Installing the moduleSee section Installing optional modules in chapter Electrical installation.■ 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 284).Motor thermistor connectionDescriptionMarkingPTC connectionPTC IN60Ground (earth) potentialPTC IN61Relay outputDescriptionMarkingCommon, CRO PTC C62Normally open, NORO PTC B63External power supplyThe external power supply is needed only if you want to connect an external back-up powersupply for the drive control unit.Note:CMOD +24V external power supply terminals are not in use with CCU-24 control unit.External power supply to CCU-24 is connected to terminals 40 and 41 on the control unit.DescriptionMarkingExternal 24 V (AC/DC) input24 V AC/DC + in40External 24 V (AC/DC) input24 V AC/DC - in41General cabling instructionsObey the instructions given in chapter Guidelines for planning the electrical installation.282 Optional I/O extension modules