biến tần delta phần 5

đoạn đường nối để ngăn chặn và chạy miễn phí để ngăn chặn Tần số Tần số tần số đầu ra tốc độ động cơ tần số đầu ra tốc độ động cơ hoạt động lệnh dừng lại theo thời gian eration decel | Unit 1 PWM Carrier Frequency Selections 115V 230V 460V Series Power to 5hp to Setting Range 2 to 12 kHz Factory Setting 8 kHz ffl This parameter determines the PWM carrier frequency of the AC motor drive. 4-38 Revision June 2007 0ELE ffl ffl Chapter 4 Parameters Carrier Frequency Acoustic Noise 2kHz Significant Electromagnetic Noise or leakage current Minimal Heat Dissipation Curre nt Wave Minimal Minimal 8kHz 12kHz Minimal Significant Significant Significant From the table we see that the PWM carrier frequency has a significant influence on the electromagnetic noise AC motor drive heat dissipation and motor acoustic noise. The PWM carrier frequency will be decreased automatically by the ambient temperature and output current of the AC motor drives. It is used to prevent AC motor drive overheat and extend IGBT s life. Therefore it is necessary to have this kind of protection method. Take an example of 460V models assume that the carrier frequency is 12kHz ambient temperature is 50 degrees C with single AC motor drive. If the output current exceeds 80 rated current the AC motor drive will decrease the carrier frequency automatically by the following chart. If output current is around 100 rated current the carrier frequency will decrease from 12k Hz to 8k Hz. Mounting method Method A Method B Frame A Revision June 2007 0ELE 4-39 Chapter 4 Parameters For 460V Senes 100 90 80 70 60 50 40 For 115V 230V Senes Motor Direction Control Factory Setting 0 Settings 0 Forward Reverse operation enabled 1 Rev erse operation disabled 2 Forward operation disabled ffl This parameter is used to disable one direction of rotation of the AC motor drive direction of rotation. Line Start Lockout Factory Setting 1 Settings 0 Disable. Operation status is not changed even if operation command source is changed. 1 Enable. Operation status is not changed even if operation command source is changed. 2 Disable. Operation status .