Dell 7202 with Docking Station Havis DS-DELL-601 not charging.

as in the title of the topic, after plugging the Tablet into the docking station and connecting the power supply to the docking station, the battery does not charge, USB and RJ45 sockets work properly when the power supply is connected to the tablet the battery is charged and the tablet works from the power supply.

Tablet model 7202

Docking station model DS-DELL-601