Looking for a 24v 2.5A AC/AC power supply

itno · 3 Jul 2017 at 20:38

Been looking for a power supply for a colleague but having difficulties. The colleague has a security camera which requires a 24v 2.5A AC 50/60Hz power supply. Can find lots of 24v 2.5A DC power supplies for laptops but these are not a compatible power supply. Spoke to someone at work who thinks that the camera is probably meant to be connected to a mains like supply possibly stepped down from mains voltage using a transformer. However, my electronic skills aren't that good to build such a power supply.

So, does anyone know of a mains AC to 24v 2.5A AC power supply or point me in the direction of somewhere that can build such a power supply?

MTIA

Thekwango · 3 Jul 2017 at 21:00

Can't help as such but why don't you find out the security camera manufacturer and see if they have a website. They may well sell replacement power supplies. Or see if the power supply has make/model number and google that.

godinman · 3 Jul 2017 at 21:12

You're googling wrong, type '24v AC 2.5a CCTV psu'.

Edit - 2nd down the search - http://www.netviewcctv.co.uk/accessories/ptz-psu-24vac

Freefaller · 3 Jul 2017 at 21:16

edit: I see @godinman has found something

itno · 3 Jul 2017 at 21:25

godinman said:
You're googling wrong, type '24v AC 2.5a CCTV psu'.

Edit - 2nd down the search - http://www.netviewcctv.co.uk/accessories/ptz-psu-24vac

That's great, just what they are looking for!!!! Many, many thanks for this, you're a star!

godinman · 3 Jul 2017 at 21:40

No probs! It looks the same as the ones sent out with some domes I've used before. Give me a shout it you need a hand wiring it in..

Tealc · 3 Jul 2017 at 22:00

It doesn't need to be exactly 2.5A, could be more if required.

Essentially a 24v AC power supply is a 10:1 transformer in a box.

2.5A is fairly beefy though, 60VA so would be quite a large transformer.

They used to do 24v AC supplies for Christmas lights, especially outdoor motorised things.

itno · 3 Jul 2017 at 23:55

The help is much appreciated guys. Once the psu is resolved the next step is to connect to a 8ch (I think) dvr/nvr where the problem will be is the camera NTSC or PAL? I didn't have chance to take a good look at the camera or dvr. After that is controlling the camera via the menu which is accessed by taking the rear of the camera off or using RS-485, would prefer RS-485 as my colleague didn't have the keys to remove the rear panel off. Did notice a screw block terminal on the back of the dvr/nvr and wondered if that is a RS-485 connector.

godinman · 4 Jul 2017 at 07:17

Most likely was the 485 connection, reboot the ptz with the video connected and it should display it's protocol, baud rate and address (there is a chance it doesn't have a fixed one set and detects whatever the DVR is outputting, unlikely however). One you have the info just input it into the DVR menu for the channel the ptz is plugged into, connect the 485 (polarity is usually important but again sometimes auto sensing), the ptz and DVR should both have a '+' and '-' to make sure it's the right way round, no damage if done if it is backwards however, it just won't work.

As for pal/NTSC thing, it should all be pal if designed for the UK market but it should be clearly marked either way, some DVRs are selectable.

Or just ditch it all for an IP system and not have the hassle!

Energize · 4 Jul 2017 at 09:24

A CCTV camera that uses 60 watts of power?! Typical 4k cameras use in the region of 12-15 watts or less.

godinman · 4 Jul 2017 at 10:13

This is a PTZ (moving) camera probably with built in heaters and maybe IR lights. Also it's just the max PSU rating, actual use will be closer to 1.5a.

itno · 4 Jul 2017 at 20:41

godinman said:
This is a PTZ (moving) camera probably with built in heaters and maybe IR lights. Also it's just the max PSU rating, actual use will be closer to 1.5a.

This is pretty much the case except the camera is night vision so guess it requires more power? Does not move but does have a heater.