6 -4Carrier FrequencyWhen selecting the carrier frequency, observe the following precautions items.• When using a device with C6-01 set to 1 (VT), adjust the carrier frequency according to the cases shownbelow.If the wiring distance between Inverter and motor is long: Set the carrier frequency low. (Use the followingvalues as guidelines.If speed and torque are inconsistent at low speeds: Set the carrier frequency low.If Inverter noise is affecting peripheral devices: Set the carrier frequency low.If leakage current from the Inverter is large: Set the carrier frequency low.If metallic noise from the motor is large: Set the carrier frequency high.Carrier frequency upper limit depends on the Inverter capacity. Refer to Factory Settings that Change with theInverter Capacity (o2-04) on page 5-83.• When using V/f control or V/f control with PG, you can vary the carrier frequency to match the output fre-quency, as shown in the following diagram, by setting C6-03 (Carrier Frequency Upper Limit), C6-04(Carrier Frequency Lower Limit), and C6-05 (Carrier Frequency Proportional Gain).*K is the coefficient determined by the set value in C6-03.C6-03 ≥ 10.0 kHz: K=310.0 kHz > C6-03 ≥ 5.0 kHz: K=25.0 kHz > C6-03: K=1Fig 6.1• With vector control, the carrier frequency is fixed by the Carrier Frequency Upper Limit in C6-03 if user-set, or by the carrier frequency set in C6-02.• To fix the carrier frequency, set C6-03 and C6-04 to the same value, or set C6-05 to 0.• If the settings are as shown below, OPE11 (Data setting error) will occur.Wiring Length 50 m or less 100 m or less Over 100 mC6-02 (carrier frequency)setting 0 to 6 (15 kHz) 0 to 4 (10 kHz) 0 to 2 (5 kHz)If Carrier Frequency Proportional Gain (C6-05) > 6 and C6-03 < C6-04.If C6-01 = 0 and Carrier Frequency Selection C6-02 is set from 2 to E.If C6-01 = 1 and Carrier Frequency Selection C6-02 is set from 7 to E.C6-03C6-04Output frequencyOutput frequency × C6-05× K*E1-04Max. Output FrequencyCarrier Frequency
