Question On Axis 233D

We have a client with multiple 233D PTZ cameras. 2 of them were down for their parking lot and had been down for a while. The resident technician had said it was most likely bad fiber runs (they are the worst runs in the whole campus). I had my fiber test gear ready to diagnose but connected my laptop the the media convertor and had quick ping response and everything seemed fine. Went up to the camera with my meter and measured 24VAC as expected. They were in a Videoalarm outdoor housing and had a Altronix VR2T 24VAC to 12VDC convertor that states a 500mA max connection. Both of these were not working properly.

My question is why, if the 233D accepts 24VAC power, would you convert existing 24VAC to 12VDC when the spec sheet states a 22-40VDC 20W power consumption. Both VR2T had charred marks on them and blown caps. The cameras are now running fine on 24VAC. Another one we cleaned had signs that a VR2T was in place at some point but was removed from the circuit.

I just wasn't sure if the 233D preferred DC power to AC or there was some reason that I'm not aware of that I should be finding a replacement converter in the meantime. I'm always open to learning something new.

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