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TR150 VFD Communication Troubleshooting
If communication is normal, the Com LED on the VFD keypad will fast and slow flash.
Normal VFD com voltage 4.73 to 4.15 VDC pulsing approximately 10 times a minute, no pattern.
If the modbus wires are crossed between the Adapter Board and the Relay Board you get 4.39 VDC
steady, the Com LED on the VFD keypad will be on steady and you will get W-017 Ctrl.word TO on the
VFD keypad.
Example – 1 and 2 crossed, 1 and 3 crossed.
If the Symbio Board is not communicating with the VFD but the VFD kinda knows something is out there
the Com LED on the VFD keypad flashes once every 5 seconds.
For Example – If one of the modbus wires is open but the ground is intact it looks like the VFD can see
part of the Symbio Board, but the Symbio Board can’t see the VFD. In this scenario the VFD Com LED
would flash once every 5 seconds but NOT have a W-017 Ctrl.word TO, but the Symbio Board will show
VFD not communicating.
If all 3 of the field comm wires are open, you will get 4.95 VDC steady, the Com LED on the VFD keypad
will be off and you will get W-017 Ctrl.word TO on the VFD keypad.
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