Jump to content

naiefelyemeni

Members
 View Profile  See their activity

  • Content Count

    56

  • Joined

  • Last visited

Posts posted by naiefelyemeni

  1. Posted

    hi guys ok ive reset my pass on numurous hik vision dvr/nvrs but on this one it just wont accept the correct passcode nor the pass reset recovery code that you get from ip talk forums reset tool , it just always says inccorect code ? ive made sure 100 times i got the Long serial number correct and date , but just wont take it?? 🤷🤷🤷  

    is there another way or a board jumper reset method ? 

    20220714_174315.jpg

  5. Posted

    is 568 standard neccesary?? as long as the ends match up is it ok?? i read that thats not the case that the greeens split up they go around the center blue pair? what does that accomplish ? i thought as long as the ends match im good ? i have a feeling this is where i messed uo lol

    YES!!!!!! you cannot just match up ends!!! They are twisted SPECIFICALLY to prevent interference. That is why its not working. You need to stop "installing" systems until you learn to do it properly. Im sure there are many other mistakes you are making. I sure hope this system is not critical.

     

    its my first ip system didnt know it was neccaasary.. thanks i will change the order to 568B standard..

  8. Posted

    hi guys i installed 12 4mp ip cameras that have a draw of about 400ma through a 48v 16ch built in poe nvr

    GW ( Great wall ) brand .. 10 worked fine , 4 of them on 200ft lines working fine.. its the farthest 2 im gaving issues with.. IRs light up but NVR not picking.them up..

    i tried a 200ft line and coupler followed by a 50ft line so total 250ft each.. for Both cameras..No go.. i tried diff couplers and same thing.. i tried making my own cables using solid copper 5e 24awg and still no good ?? i tested out the cables out by plugging them to a router than to my laptop i got internet? i know best would be to use a cable tester but im pretty sure there good.. u guys think 250ft is just to far ? GW customer support told me up to 300ft shouldnt be an issue? u think if i change to cat6 will make.a.diff? 1 Awg will make the diff?

  9. Posted

    Which is why I asked for a link to your baluns ..... There are God and bad baluns and ....... Baluns that are sold as baluns but are not

     

    How have you run the power ?

     

    How have you split video and power

     

    It can be a long guessing game if you don't want to answer questions

     

     

    i ran 32 cat5e a pair for video and a pair for pos power and 2 pairs for neg power.. they all come into the room together.. then i split into 16 to one dvr and 16 to another dvr , and all power is split into many different power supplies, because if i put all power into 2 supply boxes then all videos will have bad picture.. so they are about 10 different power supplies to keep the pictures clean.. but i didnt have enough power supplies so there are like 6 cameras that are still not clear.. but i just wanted to use 2 16ch ps boxes not 15 different power supplies 3 boxes, 3 4 way splitters and 4 single wall warts.. kind of waste of money and to messy to many wires/cables.. And here is a pic of the baluns i used they say HD/ cvi/ tvi .?

    s-l1600.thumb.jpg.9ef3eae87350e32857f20db1128afcb8.jpg

  10. Posted

    Can you post a pic of your baluns

     

     

    i dont think its the baluns, because half of the system works fine.

     

     

    Well we don't know what type you used or if they are baluns

     

    100% not balun issue because if i give the prone cameras a seperate power supply picture is clear.. its probably ground issue, ill try grounding the dvr to the power supplies and hopefully that fixes the issue because i dont want to use 15 different power supplies for this install lol to much money just down the drain..

  12. Posted

    if i take off positive and leave negative on almost all of them the cameras still stay on..

    This is getting confusing. I'm telling you to make sure the only negative that supplies the cameras is that from the power supply that feeds them. I'm trying to make sure you are not accidentally interconnecting negatives, earths and grounds that shouldn't be.

     

    That statement sounds the wrong way round to me and if you'd have said you removed the negative and the cameras still worked then I'd say that probably proves a ground loop via the DVR earth. In other words the shield/screen out of the DVR is interconnected with your camera power supplies somewhere. I have no idea how they would be getting a positive voltage. Are the power supplies DC out or AC?

     

    I think you need to have an understanding of what is happening in your system. Do you have any previous experience with electronics or basic electrical principles?

     

     

    i have installed about 20 stores already using coax , this is the first install using cat5e and baluns.. and i have this crazy issue. what i meant is if i remove the positive, the camera still stays on lol.. meaybe its beacuse there cheap like tom said.. ANd i dont think its voltage drop because i hook up the cameras that have issues , about 15 , seperately and they work fine,, i even conneected a far run abiut 175ft using only a 500mah adapter and its picture was perfect, even at night.. so i can rule out voltage drop, its probably interference i guess? i never had this issue ever before.. ill never use cat5e again, well at least not the cheap CCA kind lol ..

  13. Posted

    i did try one by one, but there are so many cameras that cause issues with other cameras.. Now i have like 9 cameras separate box , 6 cameras seperate box , 3 cameras separate box , 3 cameras seperate adapter and 2 and 2 seprate adapters and 1 on a adapter on its own... if i mix any of these with any of the others they'll mess up each other.. so i gave up and just bought separate power supplies 2A for only $3 and just ill hook half of them up to individual adapters.. and be done lol .. driving me nuts..

    So you think its a power supply problem? Is that because when others were powered down, your problem cameras looked better? Did you even check volt drop? Have you tested a 'bad' camera separately as Boogieman suggested? Did you swap out baluns on a 'bad' camera?

     

    I hope your idea helps you but it sounds crazy to me to just swap out PSUs with no evidence of the problem in the first place.

     

    I'll ask one other question just out of curiosity: How do all your cables run out of the DVR room and to where they start to split off? Are they on a cable tray, or tacked next to each other on the wall, or are they bundled up and tied together?

     

    If your new PSUs don't fix it, you will have to look at interference - as has been suggested, cheap CCA, with cheap baluns could cause problems amongst a bundle of cables running very close together.

     

    And if you really think it's down to a ground loop problem, make sure only the cameras have a negative from the PSU, don't attempt to interconnect any other earths, grounds unless it is specifically required. Most ground loop problems are solved by isolation. I'm only saying this because you said some of your boxes were grounded, and I'm not sure what you meant by that.

     

     

    They are all running into the room together and tied together then split in hlaf 16 to one dvr and 16 to the other.. if i take off positive and leave negative on almost all of them the cameras still stay on.. i havent went back to the job site and will try grouding the dvr to the psu box..

  14. Posted

    But the power supply boxes don't have a ground on the

    Plug end? Do I still ground to the metal box and try?

    Did you do the basics, as discussed - isolating and working on only one camera at a time?

     

    When you're confused by something, the worst thing to do is jump from one thing to another without method. It very rarely solves the problem.[/q

     

    i did try one by one, but there are so many cameras that cause issues with other cameras.. Now i have like 9 cameras separate box , 6 cameras seperate box , 3 cameras separate box , 3 cameras seperate adapter and 2 and 2 seprate adapters and 1 on a adapter on its own... if i mix any of these with any of the others they'll mess up each other.. so i gave up and just bought separate power supplies 2A for only $3 and just ill hook half of them up to individual adapters.. and be done lol .. driving me nuts..

  15. Posted

    The images are all over the place due to ground balance, the simple way to fix this is to ground the DVR to the power supply feeding the camera's.

     

    There is an Earth point on the rear of the nvr just connect that to -over

    And all will be clear.

     

    Next time use IP equipment, or rj45 passive splitters to keep things tidy, no one likes a messy install.

     

     

    But the power supply boxes don't have a ground on the

    Plug end? Do I still ground to the metal box and try?

  16. Posted

    Yes but those cameras draw at most 1 amp.. So what do you think? It's probably voltage drop

    Since its only on the farthest cameras.? And you think adding one more wire for the positive will

    Make the difference? On the calculator it said it would go up 1 volt , that's good enough?

     

     

    Voltage is not your problem it's your amps

     

    Your camera might only be 1amp ..... But you will need 2 to 3 amp for that distance ..... And also take into account IR

     

    I would re-think that statement Tom. The current does not change throughout a series circuit. The current that flows at one end is the same as what flows at the other end. The flow of this current through a resistive line causes a voltage difference from one end to the other - the greater the flowing current then the greater the voltage differential. This is what the OP is having trouble with.

    Its probably no use to you now but normal practice for longer runs is to go with 24Vac power & cameras (no earth loop issues either)

     

     

     

    Ok it seems to be a ground loop or

    Interference that's messing up all these cameras.. I'm using now 12 different power sources boxes , wall warts mix and all cameras are clear now??

    I didn't want to go through 32 wires to see which ones has the interference.. But it looks so messy now.. : ( but customer is happy now or at least that's what I

    Think lol

  17. Posted

    Yes but those cameras draw at most 1 amp.. So what do you think? It's probably voltage drop

    Since its only on the farthest cameras.? And you think adding one more wire for the positive will

    Make the difference? On the calculator it said it would go up 1 volt , that's good enough?

     

     

    Voltage is not your problem it's your amps

     

    Your camera might only be 1amp ..... But you will need 2 to 3 amp for that distance ..... And also take into account IR

     

     

    I'm confused, the Voltage calculator says The higher the Amp Load the bigger the voltage drop??

    I'm very confused here..

  18. Posted

    Yes, if I felt I needed more than two cores for power, then I would share the other pair across the -/+

     

    I would just take it a step at a time.

     

    Voltage at problem cameras OK?

    No - Volt drop due to distance/poor cable/bad terminations?

    No - Supply not large enough for amount of cameras?

     

    Baluns, at both ends of bad cameras swapped for 'good' ones?

    Termination checked? (it is common practice to score cores of cable when stripping them)

     

    Could be interference?

    -> disconnect as much as possible while testing

    -> ground other cores, disconnect other baluns while testing

     

    In other words, make it as basic as you can and go through it methodically, which is why I suggest just seeing what a single camera, being powered, and providing a signal through a single pair of baluns looks like. Also, are your problem cameras the furthest away, and have you looked for a source of interference near those particular cameras?

     

    The whole DC ground, real (earth) ground issues can be tricky, but thankfully I've not had to overcome them yet.

     

     

    Thanks will go today or

    Tomorrow to job site and test voltage at ends.. I'm pretty sure it's a voltage drop according to the Voltage drop calculator.. Will respond with the results ASAP ..

  21. Posted

    Hi for that run your going to need 3 twisted pair for pos and neg.

     

    Then your 30amp power supply ..... How many output does it have ?

     

    Yeah I'm hitting my head for not

    Doing

    That now I gotta go to half the cameras and change up the wires..

    It's a 30amp 18 port.. I'm only using 11 ports.. I've done most of my previous installs using 10amp -20 amp boxes using all ports no problem? But never this long.. Maybe 120feet this install pushing 170-185..and using cat5 for first time..

    image.thumb.jpg.4fc48afefea473dc06c3f130dfc68107.jpg

    image.thumb.jpg.278d8865aeb9f5a7e4241e6e929cc259.jpg

  22. Posted

    Not neccesarily. The biggest mistake people make is they think a 5 amp supply "pushes" out 5 amps. The current a power supply delivers is determined by the load applied ( ie the camera ) Cameras are all different and require different currents for optimal performance. So for two different cameras a power supply may deliver 1 amp for camera A and 2 amps for camera B. It is the current through a conductor that determines the voltage drop. So if camera A is powered by 100m of cable having a resistance of 0.01 ohm / m (total loop resistance of 2 ohms) and is supplied by a 12V power supply then the voltage drop from power supply to camera would be current (1A) times resistance ( 2ohm ) for a total drop of 2Volts. Now if camera A was replaced with camera B it would be 2amp times 2 volt resulting in a 4 volt drop. It doesn't matter if the power supply is a 5 amp supply or a 500 amp supply as long as it can deliver what is required.

     

     

    i see.. so how am i going to figure out what i need. this is driving me nuts.. is 3 185 foot runs and the rest are shorter runs. using 1 twisted pair for pos power and 2 pairs for negative using a 30amp box only 11 ports used.. how come the far cameras are suffering? i thought 185ft is nothing? and 30 amps is enough?

  24. Posted

    Hi. Do you have that camera behind glass is the first question

     

     

    no just the camera.. and i gave all them enough amperage but still getting the effects of low power. i need to test out the ends of those long runs to see but i assumed 200ft or less is short runs and should have any issues..

     

    What are the effects of low power as you see it?

     

    as soon as the irs kicked in the 6-10 cameras went ****ty.. even during the day you can see light vertical lines or just a little blurry pic.. but the closer ones to the dvr have a nice picture..

  25. Posted

    Hi. Do you have that camera behind glass is the first question

     

     

    no just the camera.. and i gave all them enough amperage but still getting the effects of low power. i need to test out the ends of those long runs to see but i assumed 200ft or less is short runs and should have any issues..

     

     

    How did you take that image you posted ??

    You can clearly see an image of someone .... So if not behind glass then your other problem is ghosting.

     

    its a snapshot of the mobile app live view.. and its the same as if you were to see it on the monitor.. i did the voltage calulator and if thats true im getting way to low voltage on a 180ft run using CCA garbage lol im going to power it closer to the camera and hopefully that resolves the issue.. Qustion though how is that the lower Amps go longer distance than higher amps? you think if i lower the Amps it will get the voltage to the cameras? but then its lower amps and the camera needs at least 700-1000MA?

×