Re: [Dorset] [OT] 12v Power supply replacement
On 07/03/2021 07:59, Terry Coles wrote: On Saturday, 6 March 2021 23:17:06 GMT Tim wrote: Its two lights and two power supplys (of which one power supply is dead), both light work already tested with working power supply. Have looked at the dead power supply (you can take it apart) but nothing looks out of place. Tim, I know nothing about fish tank lighting (the last time I kept fish was 30-40 years ago and I believe it had a fluorescent light). However, I do know a bit about electrics and electrical design. You can buy specialist power supplies for LEDs from places such as LED Hut https://ledhut.co.uk/search?type=product=+LED+Transformer but they tend to be expensive. We used a 60 W item from them back in 2016 for the model railway lighting (and it was half the price but wasn't dimmable). A quick search for LED Transformer on Google yielded lots of hits with prices much lower including: https://www.seratechnologies.com/shop/led-transformer-12v/ The LED lights are just over 4ft long with three rows of LED's (it is a 5ft fish tank) so I guess 47 watt was the design wattage. There is a long lead from the light about 5ft and then a small pig tail from the power supply which then screw together with a male female round three pin plug\socket. There is a small pig tail of about 15" inches which is hard wired to the Power supply for the 240v mains. I think that the three-pin plug may be a cheap and cheerful way of ensuring that the power can't be plugged in the wrong way round, but it's possible that the supply that you have monitors current draw and that is the sense wire. (It's also possible that the cable dates back to the time when the company's products were all powered directly from the mains (eg fluorescent or mains striplight) and they had to include earth.) If you have a multimeter, I would suggest buzzing all three pins out to see where they go (try both ends, eg lights to plug and plug to supply, to try to ascertain what the third pin is connected to. Apart from that, does the broken PSU (or light) have a brand name or Model Number? A search for that might provide a bit more information. Hi Terry Thanks for the two web site, I will bear them in mind, the only name on the Power supply is the light manufacturer and model number for the light. I have checked the mainboard in the power supply and can not find an name of the main board. I was though able to confirm that there are three cable in the output cable, a blue, brown and a black, I did note that the black cable was around half the size of the blue and brown cable. As you say I will have to use my multi meter on the pins on the working power supply to work out what is what. Unfortunately this project is going to have to go on the back burner for a couple of week or so as I have new furniture arriving at the end of the week which will involve me clearing existing furniture of items in readiness and then rehoming into said new furniture which will take up me a little while to sort out. Thanks for the help Tim H -- Next meeting: Online, Jitsi, Tuesday, 2021-04-06 20:00 Check to whom you are replying Meetings, mailing list, IRC, ... http://dorset.lug.org.uk New thread, don't hijack: mailto:dorset@mailman.lug.org.uk
Re: [Dorset] [OT] 12v Power supply replacement
On Saturday, 6 March 2021 23:17:06 GMT Tim wrote: > Its two lights and two power supplys (of which one power supply is > dead), both light work already tested with working power supply. Have > looked at the dead power supply (you can take it apart) but nothing > looks out of place. Tim, I know nothing about fish tank lighting (the last time I kept fish was 30-40 years ago and I believe it had a fluorescent light). However, I do know a bit about electrics and electrical design. You can buy specialist power supplies for LEDs from places such as LED Hut https://ledhut.co.uk/search?type=product=+LED+Transformer but they tend to be expensive. We used a 60 W item from them back in 2016 for the model railway lighting (and it was half the price but wasn't dimmable). A quick search for LED Transformer on Google yielded lots of hits with prices much lower including: https://www.seratechnologies.com/shop/led-transformer-12v/ > The LED lights are just over 4ft long with three rows of LED's (it is a > 5ft fish tank) so I guess 47 watt was the design wattage. There is a > long lead from the light about 5ft and then a small pig tail from the > power supply which then screw together with a male female round three > pin plug\socket. There is a small pig tail of about 15" inches which is > hard wired to the Power supply for the 240v mains. I think that the three-pin plug may be a cheap and cheerful way of ensuring that the power can't be plugged in the wrong way round, but it's possible that the supply that you have monitors current draw and that is the sense wire. (It's also possible that the cable dates back to the time when the company's products were all powered directly from the mains (eg fluorescent or mains striplight) and they had to include earth.) If you have a multimeter, I would suggest buzzing all three pins out to see where they go (try both ends, eg lights to plug and plug to supply, to try to ascertain what the third pin is connected to. Apart from that, does the broken PSU (or light) have a brand name or Model Number? A search for that might provide a bit more information. -- Terry Coles -- Next meeting: Online, Jitsi, Tuesday, 2021-04-06 20:00 Check to whom you are replying Meetings, mailing list, IRC, ... http://dorset.lug.org.uk New thread, don't hijack: mailto:dorset@mailman.lug.org.uk
Re: [Dorset] [OT] 12v Power supply replacement
On 06/03/2021 20:16, PeterMerchant wrote: On 06/03/2021 19:25, Tim wrote: My apologies as this is very much not linux and not even computer based. Just trying to tap in to the collective electrical knowledge of the group. I have 2 LED light on my Fish tank and one of the power supplies is dead. Getting a replacement power supply from the supplier is not an option, no longer available. The only technical detail I can tell you about the power supply is that it is DC 12v 47watt output, there are two switches on the Power supply which operate two modes on the light. I normally leave both switches on so the light in full on mode and is permanently switched on and is controlled via a time switch (one for each light), so having the two switches in not that important (to my thinking below). The output plug is a small round three pin affair which makes me think that there are two live cable and one neutral cable. On the assumption that this is correct, would getting a replacement power supply like a DC 12v 60w then cutting the supplied output plug off (which in most case is the two cable round push in plug.), then having cut the old output lead off the old power supply, solder the two lives to the single live on the new power supply and then the neutral to neutral. Would this work? I realise there is a bit of investigation to do first but just trying to think of possible options in getting a replacement (I have tried ebay). Any thoughts Tim Just my thoughts: It sounds like a lot of power for LED lights. It is one power supply driving two lights/bulbs. Can you swap the bulbs round to check that it is not the light that has gone? Assuming that you can open it up (Unplugged of course) can you check that there is not a fault in one wire, or in the switch? Of course, as it is for use near water it could be a potted power supply and inaccessible inside. I found this at 'lightinthebox.com It might be a cheaper overall option? Aquarium Light LED Light Fish Tank Light White With Switch(es) Plastic 3 W 220 V Peter M. Hi Pete Its two lights and two power supplys (of which one power supply is dead), both light work already tested with working power supply. Have looked at the dead power supply (you can take it apart) but nothing looks out of place. The LED lights are just over 4ft long with three rows of LED's (it is a 5ft fish tank) so I guess 47 watt was the design wattage. There is a long lead from the light about 5ft and then a small pig tail from the power supply which then screw together with a male female round three pin plug\socket. There is a small pig tail of about 15" inches which is hard wired to the Power supply for the 240v mains. Tim H -- Next meeting: Online, Jitsi, Tuesday, 2021-04-06 20:00 Check to whom you are replying Meetings, mailing list, IRC, ... http://dorset.lug.org.uk New thread, don't hijack: mailto:dorset@mailman.lug.org.uk
Re: [Dorset] [OT] 12v Power supply replacement
On 06/03/2021 19:25, Tim wrote: My apologies as this is very much not linux and not even computer based. Just trying to tap in to the collective electrical knowledge of the group. I have 2 LED light on my Fish tank and one of the power supplies is dead. Getting a replacement power supply from the supplier is not an option, no longer available. The only technical detail I can tell you about the power supply is that it is DC 12v 47watt output, there are two switches on the Power supply which operate two modes on the light. I normally leave both switches on so the light in full on mode and is permanently switched on and is controlled via a time switch (one for each light), so having the two switches in not that important (to my thinking below). The output plug is a small round three pin affair which makes me think that there are two live cable and one neutral cable. On the assumption that this is correct, would getting a replacement power supply like a DC 12v 60w then cutting the supplied output plug off (which in most case is the two cable round push in plug.), then having cut the old output lead off the old power supply, solder the two lives to the single live on the new power supply and then the neutral to neutral. Would this work? I realise there is a bit of investigation to do first but just trying to think of possible options in getting a replacement (I have tried ebay). Any thoughts Tim Just my thoughts: It sounds like a lot of power for LED lights. It is one power supply driving two lights/bulbs. Can you swap the bulbs round to check that it is not the light that has gone? Assuming that you can open it up (Unplugged of course) can you check that there is not a fault in one wire, or in the switch? Of course, as it is for use near water it could be a potted power supply and inaccessible inside. I found this at 'lightinthebox.com It might be a cheaper overall option? Aquarium Light LED Light Fish Tank Light White With Switch(es) Plastic 3 W 220 V Peter M. -- Next meeting: Online, Jitsi, Tuesday, 2021-04-06 20:00 Check to whom you are replying Meetings, mailing list, IRC, ... http://dorset.lug.org.uk New thread, don't hijack: mailto:dorset@mailman.lug.org.uk
[Dorset] [OT] 12v Power supply replacement
My apologies as this is very much not linux and not even computer based. Just trying to tap in to the collective electrical knowledge of the group. I have 2 LED light on my Fish tank and one of the power supplies is dead. Getting a replacement power supply from the supplier is not an option, no longer available. The only technical detail I can tell you about the power supply is that it is DC 12v 47watt output, there are two switches on the Power supply which operate two modes on the light. I normally leave both switches on so the light in full on mode and is permanently switched on and is controlled via a time switch (one for each light), so having the two switches in not that important (to my thinking below). The output plug is a small round three pin affair which makes me think that there are two live cable and one neutral cable. On the assumption that this is correct, would getting a replacement power supply like a DC 12v 60w then cutting the supplied output plug off (which in most case is the two cable round push in plug.), then having cut the old output lead off the old power supply, solder the two lives to the single live on the new power supply and then the neutral to neutral. Would this work? I realise there is a bit of investigation to do first but just trying to think of possible options in getting a replacement (I have tried ebay). Any thoughts Tim H -- Next meeting: Online, Jitsi, Tuesday, 2021-04-06 20:00 Check to whom you are replying Meetings, mailing list, IRC, ... http://dorset.lug.org.uk New thread, don't hijack: mailto:dorset@mailman.lug.org.uk
