ok.
dimmer pack 1 - dip switch 1 on
dimmer pack 2 - dip switch 1 and 3 on
dimmer pack 3 - dip switch 1 and 4 on
confirm you are switching them to ON and not to OFF.
Pack 1 will be channel 1 - 4
pack 2 will be channel 5 - 8
pack 3 will be channel 9 - 12