[Cause]
The joint speed limits of gun A and gun B differ. During synchronized motion to the pressure application position, the joint speed limits of gun A and gun B must be equal.
[Countermeasure]
Set the maximum speed of both guns using the gun tuning utility. Open the gun tuning utility screen. Press F6[Dual gun]. Press F4[Speed] and select Yes in the displayed prompt to make the maximum speeds of both guns equal. Turn the controller power off and back on.