Delta DPS-200PB-185A Schematic

[NAVY ET1]

Re: Delta DPS-200PB-185A Schematic

These P.S.'s are out of an Interlogix Tru Vision NVR. I just received a new Hikvision NVR by UPS and the P.S. is identical. I opened it up to put the old Hard Drive in and checked the voltage across C801 an it reads 400vdc. They call it an LTS Switching P.S. The voltages out of the new one are 12vdc and 52.6vdc. Thats all the new info I have. LYLE

[sam_sam_sam]

Re: Delta DPS-200PB-185A Schematic

Here is the description of a ring tester

https://www.youtube.com/watch?v=CFyRO42JMbE

I hope this helps you


PFC

http://power-topics.blogspot.com/200...i-need-it.html


When I Googled PWA

I came up with a medical type of switching power supply am I correct about this

[NAVY ET1]

Re: Delta DPS-200PB-185A Schematic

This is supposed to be a replacement P.S. from Amazon. I took a peek inside and everything is different. It looks to be lighter weight. The 12vdc output plug is different and the output power ratings are much less. The case looks exactly the same. As for your last comments: It has been awhile since the Navy Schools - please enplane what PFC, PWA, Optic sensor & ring xfmr. are referring to. They have added a lot of new terminology and types of parts in the last years. Thanks for any help. LYLE

[PeteS in CA]

Re: Delta DPS-200PB-185A Schematic

That PSU is about 3 1/2 years old, so I doubt it has worn out low value electrolytics. It's a fairly modern model (the 52V output is the clue), so I doubt you'd get a schematic from Delta.

The layout puzzles me, but it looks like it has active PFC. If so, the 163V at C801 means the PFC circuit is not working, and the outputs are being kept disabled. It looks like it might have two inverters, one for each output.

The one whose transformer is next to the daughter card looks to be a flyback design, in which the "transformer" is actually a coupled inductor (hence, no separate output inductor). If I'm correct that probably is for the 5V output.

The other inverter seems to use the transformer near C801, with an output inductor near the corner of the PWA. If I'm correct this probably is for the 52V output, and is probably a forward converter.

[sam_sam_sam]

Re: Delta DPS-200PB-185A Schematic

Do you have a ring transformer tester it might be time to use it on this transformer but before this can you replace change the optic sensor ( to a known working one ) for the 52 volt side of the power supply and see if dose something different than what it is doing now

[NAVY ET1]

Re: Delta DPS-200PB-185A Schematic

The fuses are good. I have 163vdc out of the first part of the P.S. across the CAP. C801. the power res. R355 & R505 (.56 Ohm.) do not look real good, they have some marks in the coating on them. The 12 VDC outputs measure 11.5v on one and 10.5v on the other. The 52vdc (POE Power) is dead. I can see volt. on the primary of the trans. It measures the same on all thermals like there is an open in the ckt. No volt on the secondary. The files show how far I have got with trying to figure out the schematic. The board is very tight to see everything. Thanks for any help. LYLE

[sam_sam_sam]

Re: Delta DPS-200PB-185A Schematic

First of all are the low value capacitors below 100uf name brand capacitors if not replace them first then see if any of them work after that

I would highly recommend that you put an incandescent light in place of the fuse when checking this one if the fuse is blown

From what you said about one of them that dead what is the voltage across the main filtering capacitor be careful when checking the voltage because this will be high voltage also check the fuse if you have no voltage across the main filtering capacitor

If you only have 160 some volt then look for the switching power supply regulator ic chip and post the part number for it

[NAVY ET1]

Re: Delta DPS-200PB-185A Schematic

I am having a problem with a similar power supply. You asked for some pictures and I have some. I have three of these on my workbench right now. None of them appear to have bad caps but the outputs are low or missing altogether.

[sam_sam_sam]

Re: Delta DPS-200PB-185A Schematic

Please post some pictures of this board that you are working on

[BruceGilbert]

This power supply is dead is there any common failures on these power supplies that would help me get started. Without a schematic I am really fumbling around.
I do know that it is supposed to have two outputs and I don't have either. The power supply doesn't have that "expensive electrical" smell and I am not able to see anything obvious that is wrong. Any help or suggestions would be appreciated.

Thankyou
Bruce