Critical Frequency Rejection - Veikong gpd 515/g5 Startup Manual

5 . 9 C R I T I C A L FREQUENCY REJECTION
A . d 3 - 0 1 : Prohibited Frequency 1
d 3 - 0 2 : Prohibited Frequency 2
d 3 - 0 3 : Prohibited Frequency 3
These parameters allow programming of up to three 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 . d 3 - 0 4 : Prohibited Frequency Deadband
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:
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.
FREQ. CMD
36 Hz
d3-01 = 33 Hz
30 Hz
Set d3-01 = 33.0. This is the center of the problem
frequency band.
Set d3-04 = 3.0. This will cause the drive to reject all
frequency command values between 30.0 and 36.0 Hz.
0
OUTPUT FREQUENCY (Hz)
Factory setting (each): 0 . 0
Range (each): 0.0 to 400.0 Hz
Factory setting: 1 . 0
Range: 0.0 to 20.0 Hz
Total Deadband = 6.0 Hz
5-13
± d3-04 (3.0 Hz)