The Spectra Pro VPTZ needs to use POE+ to be powered on the indoor cameras. This is for both the regular operation of the camera and the fans.
Pelco Cameras, Pelco Video Management
Spectra Pro VPTZ when used indoors
The Spectra Pro VPTZ needs POE+ to power the camera functions,
Power the indoor unit with POE+ and if using an outdoor environmental it is best to use 24 VAC at 50 VA