The 4 position NC turret could not change the tool number 4 to tool number 1, but it resumed after restart the power.

NC turret change tool under Jog mode is fine, and the tool numbers of the Diagnose page are normal, but after machining for a while, the problem come again.

Check the 24V of the NC turret and it was fine, but there was 143k resistance value between the 24V and 0V, at this moment all the tool numbers gone.

This could be the cable of 24V broken and shorted circuit to the housing of the NC turret, change the cable of 24V power supply, the problem’s solved.

Four station tool post:

http://www.cncmakers.com/cnc/controllers/Tool_Post_Turret/Four_Station_Tool_Posts_HAK21.html