Nidec Control Techniques Digitax-SF DA21223, Instruction Manual, Page: 321 / 386

38
Digitax SF
Instruction Ma
nual
7. Tuning
3. Tuning Parameters
Function The smoothing filters smooth the position command and suppress vibrations�
Parameter
Position command filter 1: Type Select 66�0
Default:
0
Setting range:
0–3
Position command filter 4: Switch Select 66�1
Default:
1
Setting range:
0–1
Position command filter 1:
Smoothing 1 -Moving average counter 80�0
Default:
25 (
less than
750 W)
20 (
over
1 kW )
Setting range:
1–6,250
Position command filter 4:
Smoothing 2 -Moving average counter 81�0
Default:
10
Setting range:
1–1,250
Remark
Before setting any of the parameters, wait for at least 3 secs after the motor stops and
then set it while the command pulse is not being input�
Changing the parameter setting during pulse input or with presence of
residual
pulse
could cause shift in position� The larger setting will result in longer command time delay�
Tuning Tip
・Set Position command filter 1: Type (66�0) and Position command filter 4: Switch (66�1)
to “1”�
(*)
・Measure the vibration frequency on the torque command waveform or position
error
,
and set Position command filter 1 (and 4): Smoothing 1 (and 2) -Moving average count
(80�0 (and 81�0) to the value derived from the vibration frequency�
Calculation formula:
Motor Output Capacity Moving Average Count Derived from Vibration Frequency
50 W to 750 W 6,250
×(vibration frequency[s]) = parameter value
1 kW to 2 kW 5,000
In the example below, when the vibration frequency is 39 ms, the average count = 6,250
x 0�039 = 242; the delay time will be 39 ms�
5 Setting List of Parameters
Example: 50 W to 750 W
Before After
t
39 ms
t
Effect of Smoothing Filter
Position Command Smoothing Filters 1 and 2
Position
error