HP server power supply 51.4V 57A for CNC steppers!!!

[daman]

I bought a HP server power supply. You can find these really cheap from eBay. I'll use it on my BF20L clone with 570oz steppers. The steppers have 2.5mH coil inductance so the voltage is good.

Images and instructions for activating the output:
http://picasaweb.google.fi/pasi.lassila/HPPowerSupply#

[Drools]

Very good info, how did you figure out which pins needed to be jumpered to activate the PS? I have 3 power supplies from an old IBM 720 server that I would like to get working.

[rcazwillis]

Originally Posted by daman I bought a HP server power supply. You can find these really cheap from eBay. I'll use it on my BF20L clone with 570oz steppers. The steppers have 2.5mH coil inductance so the voltage is good. Images and instructions for activating the output: http://picasaweb.google.fi/pasi.lassila/HPPowerSupply#

How did you connect the input power?

I started a thread yesterday on the same subject.
http://cnczone.com/forums/showthread.php?t=112634

[daman]

Originally Posted by Drools Very good info, how did you figure out which pins needed to be jumpered to activate the PS? I have 3 power supplies from an old IBM 720 server that I would like to get working.

The right info was on an RC forum. This saved some time so I did not have to reverse engineer it myself.
http://www.rcgroups.com/forums/showt...1005309&page=3

[daman]

Originally Posted by rcazwillis How did you connect the input power? I started a thread yesterday on the same subject. http://cnczone.com/forums/showthread.php?t=112634

I cut the end of a computer power cord. I then soldered the protective earth wire to the center tabs and the two other wires to the N and L tabs. I live in Finland so we have 230V AC on the wall sockets.

[diyengineer]

Model number?

[daman]

Originally Posted by diyengineer Model number?

From the PS label:
Series#: ESP120
HP Part#: 226519-501
Spare Part#: 406424-001

If you search eBay these are good search words: 253232, 226519, 3000W, 48V, ESP120

[diyengineer]

Thanks a TON! I actually just found them!

Could you connect these in series or parallel with the same exact model of powersupply? As in multiple?

[daman]

Originally Posted by diyengineer Thanks a TON! I actually just found them! Could you connect these in series or parallel with the same exact model of powersupply? As in multiple?

I don't see any point in connecting parallel since the PS already gives alot of current. Connecting in series will give you higher voltage. I've seen people connecting other models in series. The second power supply must have the protective ground unconnected and the PS metal case insulated.

See here some experiments of connecting power supplies in series:
http://www.rcgroups.com/forums/showp...&postcount=183

[diyengineer]

Originally Posted by daman I don't see any point in connecting parallel since the PS already gives alot of current. Connecting in series will give you higher voltage. I've seen people connecting other models in series. The second power supply must have the protective ground unconnected and the PS metal case insulated. See here some experiments of connecting power supplies in series: http://www.rcgroups.com/forums/showp...&postcount=183

Well for this 10HP RC motor i was looking at requires this exact voltage, except up to 8500watts max hahaha (150amps). I would need 3 units in parallel! :O