Frequency Inverter DF51... - Moeller.com.tr

04/07 AWB8230-1541GB Selection criteriaSelection criteriaSelect a suitable frequency inverter according to the rated motorcurrent. The frequency inverter’s rated output current must begreater than or equal to the motor’s rated current.The following drive data is assumed to be known:• Type of motor (three-phase asynchronous motor)• Mains voltage = supply voltage of the motor (forexample 3 ~ 400 V)• Rated motor current (guide value, dependent on the circuit typeand the supply voltage)• Load torque (square-law, constant, with 1.5 times the startingtorque)• Ambient temperature (rated value 40 °C).hhIf several motors are connected in parallel to the output ofa frequency inverter, the motor currents are geometricallyadded, i.e. separately by active and reactive current<strong>com</strong>ponents. When you select a frequency inverter, makesure that it can supply the total resulting current.If you connect a motor to an operational frequencyinverter, the motor draws a multiple of its rated current.When you select a frequency inverter, make sure that thestarting current plus the sum of the currents of therunning motors will not exceed the rated output current ofthe frequency inverter.For the frequency inverter’s rated output current, see the section“Special technical data” in the appendix from page 193.Proper useThe DF51 frequency inverters are not domestic appliances. Theyare designed only for industrial use as system <strong>com</strong>ponents.The DF51 frequency inverters are electrical apparatus forcontrolling variable speed drives with three-phase motors. Theyare designed for installation in machines or for use in <strong>com</strong>binationwith other <strong>com</strong>ponents within a machine or system.After installation in a machine, the frequency inverters must not betaken into operation until the associated machine has beenconfirmed to <strong>com</strong>ply with the safety requirements of MachinerySafety Directive (MSD) 89/392/EEC and meets the requirements ofEN 60204. The user of the equipment is responsible for ensuringthat the machine use <strong>com</strong>plies with the relevant EU Directives.The CE markings on the DF51 frequency inverter confirm that,when used in a typical drive configuration, the apparatus <strong>com</strong>plieswith the European Low Voltage Directive (LVD) and the EMCDirectives (Directive 73/23/EEC, as amended by 93/68/EEC andDirective 89/336/EEC, as amended by 93/68/EEC).In the described system configurations, DF51 frequency invertersare suitable for use in public and non-public networks. Dependingon their location of use, external filtering may be necessary.A connection to IT networks (networks without reference to earthpotential) is permissible only to a limited extent, since the device’sbuilt-in filter capacitors connect the network with the earthpotential (enclosure). On earth free networks, this can lead todangerous situations or damage to the device (isolationmonitoring required).To the output of the frequency inverter (terminals U, V, W) youmust not:• connect voltage or capacitive loads (for example phase<strong>com</strong>pensation capacitors),• connect multiple frequency inverters in parallel,• make a direct connection to the input (bypass).Observe the technical data and terminal requirements. Foradditional information, refer to the equipment nameplate or labeland the documentation.Any other usage constitutes improper use.13