I've got col/mono camera's from a well known commercial distributor, 1 Amp 12Vdc psu's, doubled up alarm cable 35-55m cable runs (several cams involved) in every day col mode all's fine, but when the cam switches to to mono it cuts out! ie the power light is off. min voltage is 12.2 and 380 mh. The only way to get the cam back on is down and repower. Any ideas?

Scott

Hereford Security Services Ltd SSAIB

I've got col/mono camera's from a well known commercial distributor, 1 Amp 12Vdc psu's, doubled up alarm cable 35-55m cable runs (several cams involved) in every day col mode all's fine, but when the cam switches to to mono it cuts out! ie the power light is off. min voltage is 12.2 and 380 mh. The only way to get the cam back on is down and repower. Any ideas?

Scott

Hereford Security Services Ltd SSAIB

Are these day and night cams...ie colour day mode and mono night???...if so when the infra reds kick in it is obviously drawing too much from the psu

Are these day and night cams...ie colour day mode and mono night???...if so when the infra reds kick in it is obviously drawing too much from the psu

I'd replace the obviously with maybe.

I'd replace the obviously with maybe.

yeah well maybe but i read the post that he had numerous cams running off 1 X 1 amp psu??????......

In fact i think the term was 'serveral'

Edited January 9, 200719 yr by mjw

if you rmeove the cam and connect it straight to the psu is it ok then, and when in b/w mode there is 12.2v at the cam. Id suggest the cam mate if the previous is true

It's a Dantec 4x1 amp supply, 2 cams and 2 housings 1amp each. Tried cam on seperate 1 amp supply 3ft away did the same. orderd new cams same problem. no built in IR!

what voltage is at the cam when in bw mode?

also are you using a funny colour monitor (ie a cheapy one) some dont like ccir inputs (ie b/w) can you turn colour burst on in the cam?

ignore that he led wouldnt go out

id still say its the cam, what are they

Just a very quick thought, but if the changeover from colour to B/W is causing the shutdown, it may be that the sudden increase in current draw caused by a mechanical filter being shifted, is adversely affecting the cameras internal power supply board.

Try a camera on a short power lead (say two metres), and see if the problem occurs with that. If it doesn't, then as in a previous post, you either have to increase the conductor cross section (i.e. double up pairs) or increase the launch voltage, or possibly try a heavier duty regulated PSU.

If it does trip out, you could maybe get hold of some small 25v Electrolytic capacitors, and use one across the camera power supply input, to act as a smoothing capacitor; that may get rid of the problem (if you do go that route, make sure you connect the capacitor +ve lead to the +12v rail).

Excellent advise Jon,

What's the camera Scott?

We had this and it turned out to be the iris jamming on change over to mono. New cams and all sorted.