Contents1 How to Read these Operating Instructions 3Approvals 3Symbols 3Abbreviations 42 Safety and Conformity 53 Introduction to Extended Relay Card MCB 113 7Connection Schematic 7Connection Schematic - Following NAMUR 8Galvanic Isolation 9Electrical Data 9Ordering Numbers 94 How to Install 11Installation of Option in the Frequency Converter 115 Parameter Set-up 135-** Digital In/Out 136-** Analog Outputs 2514-** 24 V DC External Supply 2716-** Data readouts 28FC 300 Extended Relay Card Operating In-structions ContentsMI.33.G3.02 - VLT® is a registered Danfoss trademark 1