■ Electrical installationWARNING!Obey the instructions in chapter Safety instructions. If you ignore them, injury ordeath, or damage to the equipment can occur. If you are not a qualified electrician,do not do electrical work.Make sure that the drive is disconnected from the input power duringinstallation. If the drive is already connected to the input power, wait for5 minutes after disconnecting the input power.Necessary tools and instructions• Screwdriver and a set of suitable bits• Cabling toolsTerminal designationsFor more detailed information on the connectors, see section Technical data (page 159).Relay outputsDescriptionMarkingCommon, CRO4C50Normally closed, NCRO4A51Normally open, NORO4B52Common, CRO5C53Normally closed, NCRO5A54Normally open, NORO5B55115/230 V inputsDescriptionMarking115/230 V input 1HDI770115/230 V input 2HDI871Neutral pointNEUTRAL 1)72115/230 V input 3HDI973115/230 V input 4HDI1074Neutral pointNEUTRAL1)75115/230 V input 5HDI1176115/230 V input 6HDI1277Neutral pointNEUTRAL1)781) Neutral points 72, 75 and 78 are connected.General cabling instructionsObey the instructions given in chapter Guidelines for planning the electrical installation.Optional I/O extension modules 157