Hi
I have a 3.0 kW Chinese HY Vfd

The image is the same as my vfd,
Terminal 9 states it is the earth connection, if you look at the bottom left and right there are 2 more screws with the earth symbol next to them,

If I test between the 2 bottom earths I have continuity, if I test between either of the bottom earths to the metal back of the vfd I have continuity,

But on terminal 9 I have nothing between the 2 bottom earth screws or the metal back of the vfd, I would of thought they would all be connected,

Can some one tell me if they are all like that or have I got a faulty one.
Many thanks Paul