Re: Running two different spindle motors from a single VFD?
A few precautions when using dual motors/contactors on the VFD output, Ideally the motors would have the same characteristics, at least the same pole count.
A reversing contactor pair could be used as these are not only mechanically interlocked, but can be electrically interlocked.
When operating the contactors, the particular contactor coil swap should only be enabled by setting a VFD output (by para) to sense At-Zero-Speed.
This output would be wired into the contactor coil logic.
Any contactor on the input side for E-stop purposes should have a contact to the VFD Stop Input, this turns off the power devices.
Any motor on a VFD when motoring, i.e. winding down does not harm the VFD or if the output power is disconnected at this point.
The biggest concern is if a motor was connected or swapped while the VFD was outputting a speed rate.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.