[jmc2010]

I'm in the middle of a build, and purchased an Antek PS-4N48R5 Toroidal power supply for my Ethernet smooth stepper (5v) and Stepper Motors (48v). I put the power supply in the enclosure last night and hooked up AC power to it. There are 2 120v connections for the TPS. I'm running 120v to it, so I only hooked up one. When I put my multimeter on the DC outputs, with no load on the supply, I couldn't really get a reading on the voltage. That was on both the 5v and 48v voltage regulator module. I was getting 36v on the AC input side of the (48v) voltage regulator though, and 12v on the 5v voltage regulator. Both of those had a steady output of power. Is this normal? I was afraid to plug my electronics into it without actually seeing what the output voltage was.

[cgo]

There is no regulator on that type of power supply , the voltage will drop as you load it down.
There is two primary windings , they go series for 240vac and parallel for 120 vac, make sure you get the phasing right on 120 vac or it will burn up the transformer.
You must use both windings under a load or the transformer will burn up.

Just testing, no load you can hook up just one primary. if you see around 33.6 vac on the transformer you will have 48 vdc after the filters, no load. Remember you are dealing with RMS for AC voltage, which is about 70% of the peak value ( 33.6 ac = 48 dc ).

[jmc2010]

make sure you get the phasing right on 120 vac or it will burn up the transformer.
You must use both windings under a load or the transformer will burn up..

Thank you, sir. I sure am glad that I asked. I've looked several time for documentation on how to hook the power up to that power supply, and nada. So I need to connect both red wires together, and run them to one leg of the AC switch that I installed in my enclosure, and then both black wires together, and then to the other leg of the switch. I'm glad that I didn't try to jump the gun and put a load on it.

[cgo]

I forgot to also say that the 5 volts is probably going through a regulator IC like the lm7805 which will give you 5 volts 1 amp, the 48 volts is unregulated direct off the filter caps , which is ok for running either servo or stepper motors.

[cgo]

There should be something that shows phasing , it maybe red red , black black , use a fuse to test that, maybe 1 or 2 amps ( just enough to charge up the caps while testing it ). Usually its printed on the side of the transformer.

[Al_The_Man]

So I need to connect both red wires together, and run them to one leg of the AC switch that I installed in my enclosure, and then both black wires together, and then to the other leg of the switch.

Antek typically are RED & Black for each winding so you have it right for 120v.
The nice thing about Toroidal, they are easy to change a secondary by decreasing or increasing windings or adding a complete separate winding.
Al.

[jmc2010]

Ok! So I re-wired in parallel, and am now getting power across the DC outputs. If I check across positive and negative on the 48v side, I get about 106v +-3v. If I check across positive and "C", I get about 52v. So which terminals am I supposed to be using? I would think positive and negative, but the multimeter results have me confused. Also getting about 10v on the 12v side.

One more thing. Does this power supply need a ground?


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[Al_The_Man]

These power supplies are not usually regulated, they output straight from a bridge rect. so the 52v would be the 48v and the 10v would be for the 5v.
You need to run a earth ground wire to the chassis of the P.S.
Al.

[jmc2010]

So what is the voltage that I'm getting between the positive and negative that is over 100v? I only get 52v across the positive terminal, and one marked "c". The terminals on the 48v regulator are in this order:

+ + + C - - -




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[Al_The_Man]

Did you not get a hook up sheet with it? Can you post it or a ref to it?
Al.

[jmc2010]

No, that's the problem. There was no documentation with it, and I can't find any on their site. On the transformer is a sticker that details the voltage at the wires before the regulators, but nothing in the terminals.


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[Al_The_Man]

The secondary AC and the DC is usually kept separate outputs, you may have to reverse engineer it or trace the connection of the two Caps to the output terminals, and use a resistance meter to find common connections?
Did you try emailing Antek for a hook up sheet?
Al.

[jmc2010]

Yes, and I've called a few times, although it's been later in the day when I called. I'll send another email tonight, and call again in the am. Shouldn't have to guess at this.


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[jmc2010]

Here is an image of the regulator board:

Attachment 227962

[Al_The_Man]

Looks like only one rectifier?
What do you get between C and each + and C and each -?
Al.

[jmc2010]

There is a 48v regulator, and a 5v regulator. When I check voltage across + and C, I get 52v +/-3v. Same when I check across - and C, I get 53v +/-3v.


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[jmc2010]

When I check across + and - I get about 105v.

[Al_The_Man]

Where are the regulators? I don't see any? Just one power bridge rectifier.
(the minus to C test is cut off).
Al.

[jmc2010]

Where are the regulators? I don't see any? Just one power bridge rectifier.
(the minus to C test is cut off).
Al.

You're right. They are rectifiers. I'm still in the learning stages of electrical. The 5v rectifier isn't in the picture, but it has a + and a - terminal, and it checks at 10v.

[jmc2010]

full view: