Be sure the DMX level of the Autopilot control channel is appropriate for that beltpack. Go to RUN> LIGHT INFORMATION and look to see if the light is assigned to the right beltpack. If the console is not set up, then you can use the test menus to check this. Go to TEST> TEST LIGHTS and select the light and beltpack you wish to test. Then click on "Point Lights at Center Stage On/Off", this will check that the Autopilot has control of the light. If not, go to configure lights (hotlink) and make sure you have selected the correct light and operating mode in Autopilot. Also check the light for the proper switch selections.
Confirm that the above is correct. Go to SYSTEM SETUP> CONFIGURE LIGHTS or RUN> LIGHT INFORMATION. Another way to do this is to take manual (lighting console) control of the light. Do this by setting the level or the beltpack control channel to 0% and confirm that you have manual pan and tilt control of the light.
If the light is setup properly and the system tracks the beltpack, then the next problem could be the lights are not calibrated properly.
Confirm the "light calibration" using the TEST > TEST LIGHTS screen and click on "Point lights at Center Stage On/Off". All lights should point to the same location on the stage. If not, redo the light calibration procedure.
If the light is calibrated properly and the system tracks the beltpack, then the next problem could be zones.
Check the location of the operating boundary. Go to SYSTEM SETUP > SETUP ZONES / BOUNDARIES and inspect the location of the operating boundary. Be sure that the beltpack is in it.
Check the location of the zone. Go to SYSTEM SETUP > SETUP ZONES / BOUNDARIES and inspect the location of the zone. Be sure that the beltpack is in it. Also, go to TEST > TEST LIGHTS and follow the belpack -- this test mode ignores boundaries and zones.
The possible reasons might be: Overlap of the assigned DMX channels, or beltpacks are not assigned due to console not being connected.