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30-03-2022 #1
I suspect nothing and the spindle was faulty. However I think the max Freq should be set to 400 Hz if you want 24000 rpm ie 60x400 and the base to whatever the min speed is.
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30-03-2022 #2
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30-03-2022 #3
No, it doesn't, Isel doesn't make VFD's they just supply another manufacturer VFD that is set up to match their spindle. Any suitably sized VFD with the correct setting will work fine, with any spindle from any manufacturer.
The problem could be a number of things and like John says most probably faulty spindle in the first place or incorrectly wired because just entering the wrong frequency wouldn't burn it out within 3s, it would squeal and complain but wouldn't kill it dead.
The base Frequency should have probably been 50hz or 60hz to suit your country's grid power. The Motor rating of 300Hz is the Rated HZ which will provide the rated power and going higher would just make it spin faster but with lower power, but go too high and you would get overheating, etc.
My suggestion is to contact Isel and ask which VFD they use and what settings they use.-use common sense, if you lack it, there is no software to help that.
Email: [email protected]
Web site: www.jazzcnc.co.uk
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31-03-2022 #4
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30-03-2022 #5
But 300Hz would only give 18'000rpm (ignoring rotor slip), not the indicated 23'000rpm in the torque curve.
Going by the same torque curve, I'm guessing what they mean by the cut-off frequency is the frequency at which the spindle enters constant power output, in which case Base Frequency should be set to 300Hz, with Max frequency being 400Hz.
The only way the spindle could be damaged that quickly, is if the VFD was driving too much current through it.
To do that would take the power/current being set far too high (would need to be using a well oversized VFD), the initial test speed being quite slow (or the spindle being locked/stalled), and the base frequency being set too low (even if the power was set too high, the back emf from an undersized motor would automatically limit current, unless the base current was set too low, which would mean the VFD would output a higher voltage than needed and drive excess current through the spindle).
There is also the possibility DC injection could cause the same result, but again would involve wrong power settings and an oversized VFD.Avoiding the rubbish customer service from AluminiumWarehouse since July '13.
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