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Old 26th October 2009, 10:55 PM   #1
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Default problem with hypes ucd400 and Smps400

Anyone tried a hypex UCD400 amp with a hypex SMPS400 power supply? The supplty alone outputs the right voltage but when I hook up the UCD400, the supply jumps to only 12V, then resets back to zero after 75ms. This cycles every 1.75 seconds.

I've only hooked up the +70V, GND, and -70V.

I've emailed customer service there but thoght if it's something simple I've done, I could get a quicker answer here. What am I missing?

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Old 26th October 2009, 11:59 PM   #2
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Never mind! I found my problem and am way to embarrassed to admit what I did!
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Old 11th January 2010, 03:09 PM   #3
Session is offline Session  Norway
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Well, that is not very educational. Could you please explain were you went wrong? I am waiting on one of there puppies myself.
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Old 11th January 2010, 04:15 PM   #4
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I'm embarrassed damn it!

OK, I'll fess up and blame it on old age.

I hooked up the power to LS+ and LS- and hooked up the speaker to + and -.

The really embarrasing part is I am a retired electrical engineer with half a dozen patents!

Just to be perfectly clear LS stands for Loud Speaker, not power!

There, happy?

P.S. After I corrected the wiring, it all worked fine with no apparent harm to either the speaker or the amp or the power supply.

Last edited by Phil Olson; 11th January 2010 at 04:16 PM. Reason: Additional info.
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Old 11th January 2010, 07:06 PM   #5
Session is offline Session  Norway
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Everyone can have a bad day right?

Anyways, glad it worked out allright for you.
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Old 12th January 2010, 06:25 AM   #6
Tarzan is offline Tarzan  Belgium
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Hey Phil,
It can happen but now we are sure of the rugidness of the Hypex modules.
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Old 12th January 2010, 07:08 AM   #7
Ltralus is offline Ltralus  Denmark
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We knew that already. What was tested here I think was the SMPS's overcurrent protection, looks like it worked. The module would have completely fried without it, or blown the rail fuses that probably wouldn't have been installed, or likely fried them both along with the module had they been.
James J.
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