Amperage for Sony SNC-VB630 Camera
If this is the correct camera the specs says
Power Requirements
PoE system (IEEE 802.3af compliant), DC 12 V ± 10%, AC 24 V ± 20%
Power Consumption : 6.0 W max 

The current I = P / V
Then 500mA max to provide the camera with the power it may need.  

Also this site also states the max, not sure of the language but it does say 500mA max.