The Dreambox 500s and any clone that is derived from it is a waste of time for moving a dish unless the cable between the receiver and the dish is short, by short meaning under 5m and your prepared to mess with it for a few hours
The receiver just doesn't have the power required with its puny power supply
If you want to use it with a motor your best getting shut of it and getting a box thats upto the job.
The DM600 works well on a motor as does the DM7020. If your after something on the cheaper side of the market the Technomate TM600 & TM500 are also good with a motorised dish
You can also look at the IPbox 200s, these too are also good with motors
Nano