minor but irritaing PTZ fault

[nice111 0]

ok heres the story

I used to have an AV760 DVR conected to a (sony exview365 PTZ cam) simple conection using rg59 and seperate power run, there was also 3 static cams and a simple joystick controlloer for the PTZ

everything worked perfect for around 6 month then one day when controlling the PTZ there was suddenly video loss and i had to uplug power from cam and plug back in to get working again, over the next several weeks this same problem occured and seamed to get more and more frequent so it was time to troubleshoot

checked all conections and even replaced all plugs , connectors etc, problem remained

removed PTZ from site and made new short cable run (around 4 ft) to try it at the DVR/Joystick side and same problem

took out joystick controller and operated direct from dvr and still problem remained

decided could be loose wire or conection in PTZ as the problem only occured when attempting to move the cam so took the cam to peices looking for any wire or conection problesm and found nothing, reassemled and problem had gone away or so i thought.

refitted cam back in its site and everthing was fine untill around a month later when fault reoccured and as the problem had resolved after disasembly of cam last time i decided that has to be faulty and went and bout a new one

fitted new cam and all was good ( for about another month) then problem is back

obviously it wasnt the origanl cam at fault and by now i had given up more less on what to blame so didnt bother trying to move the cam anymore and just used it as a static cam instead and it stayed that way for another 12 months untill i decided to change the DVR for an Xvision unit and at same time changed from using rg59 to using cat5 in doing so thought as that was the last part of the system them maybe that would resolve the fault but the fault is still there

i have now noticed that if i control the camera slowly from the joystick then it continues working ok but if i try to move it reasonably qickly then the video dies or sometimes the cam will do a reboot on its own, but strange that it only seams to be when the cam is controlled at around half or more of the speed it is capable of doing

 

i do hope some of you guys out there might have some idea about this problem as it really is so annoying

thanks in advance

[SEANHAWG 1]

Judging by all of your troubleshooting performed, in my opinion, it seems to be a power supply issue. Does your PTZ take 12V DC or 24 VAC? Let us know about your power supply that you are using too, let us know the amp output.

[Numb-nuts 1]

If both cameras eventually suffered the same fault then something in your wiring is wrong and you did say you replaced the wiring with cat5 so my question is what is your voltage at the point of delivery and are you still using the same power supply?

 

Is the Camera an Xvision XSD27ZS by any remote chance? I only ask since you mention the Xvision DVR.

[Numb-nuts 1]

Why do we bother?

[nice111 0]

Hi, sorry guys, i never got any notifications about getting replies so appolgies For that but just so you know things have moved on slight because now i use an AVtech 78D dvr as i needed more cams and the xvision was only 4 channel, i havent looked any further into the issue on the ptz because i still dont know what to blame but over a period of time everthing has changed in the system as per my original post apart from one thing and thats what you guys mention the ptz power supply so, it uses 24vac and 4.5 amps and was originally run down seperate power cable and rg59 for video but as said before that has been replaced with cat5 and problem still present, i have now done away with the joystick i had and instead opted for a small unit that has its own dedicated remote control pureley for the ptz and that worked really well even on high speed for a couple of weeks untill the problem reared again so i have now set speed slow so i can at least have some control with the video loss, i just cant understand why everytime i replace somethinng the problem goes away for a short time and then re occures, what a nightmare, i will now change that cam power supply though unless you can think of anything else? thanks again guys

[tomcctv 190]

Hi. sounds like amps. when you used cat5 did you use one pair for video one pair for data and one pair for power ???

 

you should use two pair for power 1 pair for + and pair for -

[nice111 0]

i see where your coming from here and yes i did use one pair for video, one pair for power and one pair for data + and- but im not sure why the fault would have originally start when i had rg59 and seperate power unless of course that power line just detoriated with age although it had only been up approx 3 yrs??

would you sugest i i double up the pairs for the power then? the only problem in doing that if i remeber right is there would not be enough wires then for video and data with the cat5 although its been a while now and cant quite remeber how many wires are in there

[ljarrald 0]

i see where your coming from here and yes i did use one pair for video, one pair for power and one pair for data + and- but im not sure why the fault would have originally start when i had rg59 and seperate power unless of course that power line just detoriated with age although it had only been up approx 3 yrs??

would you sugest i i double up the pairs for the power then? the only problem in doing that if i remeber right is there would not be enough wires then for video and data with the cat5 although its been a while now and cant quite remeber how many wires are in there

 

there are 8 wires in there (4 pairs).

for troubleshooting, get a universal laptop charger (with variable output), set it to around 17vDC then connect it to the camera. this has worked for me. you then know where the problem is. (psu)

 

 

tomcctv, i use however many pairs i have left over (usually 3) but i use one of each pair so i get the polarity right. solid colour for +, dotted colour for -. is this uncommon practise?

[nice111 0]

there are 8 wires in there (4 pairs).

for troubleshooting, get a universal laptop charger (with variable output), set it to around 17vDC then connect it to the camera. this has worked for me. you then know where the problem is. (psu)

 

 

tomcctv, i use however many pairs i have left over (usually 3) but i use one of each pair so i get the polarity right. solid colour for +, dotted colour for -. is this uncommon practise?

 

ok i will get back up the ladder and try what you say say and put the wires together to see if it improves getting the required amps down to the camera

i cant try the PSU trick you suggest right now as i dont have one available so if it still doesnt work after putting the wires together then i will go and buy a new PSU

i will let u know how i get on

thanks

[survtech 0]

It could be the slip rings, which commonly fail in PTZs. One way to tell would be to spin the ptz around many times at high speed and see if that helps the problem. The spinning action tends to clean off the contacts between the rings and the brushes.