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Post by jin167 on Jul 23, 2016 21:52:45 GMT -6
Attachment Deleted I'm thinking about replacing a cheap 24V DC SMPS with a 24V LPS for my w295b rack but the problem is the rack is using a 4 pin XLR connection as its power inlet and the output of a 24V DC SMPS has been changed accordingly to cope with it but when I had a quick look at the connections it seemed a little unusual as there were 4 wires coming out of the 24V DC SMPS (shouldn't there be 2?). I've included a picture of the 4 pin xlr for you to have a look. 2 white wires are connected to 4 and what looks like a -ve terminal (black wire) and ground(?) are connected to 1 of the 4 pin xlr. If I was to replace this 24DC SMPS with a 24V LPS that has a 2.1 mm * 5.5 mm output how should I wire them?
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Post by Deleted on Jul 24, 2016 3:19:31 GMT -6
OK, 4 pin connections cables are pretty usual for PSU duties for a simple reason, you can not take them accidentally for a balanced or unbalanced line or mic signal and make a wrong connection PSU to audio.
why they have 4 out cables in the psu you can only speculate about. Maybe it can be used for other duties or was originally designed for s.t. different but came cheap and handy for this task.
Sorry, i guess i don't understand the question at the end of your post, unfortunatly i am no native speaker, would you mind rephrase your question?
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Post by jin167 on Jul 24, 2016 3:35:03 GMT -6
OK, 4 pin connections cables are pretty usual for PSU duties for a simple reason, you can not take them accidentally for a balanced or unbalanced line or mic signal and make a wrong connection PSU to audio. why they have 4 out cables in the psu you can only speculate about. Maybe it can be used for other duties or was originally designed for s.t. different but came cheap and handy for this task. Sorry, i guess i don't understand the question at the end of your post, unfortunatly i am no native speaker, would you mind rephrase your question? Hi, smallbutfine. Sorry if my question wasn't clear. Hmm... my understanding is that for a typical 230V AC to 24V DC converter there are usually 2 cables coming out of the DC side (+ve and -ve) but for some reason when I opened up the connection there were 4 (two white lines connected to number 4 of the xlr and one black and braided wire connected to number 1 of the xlr). If I wanted to use a 230V to 24V DC LPS which only has 2 cables (+ve and -ve) coming out of the DC side how should I make the connections? The name of the model of a 24V DC SMPS that I'm currently is using is PSA18U 240. |
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Post by Deleted on Jul 24, 2016 3:40:48 GMT -6
Ah, sorry, got it now...
D'oh, my fault, should have taken a look at the photo...understand your confusion with the wiring. ;-)
So, the shield/ground should connect to 0V and the other pin is +24V i guess. The vintage german modules take the same voltages as the NEVE modules.
So, i assume the pin with the black litz and shield is 0V and the white ones is the pin for +24V.
If you want to be 100% sure, connect the old psu and measure the DC/resistance with a simple DMM. Black to Ground/case should measure R=0 Ohm.
Black to white +24V.
Hope it helps? Don't hesitate to ask if somethings unclear or the measurement shows something different....
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Post by Deleted on Jul 24, 2016 3:44:44 GMT -6
Of course, for your new linear supply you connect 2 wires, correct.
And shield to 0V.
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Post by jin167 on Jul 24, 2016 3:58:15 GMT -6
Of course, for your new linear supply you connect 2 wires, correct. And shield to 0V. Great! Thank you, smallbutfine. I just thought it was weird to find 2 white (+ve) cables connecting to one side. I'll try to measure the voltage between each cable and see if I can determine which cable connects to which pin. |
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