ANVIZ VF30 POE Issues

Have two VF30 powered by 12v external power supply.

Both, dont start up, conected directly to switch with POE.

If connected with a power injector, it power ups but not identified in switch

Anyone can help me?

Model ANVIZ VF30, Input DC12/POE, Firmware 06.48.F1, serial 1480200019290462

Thanks

PSardinha