YASKAWA V7 Technical Manual

Also see for SI-T/ V7: Instructions

Contents

5-6A. n083 : Prohibited Frequency 1 Factory setting (each): 0.00n084 : Prohibited Frequency 2 Range (each): 0.00 to 400.0 Hzn085 : Prohibited Frequency 3These parameters allow programming of up to three prohibited frequency points for eliminatingproblems with resonant vibration of the motor/machine. This feature does not actually eliminate theselected frequency values, but will accelerate and decelerate the motor through the prohibitedbandwidth.B. n086 : Prohibited Frequency Deadband Factory setting: 0.00Range: 0.00 to 25.50 HzThis parameter determines the width of the deadband around each selected prohibited frequencypoint.EXAMPLE:Vibration encountered between 30.00 and 36.00 Hz.SOLUTION: Set n083 to " 33.00 ". This is the center of the problemfrequency band.Set n086 to " 3.00 ". This will cause the Drive to reject allfrequency command values between 30.00 and 36.00 Hz.A frequency command in the deadband will be converted to the bottomvalue of the deadband, e.g. a command of 33.00 Hz would result in a runfrequency of 30.00 Hz.NOTE: n083 > n084 > n085 - The highest prohibit frequency required needs to be in n083.The next highest prohibit frequency needs to be in n084, and the lowest prohibit frequencyneeds to be in n085.FREQ. CMD36.00 Hzn083 = 33.00 Hz30.00 Hz0Total Deadband = 6.00 Hz± n086 (3.00 Hz)OUTPUT FREQUENCY (Hz)5.6 CRITICAL FREQUENCY REJECTION