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Search: Posts Made By: vsmGuy
Forum: Troubleshooting Power Supplies and Power Supply Design 09-23-2012, 03:05 PM
Replies: 28
Views: 13,112
Posted By vsmGuy
Unhappy Re: Can I test or operate APC Smart UPS 2200 off a single RBC7

Unfortunately for me, the noise remains even after trying with new batteries.

I went to Walmart and got 4x12V car batteries. I don't know their AH rating, but it was just meant to check if new...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-22-2012, 02:02 AM
Replies: 28
Views: 13,112
Posted By vsmGuy
Re: Can I test or operate APC Smart UPS 2200 off a single RBC7

When you mentioned "2/5 of nominal capacity, but working normally" did you mean "2/5 of AH rating" but correct voltage?
Forum: Troubleshooting Power Supplies and Power Supply Design 09-22-2012, 01:20 AM
Replies: 28
Views: 13,112
Posted By vsmGuy
Re: Can I test or operate APC Smart UPS 2200 off a single RBC7

Don't get me started with the BackUPS - for some reason these seem to be the only kind APC now sells to consumer retail :bash:

Anyways, if the batteries are the problem, could you recommend...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-22-2012, 01:11 AM
Replies: 22
Views: 14,152
Posted By vsmGuy
Re: Need tips in fixing APC 1500VA UPS having buzzing noise

Attached is a clip of the sound that comes from the 22uF, 150V bipolar yellow capacitor when charging the batteries/online.

At 45s into the recording, I turn off the line power - notice how the...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-22-2012, 01:02 AM
Replies: 28
Views: 13,112
Posted By vsmGuy
Re: Can I test or operate APC Smart UPS 2200 off a single RBC7

Oh - got the polarities reversed. Thank you for this detail.

Awkward enough: I looked around a few hardware stores and no one seemed to have a screw on type standard AC male type plug - all were...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-22-2012, 12:58 AM
Replies: 28
Views: 13,112
Posted By vsmGuy
Re: Can I test or operate APC Smart UPS 2200 off a single RBC7

Attached is a clip of the sound that comes from the 22uF, 150V bipolar yellow capacitor(s) in both the models when charging the batteries.

At 45s into the recording, I turn off the line power -...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-21-2012, 11:34 AM
Replies: 28
Views: 13,112
Posted By vsmGuy
Re: Can I test or operate APC Smart UPS 2200 off a single RBC7

Exactly - hence my concerns in #13 (http://www.badcaps.net/forum/showpost.php?p=267811&postcount=13)

Anyways, as the UPS does not charge each battery individually I could perhaps buy those deep...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-21-2012, 09:25 AM
Replies: 28
Views: 13,112
Posted By vsmGuy
Re: Can I test or operate APC Smart UPS 2200 off a single RBC7

I got a closer look at it this morning on the way to work:

1. The batteries are hardwired in series by a thick yellow wire. The individual batteries measure 26.3V each off load.

2. site wiring...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-20-2012, 04:53 PM
Replies: 28
Views: 13,112
Posted By vsmGuy
Re: Can I test or operate APC Smart UPS 2200 off a single RBC7

Oh yes - the +BATT goes through the fuse to become +BATTF and then it goes to the transformer which has 24V and 12 taps.

Hmm, but could you answer the above question I had:

does it mean that...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-20-2012, 03:24 PM
Replies: 28
Views: 13,112
Posted By vsmGuy
Re: Can I test or operate APC Smart UPS 2200 off a single RBC7

Thank you Behemot: does it mean that the UPS sees the internal RBC11 as a single battery as well?

This would mean that it does not charge each battery individually and then I will have to be very...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-20-2012, 12:21 PM
Replies: 28
Views: 13,112
Posted By vsmGuy
Re: Can I test or operate APC Smart UPS 2200 off a single RBC7

I got to have a quick look at the unit on way to work, will look into it in details over the weekend.

Model number: SU2200XLNET...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-19-2012, 09:04 PM
Replies: 28
Views: 13,112
Posted By vsmGuy
Re: Can I test or operate APC Smart UPS 2200 off a single RBC7

I posted the schematic to the model: would you be able to show me where the two batteries are being added together to get 48V (because each individual battery is 24V) - I am interested.

The UPS...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-19-2012, 12:30 PM
Replies: 28
Views: 13,112
Posted By vsmGuy
Can I test or operate APC Smart UPS 2200 off a single RBC7

I have a noisy APC Smart UPS 1000 that has a single RBC7.

I have someone interested in selling me a APC Smart UPS 2200XL.

The 2200XL unit does not turn on, so it might be that the batteries...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-19-2012, 12:28 PM
Replies: 22
Views: 14,152
Posted By vsmGuy
Do APC UPS emit buzzing noise when their batteries are dying

Thanks Toasty for the reply.

I replaced both the caps around the area and the noise remains.

Since the noise comes when the batteries are charging or when I make them discharge - could it be...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-12-2012, 09:48 PM
Replies: 22
Views: 14,152
Posted By vsmGuy
Re: Need tips in fixing APC 1500VA UPS having buzzing noise

Toasty, I had hoped you were wrong and sunk ~$30 in parts to replace the caps (new, exact to original specs).

Noise remains - perhaps a bit louder than before :noob:



The noise is very well...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-04-2012, 12:12 PM
Replies: 22
Views: 14,152
Posted By vsmGuy
Re: Need tips in fixing APC 1500VA UPS having buzzing noise

Thank you Toasty for the advice -
The original cap that is making the noise (and the one I intend to replace) is SIEMENS EPCOS 20uF 150V Capacitor.

Given that, these seem to fit the bill just...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-03-2012, 09:38 PM
Replies: 22
Views: 14,152
Posted By vsmGuy
Re: Need tips in fixing APC 1500VA UPS having buzzing noise

I found caps of similar rating (20uF 250V) that are $3 each: http://www.bgmicro.com/24uf220vac.aspx

1. However, these are 12 years old (made in October 1998) - should it be good to go or it's too...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-29-2012, 01:52 PM
Replies: 22
Views: 14,152
Posted By vsmGuy
Re: Need tips in fixing APC 1500VA UPS having buzzing noise

Things like this make me say "ignorance is a bliss". All the while I had been buying surge protectors and I have only one power tap I got at Walmart. Now I either need to remove the protection PCBs...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-29-2012, 10:50 AM
Replies: 22
Views: 14,152
Posted By vsmGuy
Re: Need tips in fixing APC 1500VA UPS having buzzing noise

Toasty, quite an insightful post :rock:



Yes, I posted the source link to this here: http://www.badcaps.net/forum/showpost.php?p=254875&postcount=5



The caps are light brown, and hence, a...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-29-2012, 01:12 AM
Replies: 22
Views: 14,152
Posted By vsmGuy
Re: Need tips in fixing APC 1500VA UPS having buzzing noise

I know - that's because EPCOS makes them no more. See the model number on the picture I attached. Even if they did, their MOQ is 4k pieces.



In all probability, the capacitors I am going to buy...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-28-2012, 08:26 PM
Replies: 22
Views: 14,152
Posted By vsmGuy
Re: Need tips in fixing APC 1500VA UPS having buzzing noise

budm, according to my newbie knowledge, these UPS are designed such that it reuses the big input transformer for output too via cleverly designed relay network.

This is the datasheet of the cap:...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-28-2012, 08:07 PM
Replies: 22
Views: 14,152
Posted By vsmGuy
Re: Need tips in fixing APC 1500VA UPS having buzzing noise

UPS is a true sine wave inverter; model number being SUA1000VA. I never use step sine wave types :-)

The noise seems to be from the EPCOS cap, but also could be from the chicklet brown cap to its...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-28-2012, 08:03 PM
Replies: 16
Views: 6,714
Posted By vsmGuy
Re: Smart-UPS MOV replacement

I apologize for bringing this thread back from the dead but the circuit board shown by Toasty looks like my own APC UPS.

I am looking to replace the yellow cap to the right of the picture:...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-28-2012, 07:28 PM
Replies: 22
Views: 14,152
Posted By vsmGuy
Need tips in fixing APC 1500VA UPS having buzzing noise

I have a year 2005, APC UPS and one of the caps - an SIEMENS EPCOS 20uF 150V Capacitor - started making a buzzing noise.

This seems to be a AC, non-polarized capacitor and most local stores have...
Forum: General Electronics Technical Discussion 01-09-2008, 05:36 AM
Replies: 5
Views: 3,039
Posted By vsmGuy
Thumbs up Re: Mixing logic families

Very nicely answered !

The ATMEL 89 series and PIC seem to have TTL compatible IO. Hence, LS should not be a problem.

I was sorry I did not mention this, because I had a mind block with the...
Showing results 1 to 25 of 26

 
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