Delta VFD11AMS21AFSHA, User Manual

Page: 180 / 445

Chapter 12 Description of Parameter Settings

MS300
(High Speed Model)
12-01-9
Skip Frequency 1 (Upper Limit)
Skip Frequency 1 (Lower Limit)
Skip Frequency 2 (Upper Limit)
Skip Frequency 2 (Lower Limit)
Skip Frequency 3 (Upper Limit)
Skip Frequency 3 (Lower Limit)
Factory Setting: 0.0
Settings 0.0~1500.0 Hz

These parameters are used to set skip frequency of the AC drive. Frequency setting of the drive
will skip these frequency ranges. However, the frequency output is continuous. There is no limit
for the setting of these six parameters and it can be combined. Pr. 01-28 does not need to be
greater than Pr. 01-29; Pr. 01-30 does not need to be greater than
Pr. 01-31; Pr. 01-32 does not need to be greater than Pr. 01-33. Pr. 01-28~01-33 can be set as
required. There is no size
distinction between these six parameters.
 These parameters set skip frequency ranges of the AC drive. This function can be used to
prevent the mechanical resonance. The skip frequencies are useful when a motor has vibration at
a specific frequency bandwidth. By skipping this frequency, the vibration will be avoided. There
are 3 zones offered for use.
 Frequency command (F) can be set within the range of skip frequencies. Then the output
frequency (H) will be limited to the lower limit of skip frequency ranges.
 When accelerating / decelerating, the output frequency will still pass the skip frequency ranges.
0
01-28
01-29
01-30
01-31
01-32
01-33
Internal
frequency
command
Frequenc y s etting command
rising frequency
falling frequency
Zero-speed Mode
Factory Setting: 0
Settings 0: Output waiting
1: Zero-speed operation
2: Fmin (Refer to Pr. 01-07, 01-41)

When the frequency command of drive is less than Fmin (Pr. 01-07, Pr. 01-41), the drive will
operate by this parameter.
 When it is set to 0, the AC motor drive will be in waiting mode without voltage output from
terminals U, V, W.
 When it is set to 1, it will execute DC brake by Vmin (Pr. 01-08 and Pr. 01-42) in V/F modes.

When it is set to 2, the AC motor drive will run by Fmin (Pr. 01-07, Pr. 01-41) and Vmin
(Pr. 01-08, Pr. 01-42) in V/F modes.