FR-F700 INSTRUCTION MANUAL (BASIC) - MRO Stop

Wiring(2) Notes on earthing (grounding)• Leakage currents flow in the inverter. To prevent an electric shock, the inverter and motor must be earthed (grounded). Thisinverter must be earthed (grounded). Earthing (Grounding) must conform to the requirements of national and local safetyregulations and electrical codes. (NEC section 250, IEC 536 class 1 and other applicable standards)• Use the dedicated earth (ground) terminal to earth (ground) the inverter.(Do not use the screw in the casing, chassis, etc.)• Use the thickest possible earth (ground) cable. Use the cable whose size is equal to or greater than that indicated in theabove table, and minimize the cable length. The earthing (grounding) point should be as near as possible to the inverter.To be compliant with the European Directive (Low Voltage Directive), earth (ground) the inverteraccording to the instructions on page 140.(3) Total wiring lengthThe overall wiring length for connection of a single motor or multiple motors should be within the value in the table below.Pr. 72 PWM frequency selection Setting(carrier frequency)0.75K 1.5K 2.2K or More2 (2kHz) or less 300m 500m 500m3 to 15 (3kHz to 14.5kHz) * 200m 300m 500m* For the 75K or more, the setting range of Pr. 72 PWM frequency selection is "0 to 6".Total wiring length (1.5K or more)500m or less300mWhen driving a 400V class motor by the inverter, surge voltages attributable to the wiring constants may occur at themotor terminals, deteriorating the insulation of the motor.Take the following measures 1) or 2) in this case.1) Use a "400V class inverter-driven insulation-enhanced motor" and set frequency in Pr. 72 PWM frequency selectionaccording to wiring lengthWiring Length50m or less 50m to 100m exceeding 100mPr. 72 PWM frequency selection Setting14.5kHz or less 9kHz or less 4kHz or less(carrier frequency)2) Connect the surge voltage suppression filter (FR-ASF-H) to the 55K or less and the sine wave filter (MT-BSL/BSC)to the 75K or more on the inverter output side.CAUTION· Especially for long-distance wiring, the inverter may be affected by a charging current caused by the stray capacitances of thewiring, leading to a malfunction of the overcurrent protective function or fast response current limit function or a malfunction or faultof the equipment connected on the inverter output side. If fast-response current limit function malfunctions, disable this function.(For Pr.156 Stall prevention operation selection, refer to the Instruction Manual (applied) chapter 4.)· For details of Pr. 72 PWM frequency selection , refer to the Instruction Manual (applied) chapter 4. (When using an optional sine wavefilter (MT-BSL/BSC) for the 75K or more, set "25" in Pr.72 (2.5kHz)).· For explanation of surge voltage suppression filter (FR-ASF-H) and sine wave filter (MT-BSL/BSC), refer to the manual of eachoption.300m300m + 300m = 600m16