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Old 9th April 2008, 10:32 PM   #1
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Unhappy Ucd180 Help needed!

Hello everyone. I need some advice or help. I have two ucd180 modules connected to a ucd-supply-st. The amps work fine i think but they like to turn off when they please and the blue leds go out. They wont turn on at all now.. Has anyone got any ideas? Thankyou..
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Old 10th April 2008, 01:50 AM   #2
RX5 is offline RX5  Philippines
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what is your load ?? any adttl heatsinks??

post in more info about your setup...
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RoCk On!!! I love my diy UcD!!
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Old 10th April 2008, 09:28 AM   #3
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Thanks for the reply. Do you mean the speaker load? The transformer is runing at 42 volts. The amps are attached to the bottom of a case that i made. I have not pushed the amp and they both did the same thing turning off and on but now they dont turn on at all. I have checked all my connections via the diagrams twice before hookup..
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Old 10th April 2008, 10:09 AM   #4
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I also put a power led on the power supply unit and it is on.. Im very confused at this. It will not turn on at all now..
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Old 10th April 2008, 11:14 AM   #5
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Quote:
Originally posted by -(daz84)-
I also put a power led on the power supply unit and it is on.. Im very confused at this. It will not turn on at all now..
Hi, 42V AC gives you 59VDC, this is to high. The overvoltage protection starts to work.

Read the datasheet/manual......

Jan-Peter
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Old 10th April 2008, 11:24 AM   #6
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Thank you so much for the input! Do you think i have damaged them at all?
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Old 10th April 2008, 11:27 AM   #7
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No, I don't think so. Try it with a 30VAC tranformer.....

Jan-Peter
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Old 10th April 2008, 02:21 PM   #8
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Thanks for the help. I feel dumb now...I suppose you live and learn lol. I am ordering the correct transformer so I hope the ucds are ok.
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Old 10th April 2008, 08:59 PM   #9
WJMIII is offline WJMIII  United States
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additional UcD180ST question

I am a super noob in electronics, and didn't find my answers in a faq or in my searching last night. I am assuming that most people are more advanced so my inquiry is bone-head noob! I am not a complete novice, just a UcD novice.

so if I have a nice 120VAC/42V transformer, that 42V feed into the power supply will be too much - I didn't get that from the data sheet - well, that is good to know

so I couldnt go 120>trans/42V>UcD180ST

and I couldn't go 120/trans/42v>UcD STpower supply> 180ST

but more like 120V>transformer>30V>Ucd ST power supply>180St
is that correct?

I thought I saw the max input for the PS was 42V, and I thought my transformer 42V output would work -
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Old 11th April 2008, 12:02 AM   #10
glt is offline glt  United States
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Transformers convert AC to AC, Power Supplies convert AC to DC, the UCD works on DC, so you can't connect a transformer directly to the UCD

DC voltage = 1.41*AC voltage, so 42 volts AC = 59V
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