Hi,

My DVX200 powers down after 15 minutes if not used ... I don't see anything in any manuals about changing this. Is it changeable?

There are two menu settings under "Other Functions",
"Economy (Batt)", which saves the battery after 5 minutes of no operation. It can be set to "ON/OFF".
"Economy (AC), whcih turns the camera off after 15 minutes without any operation. It can be set to "On/Off".
There are a few exceptions, where the camera is not switched into the power saving mode. It is described on page 177 of the English manual.

Regards,
Joachim