Planning the electrical installation58Connection of a motor temperature sensor to the drive I/OWARNING! IEC 60664 requires double or reinforced insulation between live partsand the surface of accessible parts of electrical equipment which are either non-conductive or conductive but not connected to the protective earth.To fulfil this requirement, the connection of a thermistor (and other similarcomponents) to the digital inputs of the drive can be implemented in three alternateways:1. There is double or reinforced insulation between the thermistor and live parts ofthe motor.2. Circuits connected to all digital and analogue inputs of the drive are protectedagainst contact and insulated with basic insulation (the same voltage level as thedrive main circuit) from other low voltage circuits.3. An external thermistor relay is used. The insulation of the relay must be rated forthe same voltage level as the main circuit of the drive. For connection, see theappropriate ACS800 Firmware Manual.Installation sites above 2000 metres (6562 feet)WARNING! Protect against direct contact when installing, operating and servicingthe RMIO board wiring and optional modules attached to the board. The ProtectiveExtra Low Voltage (PELV) requirements stated in EN 50178 are not fulfilled ataltitudes above 2000 m (6562 ft).Routing the cablesRoute the motor cable away from other cable routes. Motor cables of several drivescan be run in parallel installed next to each other. It is recommended that the motorcable, input power cable and control cables be installed on separate trays. Avoidlong parallel runs of motor cables with other cables in order to decreaseelectromagnetic interference caused by the rapid changes in the drive outputvoltage.Where control cables must cross power cables make sure they are arranged at anangle as near to 90 degrees as possible. Do not run extra cables through the drive.The cable trays must have good electrical bonding to each other and to thegrounding electrodes. Aluminium tray systems can be used to improve localequalizing of potential.
