Prior to the implementation of the Haas Vector Drive, Haas Automation used variable frequency drive from a number of drive manufacturers such as Fuji, Mitsubishi, Magnatek and Yaskawa. Spindle Drives used in Haas machinery are variable frequency motor controllers. They vary the frequency and voltage to operate the electric motors.
The MOTIF PCB sends spindle speed commands to the spindle drive. The I/O PCB sends directional commands to the spindle drive. The spindle drive sends (3) signals to the I/O PCB. It will send a Spindle Stop, Spindle at Speed, or a Fault Signal command.