Spindle 2?

[John S]

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).

The VSX-75 is a 1 Hp model inverter and takes 7.2 amps with single phase input.

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.

.

[irving2008]

The VSX-75 is a 1 Hp model inverter and takes 7.2 amps with single phase input.

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.

.

thanks for that info John.. my motor is rated on the plate as 1.5HP but seems to work OK on that VFD, it doesnt even get hot (I do have a small fan on the heatsink but it really doesnt need it)... maybe for the lathe its OK as its not running for any significant time and the load is minimal (I cant do big cuts its not that rigid). the motor I have for the mill is 1HP and a fairly recent one (<10y old). Not fitted yet as I need to make some brackets.

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!)

[Ross77]

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....

[Ross77]

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

[John S]

Decent bargain, they are good inverters, not really any bad modern ones about.
Mitsubishi's can be a pig in that they often sell the programming panel and filters seperate so it adds up to ££££.

You should have no problem with this one.

.

[Ross77]

Phew, thats a relief, I didnt even google the manufacturer (not like me), saw it and had to go out, so put £50 on it just in case.

What would be a safe motor rating to use with it? Or will the instructions tell me...

[John S]

Technically anything up to 1 HP but most can be programmed for 150% overload safely so it will run a 1 1/2 HP but may trip under hard load.

I have one of the 1 1/2Hp Chinese spindles here running off a 0.55Kw [ 3/4HP ] IMO Cub inverter, the cheap one, programmed for 150% overload and it runs fine with up to 6mm cutter in it.

Been running test cycles with this for about 4 hours, non stop at 24,000 rpm and no problem although it is a bit small and I wouldn't recommend it for continuous use or any larger cutter.