The manual for my VC3Q (USA-model) says to use 12v AC external power.
THE POWER SUPPLY
An external 12V AC power supply provides the power for the unit.
DO NOT ATTEMPT TO POWER THE UNIT FROM ANY POWER SUPPLY OTHER THAN THE ONE SUPPLIED WITH THE UNIT.
Circuitry inside the VC3Q converts the 12V AC into 14.5-0-14.5V and a 48V DC supply for the phantom power.