Cheers, Chaz, will see what he can do price wise.Quote:
Originally Posted by Chaz
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Cheers, Chaz, will see what he can do price wise.Quote:
Originally Posted by Chaz
From memory they were around $400 ish. But cant find an invoice from before.
$219 all in for 4kw 220 to 380v, but I guess I will have to pay duty, VAT etc. on that when it lands.Quote:
Originally Posted by Chaz
Sounds cheap. You sure its the same unit and from Richard? You may or may not be caught for duty.Quote:
Originally Posted by Richard
Quote came direct from John Pei. including shipping. Pretty much exactly the same as other ebay and ali express sellers. If this guy has a good rep, then seems like a good deal.Quote:
Originally Posted by Chaz
Just need him to mark it up as a gift! :biggrin:
Awesome.Quote:
Originally Posted by Richard
Ive bought 2 already - they are good. Ive got a copy of the manual if you need it, John can also supply.
I almost cooked my spindle with one, make sure you check all parameters before trying to run anything.
I run a lathe with 3HP motor off a VFD with voltage-doubler input. It's a bit of a bodge put together some years ago by a company now out of business. The nice bit is an ABB inverter originally designed for 415V/3P in and out. The third party replaced the input 3-phase bridge with a voltage doubler running off 240V/1P in. It works fine, except towards the upper end of its load capacity. My lathe has a mechanical variable-speed arrangement so I leave the VFD on 50Hz but as the VFD load increases with increasing lathe speed, somewhere north of 2K RPM the DC bus ripple voltage trips the fault-detection circuitry and the thing shuts down with an "input phase error" message (or similar - haven't seen it for a while as I tend to keep the speed down). I'm assuming that the bus capacitors are being, in effect, charged at 25Hz and the voltage sag between input pulses becomes too great.
I have looked longingly at these Ecogoo devices, and I wonder if they actually use a switching voltage boost on the input rather than a simple passive doubler. Also wondered about just putting a chunky transformer plus bridge rectifier in front of my existing VFD but haven't stumbled across anything cheap enough to play with yet.
Ive got 2 at home. One is powering my surface grinder which is not being used at the moment. If you wanted to take a look at the VFD (non destructive of course, let me know).Quote:
Originally Posted by Neale
Neale, Drives Direct are more than willing to provide you with such a setup new, at fantastically wallet emptying prices.
I have looked at building something, but I've never been able to find what VFDs are suitable for online/load switching.
There's no fun in that! Attachment 26792Quote:
Originally Posted by Chaz
I spoke to Direct Drives. Pricy and when you mention CNC they say 'no sure if that load would work'. So clearly too risk / pricy to experiment.Quote:
Originally Posted by m_c