I use 12v 4amp adapter to power up a ptz camera with power cable of 20m but the camera didn’t power up please what can I do
You are more than likely experiencing a voltage drop over the 20M cable.
Does the camera power on okay when plugged in to the power source directly?
I had the exact same issue with a 601-D20X when using a smaller gauge 12v power lead to extend the power to camera, I had to remove the wire and bring a power outlet closer to the camera and plug it in directly with 12V 4A power supply.
Working fine since.
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