A. n062 : Prohibited Frequency 1 (Jump Freq 1) Factory setting (each): 0.0
n063 : Prohibited Frequency 2 (Jump Freq 2)
Range (each): 0.0 to 400.0 Hz
These parameters allow programming of up to two prohibited frequency points for
eliminating problems with resonant vibration of the motor/machine. This feature does not
actually eliminate the selected frequency values, but will accelerate and decelerate the
motor through the prohibited bandwidth.
B. n064 : Prohibited Frequency Deadband Factory setting: 1.0
(Jump Bandwidth)
Range: 0.0 to 25.5 Hz
This parameter determines the width of the deadband around each selected prohibited
frequency point. The factory setting is " 1.0 ", which establishes a deadband of ±1.0 Hz.
EXAMPLE:
Vibration encountered between 30.0 and 36.0 Hz.
SOLUTION: Set n062 to " 33.0 ". This is the center of the problem
frequency band.
Set n064 to " 3.0 ". This will cause the drive to reject all
frequency command values between 30.0 and 36.0 Hz.
A frequency command in the deadband will be converted to the bottom
value of the deadband, e.g. a command of 33 Hz would result in a run
frequency of 30 Hz.
Note that if n062 ≤ n063 is not satisfied, the Digital Operator displays the parameter setting error
code " OPE6 Parameter Error", except when n063 equals zero.
FREQ. CMD
36 Hz
n062 = 33 Hz
30 Hz
0
Total Deadband = 6.0 Hz
± n064 (3.0 Hz)
OUTPUT FREQUENCY (Hz)
5-7
5.6 CRITICAL FREQUENCY REJECTION
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