Reply To: VFD Drive Fault Contact Home › Welcome To PLCGurus.NET Live & Interactive Forum! › Live PLC Questions And Answers › Rockwell, Allen-Bradley, Stratix › VFD Drive Fault Contact › Reply To: VFD Drive Fault Contact June 17, 2018 at 10:02 pm #2639 John C JonesModerator Karma Points: 141Rank: Jedi Hello RAJ, If your 24VDC input card has a common of 0vdc or neg(-) of the power supply you are using then you need 24VDC+ on either contact. The other contact wire should go back to the input terminal you want to use. Hope the pic came out OK. See Attachment Attachments:You must be logged in to view attached files.