For motors or drives that are normally operated through simple on/off switches or contactors, the Caterpillar can automate that control using our relay expansion board. Rather than wiring to the motor or drive electronics directly, the board's relay outputs connect to whatever would otherwise be flipped by hand—a contactor coil, a VFD's digital inputs (see Variable-frequency drive), or any other low current switch-operated control point.
This makes it a convenient, driver-agnostic option: as long as a motor or drive can be commanded through dry-contact switch closures, it can be automated this way, without needing a dedicated speed/direction interface like PWM+DIR or a serial connection.
Need: number of relays and contact ratings on the expansion board, connector pinout, and example wiring diagrams for common cases (VFD digital inputs, contactor-driven 3-phase motor, etc.).