So, I have a customer with a VFD system - pretty simple single VFD (Emerson) - and he wants us to just send direct signals from the PLC output to the VFD drive. (VFD is in another room)
I've always used interposing relays with the VFD's control power to drive VFD I/O - it is just how things were done everywhere I have been.
Are there any disadvantages you have seen to using a sourcing output from a PLC into a VFD's digital input? Shouldn't I isolate these signals somehow?
I've always used interposing relays with the VFD's control power to drive VFD I/O - it is just how things were done everywhere I have been.
Are there any disadvantages you have seen to using a sourcing output from a PLC into a VFD's digital input? Shouldn't I isolate these signals somehow?