Burning out capture Cards

[grippo 0]

I installed a 32 Channel RP series Dvr into a car dealership adding on to their existing 16 cameras. We are up to 27 cams now. We have fried 2 sets of capture cards in the last 2 months. When i send them back to my supplier, they are damaged. The cards fail to record motion all the time. They record some motion but don't continue to record long enough on most motion. My supplier tells me there must be stray voltage coming into the capture card through the camera lines. Don't know how to test for this. Is it possible to put ground loop isolators on the lines to solve this problem. Today I went to check the old power supplies from the original install. One of the power supplies was putting out 44V Ac to the cameras. These are 24Vac cameras. Could this be causing issues??

[tomcctv 190]

hi. can you give a detailed list of your setup. just reading your post it could be lots of things to burn your cards out.

 

24v putting out 44v ....... did you have your meter set right ???............. 44v into a 24v camera = smoke and sparks.

 

 

My supplier tells me there must be stray voltage coming into the capture card through the camera lines.

 

if this is down to voltage down coax. you would have seen this as soon as you connected to the card.

 

but you could also have a problem if some cameras are fitted to a steel building.

 

 

 

The cards fail to record motion all the time. They record some motion but don't continue to record long enough on most motion.

 

 

this could also be that your dvr build does not have air cooling. building 8 or 16ways is ok but going 32 you need lots of fans (we run 8 on ours) some to take in air some to take out. a over heating card will give the same results.

 

 

can you list specs of your dvr / camera types / cable used (coax or cat5) type of power supply / and camera distance.

[grippo 0]

We were sent a replacement Dvr last week and it damaged the card as soon as I plugged in the cameras. Within 15 min. I was looking at recorded video and there were areas where there was motion and it just stopped recording in the middle of people moving in the frame.

The old system in there was an real old DM 16 channel that worked fine for years.

The original cameras that we connected to were Panasonic Box cameras. Most of them are 24 V and dual voltage. They were nice cameras in their day. Still give a pretty good picture.

There were 13 of them powered by two power supplies, one is a 12V and the other is 24V. There was also a transformer on some of the domes that were in the service bays. We put in a Sentry RP Series hybrid Dvr with an i5 motherboard and 2Tb HDD. The original cabling is all coax. The only strange thing is that the power comes out of the two boxes, goes up to the roof and then splits out to about a dozen cameras from there, through 18- 2 cable. We put in Siamese cable when we added 3 runs on the roof and a separate power box with 4 channels that power each camera. We used Cat5 and baluns for the other new runs inside the building and used a 12v 4 channel power supply. The boards were damaged with the old cameras even before we added our new stuff.

Hope this gives you a good idea of what is in there.

Really appreciate your time.