Power Diode Bypass on IP5M-T1277EW-AI?

TheWaterbug

Getting comfortable
Oct 20, 2017
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Palos Verdes
Has anyone opened up one of these and figured out which diode needs to be bypassed to bring 12 V out on the barrel jack when the camera is powered over POE, e.g. so that we can power an external illuminator from the camera?

Here's what I did with the older, cheaper, IP5M-B1186EW-28MM:

1733297506001.png
 
Question for you! What is the load you are putting on the Amcrest camera? VIA your 12v hack? I mean that camera can't have that big of a Voltage regulator in it?

TIA
 
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Thank you for the info, So looking at the 2 cameras and in the current case the camera is using max POE+ and even with removing the 10w IR and adding to your current setup the 20w IR my guess is that it would be to much for your camera to take. That is with your Current setup camera only using 5.6w max That is camera POE Max needs that isn't with the added 10w or 20w budget with the 10w it would put you over 17w and seeing you said it is work fine that means the regulator that is in the camera can support such loads and must be using a POE+ switch. Next with your question camera the Tech Sheet says POE max is 8.9w for the camera. Before you go and add the 20w or even a 10w I would try to find out what the 12v Regulator that camera is using because adding the loads up to the camera with a 20w IR would take your power needs upto the POE++ format of POE BT needing 32.4w and this is taking into the facts of the light being 85% efficient. So if you were to take the camera apart and find that the regulator was only able to support 1.25amp or 1.5amps then the camera and 20w IR would be to much for the camera to last to long. It would need to support 1.67amps Many cameras are not designed to support such loads and gotta keep in mind what type of heat this will cause as well. Most regulators in these small cameras are not with cooling by fan or by fins and the PCB might not even have a large enough ground plane to help with cooling if it even has one at all..
 
With several dahua cameras I've used to drive external IR I found that the 12 volt supply dropped below 12 volts when the external load was more than 4 watts, and I set my limit at 4 watts. It makes sense that the POE-to-12 volt circuitry was designed to support the camera plus its internal IR emitters, and not much more. I'm honestly surprised that a 10 watt load hasn't fried something in the camera. Then again, if you haven't measured the voltage with the 10 watt illuminator running, maybe it's down to a point where the camera still works but the illuminator isn't pulling its full load.
 
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Yeah, the cameras run a bit warm:



but they've been running for a good long while now, with no problems.

When I first set this up I had three cameras and two 4W illuminators all running off of one cheap POE extender powered from one POE+ switch port:

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When I swapped the 4W lights for the 10W lights one of the cameras started shutting off, so I redid the wiring:

1733351066922.png

and it's been fine ever since.

Next time I get a chance I'll bring my POE meter down there and see how much each setup draws.
 
And yes, the internal IR on both cameras is turned off.
 
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Personally I would get a POE BT injector or switch and an extender and pass to the cameras. Maybe even get a POE IR from iluminar and do it with little or no stress on your cameras.. But that is just me, I like to waste money so I have been told lOL..
 
The issue with this application is that it's almost 150' from that POE+ switch to the cameras, and I pulled the two strings of outdoor Cat5e thinking that I'd never need more than 2, so it's screw-clipped to the underside of a fence rail for about 100' of that distance, e.g. no easy way to pull more cable.