus far:
MA7200-2015-N1
Well my thought is the vfd is a much nicer solution, and I hate the 1/3 power loss. Could just buy a single phase 5hp motor in that case. The vfd I linked showed the ability to take a single phase input on another site, but with half the rated output.
Hddnis, I believe I found what you were talking about, a vfd rated at full output with a single phase input. PC1-75
My issue is I can get a good deal on certain motors and VFD's through work, but I am leaving my current position shortly so the motor / VFD decision I am trying to make asap.
The reasons towards leaning towards a VFD big enough to run a 10HP 3 phase motor are: More flexibility if I need to go from my current 7.5HP motor to a 10HP, ability to soft start the motor and adjust speeds, thus adjusting ram speed, better availability of cheaper motors in the future (3 phase vs single phase).
I am aready ahead as the motor I got was cheap. The VFD would be a big commitment, but would open possibilities. I agree with it complicating things, but I have great luck with VFD's at work and the wiring / setting up parameters is pretty easy.
My big hangup on the large VFD is the fact that it wants a 100A breaker as per the manual. If my 7.5HP 3 phase motor only has 20 FLA, I do not know why a 50A breaker would more than suffice. My future design decisions will not be as hasty once I nail down the motor and or VFD purchase.
I believe if I go with this 10HP capable VFD I will leave all my options open. Say I run the 7.5HP motor and have electrical issues, I can always downsize to a 5HP. It's a lot of cash, but in my opinion should last a very long time if wired correctly and it's kept from any moisture.
If I go with the 22GPM pump and have trouble turning it with the 7.5HP motor, I would then need to see if I could upsize the motor to 10HP or downsize the pump. I believe the resale on any of these components should be high if I had to resell a component.
Does anyone have a good source for power cable, I looked at McMaster today and 3 conductor 4 gauge is salty!
Seems like way more HP than necessary... My father built one years ago and it only has a 1HP single phase 220v motor. It's got a 4" cylinder and runs 13-14 sec cycle time. He is actually ready to sell it now that we have an electric Supersplit. If you want speed build or buy a SS. Just seems like overkill to run 7.5-10hp to go from 13-14 sec cycle time to 10 sec cycle time.
whats the length of the cylinder??
no load cycle time?
unless its really short, or very low pressure, theres no way a 1hp motor will cycle a 24-30 inch cylinder in 14 seconds, @ 2500-3000 psi
it simply doesnt have enough power to turn the size pump required for that cylinder @ that cycle time...
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