Guidelines for planning the electrical installation 75Implementing a motor temperature sensor connectionWARNING! IEC 60664 requires double or reinforced insulation between liveparts and the surface of accessible parts of electrical equipment which are eithernon-conductive or conductive but not connected to the protective earth.To connect a motor temperature sensor and other similar components to the drive, youhave four alternatives:1. If there is double or reinforced insulation between the sensor and the live parts of themotor, you can connect the sensor directly to the inputs of the drive.2. If there is basic insulation between the sensor and the live parts of the motor, you canconnect the sensor to the inputs of the drive if all circuits connected to the drive’sdigital and analog inputs (typically extra-low voltage circuits) are protected againstcontact and insulated with basic insulation from other low-voltage circuits. Theinsulation must be rated for the same voltage level as the drive main circuit. Note thatextra-low voltage circuits (such as 24 V DC) typically do not meet these requirements.3. You can connect the sensor to an extension module with basic insulation (eg, FAIO-01) or reinforced insulation (eg, FPTC-xx) between the sensor connector and the otherconnectors of the module. See the table below for the sensor insulation requirement.For sensor connection to the extension module, see its manual.4. You can connect a sensor to an external thermistor relay the insulation of which israted for the main circuit voltage of the drive. Drive I/O, I/O extension and encoder interface modulesSee:• section AI1 and AI2 as Pt100, Pt1000, PTC and KTY84 sensor inputs (XAI, XAO) onpage 91,• section DI6 (XDI:6) as PTC sensor input on page 92,• FPTC-01 thermistor protection module (option +L536) for ACS880 drives user’smanual (3AXD50000027750 [English]),• FPTC-02 ATEX-certified thermistor protection module Ex II (2) GD (option+L537+Q971) for ACS880 drives user’s manual (3AXD50000027782 [English]).This table shows what temperature sensor types you can connect to the drive I/Oextension modules as well as the insulation requirement for the sensor.Extension module Temperature sensortypeTemperature sensorinsulation requirementType Insulation/Isolation PTC KTY Pt100,Pt1000FIO-11 Galvanic isolation between sensorconnector and other connectors(including drive control unit connector)- X X Reinforced insulationFEN-xx Galvanic isolation between sensorconnector and other connectors(including drive control unit connector)X X - Reinforced insulationFAIO-01 Basic insulation between sensorconnector and drive control unitconnector. No insulation betweensensor connector and other IOconnectors.X X X Basic insulation. Connectorsof extension module otherthan sensor connector mustbe left unconnected.
