Hardinge Lathe CNC Retrofit/Conversion

**Chaz** · 07-02-2021

Originally Posted by JAZZCNC

Surely it's only the drive you require not the motor.? this wouldn't cost a fortune to replace. What is the model number of the drive, so I can check it against mine which does supposedly work with single-phase, though I haven't tried it, and will use 3 phase anyway?

Thanks.

I thought so too, so queried with them, reckon no go as the motor is wired for 380V. I did notice when I connected it they only expose 3 wires, so cant change from high to low voltage.

The drive is SZGH-S4T7P5, the motor is SZGH10-3-48-7.5/11-4-1500.

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Thanks

**Hood** · 03-02-2021

Shame it is not bigger but sadly too small for me.

Would a rotary not be a cheaper solution? Not sure what input power you need for that drive though, so possibly not.

**Chaz** · 03-02-2021

Originally Posted by Hood

Shame it is not bigger but sadly too small for me.

Would a rotary not be a cheaper solution? Not sure what input power you need for that drive though, so possibly not.

Not sure, but I expect pretty substantial.

I would try running it off my 220V to 380V invertor but its not worth damaging it, so too risky.

**Hood** · 03-02-2021

A rotary would be my choice but just having a quick look they are quite steep in price nowadays. Years ago I had a 5hp static and fitted an idler motor to it and it worked great, nice clean (proper) 3 phase.

I will ask around and see if anyone needs a spindle motor/drive that size but I think most of the people I know, like me, require 12kw or more.

**Chaz** · 04-02-2021

Originally Posted by Hood

A rotary would be my choice but just having a quick look they are quite steep in price nowadays. Years ago I had a 5hp static and fitted an idler motor to it and it worked great, nice clean (proper) 3 phase.

I will ask around and see if anyone needs a spindle motor/drive that size but I think most of the people I know, like me, require 12kw or more.

Thanks, appreciated.

**Chaz** · 05-02-2021

Double Post

**Hood** · 07-02-2021

Would you get a single phase drive for a motor that size?
For servo drives 3Kw seems to be about the max for single phase and I would have thought spindle drives would be the same.

**Chaz** · 07-02-2021

Originally Posted by Hood

Would you get a single phase drive for a motor that size?
For servo drives 3Kw seems to be about the max for single phase and I would have thought spindle drives would be the same.

Good question. I hope so, otherwise Ill need to make a plan here.

I run my 6.8 KW 24K HSD spindle on single phase with an inverter. Its a 380V version but I know you can specify 220V at that power.

**JAZZCNC** · 07-02-2021

Originally Posted by Hood

Would you get a single phase drive for a motor that size?
For servo drives 3Kw seems to be about the max for single phase and I would have thought spindle drives would be the same.

When I asked SZGH Mike told me the drive I have could be run on a single-phase supply but at a de-rated motor output.(approx 20%) Not that it matters because I will be running it on 3 phase anyway.

**Chaz** · 07-02-2021

Originally Posted by JAZZCNC

When I asked SZGH Mike told me the drive I have could be run on a single-phase supply but at a de-rated motor output.(approx 20%) Not that it matters because I will be running it on 3 phase anyway.

And that was my understanding too. What I did not pick up was that the version I ordered is 380V only. Ive had words with them, I intend to order more stuff - then they quoted on Friday for 220V 3 Phase despite me reminding them I only have single phase.

They suggested they could supply one of the items at cost as a 'sorry' for the issue but then tell me how much more complicated / expensive the 220V version is, so perhaps no discount after all. Lets see, Ill probably hear from Susie in the morning.