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Connex Electronics 2kW Power Supply
Connex Electronics 2kW Power Supply
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Old 7th October 2019, 04:07 PM   #1
Audio Mo is offline Audio Mo
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Default Connex Electronics 2kW Power Supply

Hi Folks

I'm building a multi channel amp 3 x TPA3255 amps expandable to 4 boards (6 to 8) channels. I got a 2kW SMPS from connex electronics and put 1 channel relay for the remote 12v trigger from ARV.

This is the relay https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Wired the EMI Filter to PS and relay as follows:

Live to PS Direct Wire Connection

Earth to PS Direct Wire Connection

Neutral > Relay > PS

The SMPS keeps powering up regardless so switched the relay to live wire, well same things happened. Should I have a two channel relay to isolate both Live and Neutral? Any recommendation on which relay to use?

There is also a pin header that is not described online in the attached picture, I now -A and +A are auxiliary power but what about the rest of pins. Is there a way I can put the PS in standby?

I tried email connex electronics several times but I did get any answer, maybe they are affected by the situation in HK.

Can someone help please? Thanks
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File Type: jpg PS Pin out.jpg (621.2 KB, 219 views)
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Old 7th October 2019, 04:12 PM   #2
kipman725 is offline kipman725  United Kingdom
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I would check your relay is actually switching it could have got welded shut by inrush current the first time you used it if under rated. Interrupting the live connection will tun off your power supply so something is wrong...
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Old 7th October 2019, 04:14 PM   #3
Eva is offline Eva  Spain
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Note that the relay has Common, Normally Open and Normally Closed connections.
Note that the relay could be stuck in one position after an accidental surge.
Check proper relay connection and relay operation with multimeter (do not apply mains until it checks OK with multimeter).
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Old 7th October 2019, 04:16 PM   #4
Audio Mo is offline Audio Mo
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Quote:
Originally Posted by kipman725 View Post
I would check your relay is actually switching it could have got welded shut by inrush current the first time you used it if under rated. Interrupting the live connection will tun off your power supply so something is wrong...
It's rated 10A 250volts, I thought of that but I can hear it clicking when 12v are on
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Old 7th October 2019, 04:18 PM   #5
Audio Mo is offline Audio Mo
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Quote:
Originally Posted by Eva View Post
Note that the relay has Common, Normally Open and Normally Closed connections.
Note that the relay could be stuck in one position after an accidental surge.
Check proper relay connection and relay operation with multimeter (do not apply mains until it checks OK with multimeter).
It was connected it wired

Live > com, NO to PS Live pin
OK I will

Thanks
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Old 7th October 2019, 04:21 PM   #6
Audio Mo is offline Audio Mo
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Can anyone recommend a good (tired and tested) relay please?
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Old 7th October 2019, 05:50 PM   #7
Eva is offline Eva  Spain
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Which is the element missing?
a) A multimeter.
b) The aim to do some measurements.
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Old 7th October 2019, 05:52 PM   #8
Audio Mo is offline Audio Mo
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Quote:
Originally Posted by Eva View Post
Which is the element missing?
a) A multimeter.
b) The aim to do some measurements.
A) I have a multi meter
B) No measuring equipment
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Old 8th October 2019, 07:52 PM   #9
indianajo is offline indianajo  United States
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A multimeter is measuring equipiment.
I fix amps with 1 DVM from Sears 2 Simpson 266 analog VOM with 20 vac & 2 vac scales.
A $20 5 kohm/v vom would test if a relay NO contact is welded closed. $30 for a DVM to farnell or RS would get you a DVM more sensitive.
I've fixed a couple of switching power supplies with this equipment too. Warning, unplug switcher supplies from AC source and discharge the main caps (rated 200v or 400v) at the front with a resistor and 600 v rated wire before poking around with a meter. Don't touch metal with both hands. don't wear jewelry on hands or neck. don't work alone, or distracted by conversation or entertainment.
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Last edited by indianajo; 8th October 2019 at 07:55 PM.
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Old 9th October 2019, 04:43 AM   #10
linuxfan is offline linuxfan  Australia
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At the risk of me sounding silly, can I ask you to go back a step, and provide some further information:
Quote:
Originally Posted by Audio Mo View Post
I got a 2kW SMPS from connex electronics
What model number? The current model SMPS2000RxE has a very different auxiliary output connector than the one in your photo -
http://connexelectronic.com/wp-conte...MPS2000RxE.pdf

Quote:
Originally Posted by Audio Mo View Post
and put 1 channel relay for the remote 12v trigger from ARV.
What's "ARV"? And from what device do you want to initiate the standby function of the Connex?
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