james.wilson Posted September 13, 2011 Share Posted September 13, 2011 assuming the psu is actually caperble of 1.5A then its fine. A lot of cheap gear push the spec to what it can do on a good day at -40 degrees etc etc. Not real world installs. It may just be caperble of 300mA. Also the psu needs (if linear) a decent sized smoothing capacitor. If this isnt large enough for the demand then the psu will not give a clean 12v DC. You shouldnt push up the voltage on the supply side if you have a voltage drop problem. YOu either need to site the psu closer to the camera to reduce the cable length, or use a adequate size cable. Voltage drops above 3% dont comply anyway. Easy way to test is to temp run the camera on a battery locally. If that clears the fault then ist psu. IF it doesnt its cable or camera. Assuming its not the monitor lol securitywarehouse Security Supplies from Security Warehouse Trade Members please contact us for your TSI vetted trade discount. Link to comment Share on other sites More sharing options...
primone Posted September 20, 2011 Share Posted September 20, 2011 12V 1.5amp is enough. I think it has nothing to do with the power supplies. Maybe the problem is the cable and the connector. Or maybe the camera's problem. It has an amplifier circuit in the Camera if the component has something wrong it can't transit the signal through such long cable. but once you use a short cable it will work fine again. Maybe your camera is not sony original camera. only the main component is from Sony. is that right? Link to comment Share on other sites More sharing options...
sjsturner Posted September 20, 2011 Share Posted September 20, 2011 As Mentioned by james i had similar probs and turned out to be mains interference all cams were on different phases and had some bad earths! when powered by battery at the psu end no problems soon as mains was turned on to psu wavy lines again.had to supress with filters in the end as they wouldent pay to sort out there electrical problems Link to comment Share on other sites More sharing options...
Rulland Posted September 21, 2011 Share Posted September 21, 2011 imo that isn't a 'site electrical problem',what can the customer do if they have a 3 phase supply,more likely interference caused by cctv wiring in to closer proximity to the mains stuff. Link to comment Share on other sites More sharing options...
PeterJames Posted September 21, 2011 Share Posted September 21, 2011 As Mentioned by james i had similar probs and turned out to be mains interference all cams were on different phases and had some bad earths! when powered by battery at the psu end no problems soon as mains was turned on to psu wavy lines again.had to supress with filters in the end as they wouldent pay to sort out there electrical problems Phases dont effect low voltages unless your using a cheap unregulated power supplies Link to comment Share on other sites More sharing options...
njinstallation Posted October 11, 2011 Share Posted October 11, 2011 hi try disconnecting 3 of the cameras and leave 1 on,i had similar fault with 674 dvr, channel 4 had fault on dvr , every time camera was in it made all others bad picture. www.ashdene-uk.com Link to comment Share on other sites More sharing options...
sjsturner Posted February 27, 2012 Share Posted February 27, 2012 imo that isn't a 'site electrical problem',what can the customer do if they have a 3 phase supply,more likely interference caused by cctv wiring in to closer proximity to the mains stuff. It was the customers problem as this was largely installed by their maintenence elecs and some local cctv company although most cabling appeared ok. Phases dont effect low voltages unless your using a cheap unregulated power supplies All psu were regulated fused channels.However Electrical installation of site was mostly done by 1st year apprentice who claimed to be fully qual electrician and its only just come out that he was fibbing as one of his cables melted and went bang! Link to comment Share on other sites More sharing options...
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