The left magnetic contactor (red mark) is for JOG and RUN.
The Right magnetic contactor (blue mark) is for UP.
When hold UP , the contactor will work (ON) , then blue 2T1, 4T2, 6T3 have all 220V , then the blue circle for 2T1, 4T2, 6T3 will connect to the red circle which on the right side , then go through overload relay .
User need to hold the JOG /RUN, to test U1, V1, W1 .
If U1, V1, W1 happen phase fail → JOG/RUN contactor is damaged.
Then under the UP hold status to check U1, V1, W1 again.
If U1, V1, W1 with all 220V OK → UP contactor is normal.
If U1, V1, W1 happen phase fail → UP contactor is also damaged.