Hypex UCD2K not working, help

[Joseph R]

Hi to all,
I have a ucd2k and a smps3k from hypex but it doesnt work.
When I connect the them together and power up I can hear the amp's output relay switching every 0.5 second.
The smps alone works fine I got the correct voltages. So problem must come from the amp.
Tried to contact Hypex but no reply.
Can somebody help?
Thanks

[phase_accurate]

Hi Joseph

They probably don't respond due to two reasons: 1.) they might be very busy at the moment (hint: nCore) and 2.) this is an OEM module which isn't usually supplied to private persons. And if the latter happens it is usually through some "illegal" channel.

There is no relay on the ucd 2k IIRC (I once had one in my hands). Did you do all the connections right (including the enable input) ?

Regards

Charles

[Jan-Peter]

Originally Posted by Joseph R

Hi to all,
I have a ucd2k and a smps3k from hypex but it doesnt work.
When I connect the them together and power up I can hear the amp's output relay switching every 0.5 second.
The smps alone works fine I got the correct voltages. So problem must come from the amp.
Tried to contact Hypex but no reply.
Can somebody help?
Thanks

Joseph, this week we're closed for holidays. Next week support is back to help you....

[Joseph R]

To phase accurate : Thanks for advice to monitor enable pin. I did connect it with the flat cable to the smps so was thinking that the smps enable the amp.
About the relay your right I did mix it up. Must be on the smps.
Last test was done a month ago so tomorrow will dig in again and watch enable pin.

To Jan-Peter : I did send my mail on the 29th of November you where closed already? Will send mail again next week. All best wishes for 2012.


PS: I'm not a private this is a professional project and hoping to get better result as with other class d amps that are available as kits here on the forum.

[dudaindc]

Originally Posted by phase_accurate

...
2.) this is an OEM module which isn't usually supplied to private persons. And if the latter happens it is usually through some "illegal" channel.
...

Are you sure?
Last time I checked (today), one can buy these exactly two modules from the Hypex webstore for 695 Euros (plus shipping).

[phase_accurate]

It looks as if you were right !

regards

Charles

[Joseph R]

Here a scope of pin 4 (yellow) and 6 (blue) of connector J10 wich should be amp ready and amp ON/OFF. It should be because the datasheef is full of errors regarding pinouts!!! The connector pinning on page 3 doesnt match the rest of the datasheet. So what's right and what's wrong?
For such an expensive amp I was expecting a correct datasheet.

[deanoUK]

Amp on/off needs to be pulled low.

Do the power rails look OK ?

I know the UCD400's exhibit this behaviour if you over volt them.

[Joseph R]

Originally Posted by deanoUK

Amp on/off needs to be pulled low.

Do the power rails look OK ?

I know the UCD400's exhibit this behaviour if you over volt them.

How do i pull it low? straight to ground or with a resistor

[deanoUK]

I am not sure how these signals interact with the SMPS3K.
So maybee best to remove the signal cable first.

Just grounding the amp on/off pin will work.


Are you shure the yellow trace is amp on/off ?
Looks like pins may be reversed on scope trace ?

BUT, it sounds like your amp has an error condition.
They will continue to attempt re-starting like you describe if :-

Rail volts out of range.

DC on input.

Output short/grounded.