Recommended Power Supply for 400W Spindle

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aeleus
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Recommended Power Supply for 400W Spindle

Post by aeleus » Thu Oct 23, 2014 6:54 pm

I recently purchased a 400W Chinese spindle. I need a power supply for it.

Specs for the motor:
48v DC
400W

Specs for driver controller:
12V-52V
10A (15A peak)
500W (up to working voltage)

The 400W power supply offered by Inventables seems like a good match. My experience with power supplies is mostly in the PC world where you usually give yourself a little bit of head room. Would I be better off going with something more in the 500W range?

Any recommendations?
ShapeOko 2 #6502 w/ NEMA 23 (140oz) motors (X and Y), Acme Screw Z-axis, Arduino/grblShield/grbl v0.9g
Spindles: Dremel 395; 400W BLDC

cvoinescu
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Re: Recommended Power Supply for 400W Spindle

Post by cvoinescu » Thu Oct 23, 2014 7:24 pm

Headroom is good, especially bearing in mind that the spindle will draw more than 400 W if loaded a lot. It's rated to withstand a load that causes it to draw 400 W, but it's not limited in any way. Your speed controller probably has a current limit, but if it's the typical 10 A, then it limits power to 480 W. On the other hand, most of the time, the spindle will draw much less than 400 W (should be 50 W tops when not loaded, for instance). It really depends on the behavior of the supply when overloaded. Most will let you go 10%-20% over briefly, but almost all will cut out suddenly when overloaded above that. You don't want the spindle to just freeze when it bogs down a little, so I'd say go for a little headroom if you can. On the other other hand, if the controller limits current, it's unlikely that the supply will get overloaded. So, I don't know. Ideally, you would be able to adjust the current limit in the speed controller to yield exactly 400 W (that is, to 8.33 A), protecting both the supply and the spindle, and then the 400 W supply would work perfectly.
Proud owner of ShapeOko #709, eShapeOko #0, and of store.amberspyglass.co.uk

dave_the_nerd
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Re: Recommended Power Supply for 400W Spindle

Post by dave_the_nerd » Thu Oct 23, 2014 7:25 pm

I would want something with a higher rated capacity than the spindle because of startup surges with electric motors.

But that's just a suspicion based on what my grandpa told me about vacuum cleaners and circuit breakers. I don't know if the PSUs are designed with that in mind or not.
Shapeoko 2 # 6651: 500x1000mm, Acme screw and belt drive Z-axis, DW660 w/ IC mount, Arduino/grblShield w/ gCode 0.9g and 3D-printed electronics enclosure.

cvoinescu
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Re: Recommended Power Supply for 400W Spindle

Post by cvoinescu » Thu Oct 23, 2014 7:37 pm

They are designed with a little of that in mind (not the full brunt of a motor starting up from standstill), but what saves the day is the current limitation in the controller.
Proud owner of ShapeOko #709, eShapeOko #0, and of store.amberspyglass.co.uk

aeleus
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Re: Recommended Power Supply for 400W Spindle

Post by aeleus » Thu Oct 23, 2014 7:58 pm

The controller is an HX-WS400. It claims to have "over current circuit protection" and "soft switch function".

I hooked it up to a 24V PS to test it, and it does seem to have a soft-start feature. It gradually spins up rather than kicking on like my router does. But that may be due to the lower voltage being supplied.

Given all that, am I wasting my money getting a power supply rated at higher than 400W?
ShapeOko 2 #6502 w/ NEMA 23 (140oz) motors (X and Y), Acme Screw Z-axis, Arduino/grblShield/grbl v0.9g
Spindles: Dremel 395; 400W BLDC

dave_the_nerd
Posts: 143
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Re: Recommended Power Supply for 400W Spindle

Post by dave_the_nerd » Thu Oct 23, 2014 8:40 pm

aeleus wrote:The controller is an HX-WS400. It claims to have "over current circuit protection" and "soft switch function".

I hooked it up to a 24V PS to test it, and it does seem to have a soft-start feature. It gradually spins up rather than kicking on like my router does. But that may be due to the lower voltage being supplied.

Given all that, am I wasting my money getting a power supply rated at higher than 400W?
Depends - do you intend to upgrade your spindle or run other stuff off of the same power supply? Might it be cheaper in the long run to buy bigger up front?
Shapeoko 2 # 6651: 500x1000mm, Acme screw and belt drive Z-axis, DW660 w/ IC mount, Arduino/grblShield w/ gCode 0.9g and 3D-printed electronics enclosure.

aeleus
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Location: Washington, DC

Re: Recommended Power Supply for 400W Spindle

Post by aeleus » Thu Oct 23, 2014 8:47 pm

dave_the_nerd wrote: Depends - do you intend to upgrade your spindle or run other stuff off of the same power supply? Might it be cheaper in the long run to buy bigger up front?
You make a good point. It's a small extra investment to have the extra power if I need it.

That said, anyone recommend a good supplier for a 48V, ~500W power supply? Amazon has very few options and most of the offerings on ebay are from overseas with long shipping times.
ShapeOko 2 #6502 w/ NEMA 23 (140oz) motors (X and Y), Acme Screw Z-axis, Arduino/grblShield/grbl v0.9g
Spindles: Dremel 395; 400W BLDC

dave_the_nerd
Posts: 143
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Re: Recommended Power Supply for 400W Spindle

Post by dave_the_nerd » Fri Oct 24, 2014 3:24 pm

aeleus wrote:
dave_the_nerd wrote: Depends - do you intend to upgrade your spindle or run other stuff off of the same power supply? Might it be cheaper in the long run to buy bigger up front?
You make a good point. It's a small extra investment to have the extra power if I need it.

That said, anyone recommend a good supplier for a 48V, ~500W power supply? Amazon has very few options and most of the offerings on ebay are from overseas with long shipping times.
I bought from Amazon, but it was also shipped from overseas with a very long shipping time.
Shapeoko 2 # 6651: 500x1000mm, Acme screw and belt drive Z-axis, DW660 w/ IC mount, Arduino/grblShield w/ gCode 0.9g and 3D-printed electronics enclosure.

CastIrony
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Re: Recommended Power Supply for 400W Spindle

Post by CastIrony » Fri Oct 24, 2014 4:29 pm

Shapeoko 3 #192 - Complete! Needs limit switches.

aeleus
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Joined: Wed Oct 01, 2014 11:46 pm
Location: Washington, DC

Re: Recommended Power Supply for 400W Spindle

Post by aeleus » Fri Oct 24, 2014 7:42 pm

After much searching, I went with this one:
http://www.ebay.com/itm/281371042142?_t ... EBIDX%3AIT

480W, good price and free shipping from Kentucky. We'll see how it works out.
ShapeOko 2 #6502 w/ NEMA 23 (140oz) motors (X and Y), Acme Screw Z-axis, Arduino/grblShield/grbl v0.9g
Spindles: Dremel 395; 400W BLDC

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