I understand the function for LAD9R1, LAD9R3...etc. What is the function of the high/low speed starter set ( LAD9PVGV )?
The reference LAD9R1 and LAD9R3 are the reverse connection kits for the contactors if you consider that the motor is a single speed motor.
If you need to design a dual speed motor Starter with reverse function,the kit LAD9PVGV comes very handy .
With this kit you can design a 2-speed reverse starter with 2 Nos 3 pole and 1No (4 pole ;2NO +2NC poles) power contactor.
The schematic Diagram and the instruction sheet for this reference are as attached.
PV and GV are symbolic for the Low speed and High speed respectively
PV : Petite vitesse
GV : Grand vitesse