Thread: Spindle 2?
10-06-2009 #11I'm a bit of a slut with power and such...I bought a 3KW VFD for £175 from Drives Direct at Nottingham.....via ebay (steal a bid when no-ones looking)
Still I supose its better to get it right first time, as you only end up buying lots of bits that might do, and speding more in the process.
How practical is it to move from machine to machine?
Patience is the key!
It's always worth looking at a 415-440vac one (just use a step-up transformer and a 440v motor like my lathe - the 1.5kw one I bought for <£20, and a spare for a tenner ) or, 240v ones that are described as three phase input (since almost all will work with single phase input).
A lot of people who use a VFD to power two machines fit a red 3 phase socket on a flying lead and use that to swap over.
If the machines are close some have a wall mounted socket and use two plugs, one per machine.
Big No No is NEVER unplug whilst running, OK to unplug whist plugged into mains and switch on but not running.
One thing to watch when sharing is the motor load in amps as these 'should' be set per motor.
Say you have a 2 Hp VFD and a 2 hp motor drawing 8 amps and a 1Hp drawing 4 amps. When you swap over you need to change the motor load parameter to match. Depending on the VFD there may be other functions to change as well.
.John S -
Typical, being the cheap skate that I am I thought I could save a few quid with the CHR spindle controller and a £10 speed controller. But looks like Im back the VFD route! :sad:
Then again, Bill what was that step up transformer system? I know you can step up the voltage but how dose the 3 phase bit work?:confused:
A 1Kw VFD needs a 16A circuit so not practical to put it on a 13A plug. My VFD is screwed to the wall between the lathe and mill and both motors are wired to the VFD through a big (30A three pole) two way switch. The VFD has two sets of parameters stored, one for each motor.
My lathe setup is 1.5hp AEI (c1965) 3-phase with a Jaguar VXS-75 VFD courtesy of eBay (£75 the pair, bargain).
10-06-2009 #16Bill what was that step up transformer system? I know you can step up the voltage but how dose the 3 phase bit work?
A 1Kw VFD needs a 16A circuit so not practical to put it on a 13A plug.
The next one up in the range is the 150 or 1.5 Kw which will run a 2 Hp motor and that requires 14 amp.
The later updated VXSM's take 10 amp and 16 amps respectively
The cheaper Mini series takes 6 amps and 10 amps respectively.
.John S -
The manual for the VSX-75 says it needs to be on a supply with a 16A surge rating and it did used to trip the 10A MCB on start (not every time tho) which is why its now on a 20A MCB (although a 15A would probably be correct except I couldnt find one at the time). Maybe it would work on a 13A plugtop but I reckon there be a few replacement fuses needed from time to time.
Incidentally there some useful info here on cable and MCB selection which shows, for example, that the 1.5mm 4 core cable sold by B&Q as central heating control cable is fine for a 1HP 3phase motor wiring up to 15m (not that you'd want to run that far anyway) - my VFD manual talks about 4mm cable (which is impossible to buy in short lengths!)
Wow! thanks everyone. I knew the electrical side was going to be a nightmare......
Looks like Im going to have to rewire the workshop now as well :cry:
On the motor side of things is it possible to get high rpm, I.e. 20'000 ish (router terretory) or will I need a special spindle. Just thinking that if I have to spend all this money then i'd better getter something that will cover all my needs (wood and metal) if possible.
I've been looking at the chinese vfd and water cooled spindle packages, they seem to good to be true....
Ups. got an itchy trigger finger and just bought One.
BRAND NEW TELEMECANIQUE ALTIVAR 31 MOTOR INVERTER DRIVE
MODEL No. ATV31HO75M2
STILL IN BOX
SINGLE PHASE TO THREE PHASE MOTOR INVERTER
INPUT 220V AC 50 Hz
OUTPUT 0.75Kw 1 HP 240V THREE PHASE
COMPLETE WITH INSTRUCTIONS AND CD
just under 60 notes with postage, 1HP ??? what have i done...Supose it will be ok for the little lathe
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