Mazak QT15 Power required

davestearman · Jun 14, 2017

I have purchased a Mazak QT-15 lathe and planning to move into the shop. Currently have 1 phase 220 power in the building. In the new section I have 125 amp single phase. Main shop has 220 200 amps. I am looking at a Perfect Phase electronic convertor rated at 20 HP and 64 amps output.

From what I can find Mazak wants 47 KVA supplied to the machine which is 123 amps at 220 three phase.

I understand if I change the parameters to slow down spindle ramp up and tool changer speed it will help.

My question is will this machine run on 64 amps or will I have to add more amperage and get a larger convertor?

If it won't run it what is the minimum I will have to have?

Thanks

Dave

ManualEd · Jun 14, 2017

The power requirements should be the absolute max that it can draw, but you'll never come close to that.

My SQT15 says it needs 120A@220v 3ph, but I was running it on a 60A 220/3ph breaker. I was running 85% spindle and 85% Z axis load for 1.5 minutes at a time drilling, plus rough turning and whatnot. Never had a problem, or needed to change spindle accel/decel.

I would go for a bigger PP than you think you need.
I don't think you'll ever find yourself saying "Oh geez, having all this extra power sure is a pain"

Pete Deal · Jun 14, 2017

Mine (1988 qt15) has been running for about a year and a half on a 70a breaker, 240v. Phase converter is a 30hp american rotary. No problems. About 6 months ago I did slow the accel/decel down but not because I had any problems it just seemed like a nice thing to do to go easy on my old lathe and hopefully keep it going for a long time. This change is done by changing dip switch settings on the spindle drive.

Mine has been an awesome machine so far.

davestearman · Jun 16, 2017

ManualEd said:
The power requirements should be the absolute max that it can draw, but you'll never come close to that.

My SQT15 says it needs 120A@220v 3ph, but I was running it on a 60A 220/3ph breaker. I was running 85% spindle and 85% Z axis load for 1.5 minutes at a time drilling, plus rough turning and whatnot. Never had a problem, or needed to change spindle accel/decel.

I would go for a bigger PP than you think you need.
I don't think you'll ever find yourself saying "Oh geez, having all this extra power sure is a pain"

I want to thank you guys for the info. I have been trying to decide how to handle this for a while.

Dave

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