Powering Cameras Remotly

[loudevents]

I am interested in powering 6 CCTV cameras from a central location, in order to avoid multiple PSU's and put a UPS on the whole CCTV system.

All cameras are currently running over CAT5 via baluns, the maximum cable run being approx 150m to an outbuilding on site, however most have no more than a 30m run. I think the maximum current draw of the furthest camera is 275mA with the IR LED's on, will check later this week.

I gather 24v AC is the usual voltage that is used to power cameras over any distance? Are there any suitable regulator modules available off the self, to regulate the 24v AC (or whatever voltage it is) to the 12v my cameras require? I don't mind building some small circuits to do the job if I have to. Although it shouldn't do, isn't there potential for the 24v AC to interfere with the video signal on the adjacent pair?

I gather the proper POE (Power Over Ethernet) uses 48v DC down all 4 pairs of the cat5 cable - is this used in the CCTV industry for remote powering of (non ip type) cameras.

Just need some pointers as to the best way of going about this using the kit I already have and keeping within the industry methods.

Thanks for any help!

Dan

[daveboy]

Its not an ideal situation but if your going to power down the cat 5's then double up on the cores eg use the brown pair for pos & orange pair for neg. Dantech do a good 8 way 1amp psu that should do the job.

[SUBS]

Its not an ideal situation but if your going to power down the cat 5's then double up on the cores eg use the brown pair for pos & orange pair for neg. Dantech do a good 8 way 1amp psu that should do the job.

8 X 275mA + 2.2A Plus you need to allow some 'headroom'

or have I missed something ?

[SUBS]

I am interested in powering 6 CCTV cameras from a central location, in order to avoid multiple PSU's and put a UPS on the whole CCTV system.

All cameras are currently running over CAT5 via baluns, the maximum cable run being approx 150m to an outbuilding on site, however most have no more than a 30m run. I think the maximum current draw of the furthest camera is 275mA with the IR LED's on, will check later this week.

I gather 24v AC is the usual voltage that is used to power cameras over any distance? Are there any suitable regulator modules available off the self, to regulate the 24v AC (or whatever voltage it is) to the 12v my cameras require? I don't mind building some small circuits to do the job if I have to. Although it shouldn't do, isn't there potential for the 24v AC to interfere with the video signal on the adjacent pair?

I gather the proper POE (Power Over Ethernet) uses 48v DC down all 4 pairs of the cat5 cable - is this used in the CCTV industry for remote powering of (non ip type) cameras.

Just need some pointers as to the best way of going about this using the kit I already have and keeping within the industry methods.

Thanks for any help!

Dan

cat5 loop resistance seems to vary for some reason. if its 18 ohms per 100, and you double it up you'll lose just over 3V, if its better stuff, 11 ohms per 100, ou lose 1.5V ish...not as bad especially if you have 13.2 V to start with.

I think System Q do a 24V DC to 12V DC convertor for a couple of quid. or if you like experimenting, try the PCB from an old boxed PSU, as a rectifier / stabilised PSU, or look up the RS or Maplins data sheets for 7812 regulator I.Cs

Your risk - up to you to know whats safe........these are just ideas that spring to mind.

[AdvancedAlarms]

8 X 275mA + 2.2A Plus you need to allow some 'headroom'

8 amp psu c/w 8 x 1 amp fuse per output

I am interested in powering 6 CCTV cameras from a central location, in order to avoid multiple PSU's and put a UPS on the whole CCTV system.

use a proper multi output cctv psu as metioned else where,

All cameras are currently running over CAT5 via baluns, the maximum cable run being approx 150m to an outbuilding on site, however most have no more than a 30m run. I think the maximum current draw of the furthest camera is 275mA with the IR LED's on, will check later this week.

using active baluns?

I gather 24v AC is the usual voltage that is used to power cameras over any distance? Are there any suitable regulator modules available off the self, to regulate the 24v AC (or whatever voltage it is) to the 12v my cameras require? I don't mind building some small circuits to do the job if I have to. Although it shouldn't do, isn't there potential for the 24v AC to interfere with the video signal on the adjacent pair?

over distance a psu would be local due to volts drop

I gather the proper POE (Power Over Ethernet) uses 48v DC down all 4 pairs of the cat5 cable - is this used in the CCTV industry for remote powering of (non ip type) cameras.

POE does not put power on every pair, also POE switches ain't cheap

Just need some pointers as to the best way of going about this using the kit I already have and keeping within the industry methods.

use a shotgun or composite cable,

[Matt the Teckie]

Have you thought about using video baluns that combine power and video? Vigitron do a good one. PM me if you need further information fella..

Matt