In SOLIDWORKS 2019 you can now add negative values for SOLIDWORKS Limit Angle Mate in the Mate Controller. In an assembly with a Limit Angle Mate, click on Insert > Mate Controller to open the Mate Controller property manager.
In the following example, a Limit Angle mate (-100 degrees to 100 degrees) controls the angle of robot head.
In the Mate Controller PropertyManager, click Collect All Supported Mates.
In Collect All Supported Mates, select a LimitAngle mate to change its values. For Position 1, we are entering a positive dimension for the LimitAngle mate and then click Update Position (for example 90 degrees).
Under Mates Positions, click Add Position. For Position 2 , we are entering 0 for the dimension and click Update Position. We are going to add a third position (position 3) and enter a value of -90 degrees for the Limit Angle mate and then update the position.