Frequently Asked Questions; Poc Power Supply; Long-Distance Feeding - Dahua HAC-HFW1801C-A User Manual

10 Frequently Asked Questions

PoC power supply

PoC XVR supports PoC function.
PoC camera can be divided into AT camera and AF camera. The power consumption of the AT
camera is less than 12 W and the power consumption of the AF camera is less than 6 W.
You must check the maximum power of PoC before using it. Assuming the maximum power
of an XVR is 48 W, the XVR can connect AT cameras up to 48/12=4 or AF cameras up to 48/6=8.
When the device is in PoC power mode, please do not connect other device between the
device and PoC XVR or PoC Transceiver, such as UTC, Balun, Optical Transceiver, Distributor,
Converter, etc.; otherwise the device may burn out.
PoC power has high voltage. Do not disassemble the device during normal operation;
Otherwise, it may endanger both the device and users due to high voltage.
long distance feeding
In many cases, our customers use long-distance power, transmitting 12VDC to cameras that
are more than 100m away. This type of feeding could cause problems.
Q1: Devices reboot repeatedly or there is an ICR failure.
Possible reasons: A long power cable can lead to large voltage drops of the equipment's
power cable, and turning on the IR light at night increases this voltage drop, resulting in the
device rebooting. After the device is rebooted, the ICR defaults to Day mode. Based on the
night ambient light, the device will work in Night mode, and then the infrared light will light
up, causing the device to reboot due to low voltage. In this way, the ICR is activated every 2
seconds, affecting its useful life.
Q2: Can't reboot the device at night, get black screen or reboot when activating ICR.
Possible reasons: A long power cord can lead to large voltage drops of the equipment's power
cord, and turning on the IR light at night increases the voltage drop, resulting in device reboot
and black screen.
Solution: During construction, if the camera location is far from the power supply, you need to
use a separate long-distance power supply or purchase a double DP power supply to use
24VAC power.
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