tailieunhanh - tài liệu hướng dẫn sử dụng biến tần danfoss phần 8

giá trị thông tin phản hồi thấp hơn giá trị thiết lập trong Cảnh báo tham số 228: cao hiện nay, IHIGH. Relay 123: Chỉ được sử dụng trong kết nối với Profibus. Đảo chiều: Các ổ đĩa đang chạy theo hướng ngược lại. Cảnh báo nhiệt: Trên giới hạn nhiệt độ động cơ hoặc ổ đĩa có thể điều chỉnh tần số, hoặc từ một nhiệt điện trở kết nối với một đầu vào kỹ thuật số. | VLT 2800 Series 444 Process PID lowpass filter time PROC FILTER TIME Value - Function Noise in the feedback signal is dampened by a first order lowpass filter to reduce noise impact on the process regulation. This can be an advantage . if there is a lot of noise on the signal. Description of choice Select the required time constant t . If a time constant t of is programmed the cut-off frequency for the lowpass filter will be 1 10 RAD sec. corresponding to 10 2 x n Hz. The process regulator will thus only regulate a feedback signal that varies by a frequency lower than Hz. If the feedback signal varies by a higher frequency than Hz it will be dampened by the lowpass filter. selected if in parameter 200 Output frequency range a selection has been of Clockwise only. Select OK - both directions 2 if the motor is able to rotate in both directions when cutting in. Select DC brake and start if the drive is to brake the motor by means of the DC brake first and then start. Ensure that parameters 126 127 and 132 are set appropriately. Select DC brake and start if the motor may be externally driven at a significant speed in the reverse direction. Limitations - Too low inertia will lead to load acceleration which can be dangerous or prevent correct catching of a rotating motor. Use the DC brake instead. - A driven rotating motor or windmilling motor with high inertia may cause a drive trip with flying start. Use DC brake and start. - Flying start does not work at values lower than 250 rpm. 445 Flying start FLYINGSTART Value Off DISABLE 0 OK - same direction OK-SAME DIRECTION 1 OK - both directions OK-BOTH DIRECTIONS 2 DC brake and start DC-BRAKE BEF. START 3 Function This function makes it possible to catch a rotating motor shaft which is no longer controlled by the unit . because of a AC line drop-out. The function is activated each time a start command is enabled. For the unit to be able to catch the rotating motor shaft the motor .