68 - 23/May/97
3.2.13 Command: DF - Digital Filter
Function:
it allows to set a low-pass digital filter. The filter reduces high
frequency noise and resonances
When the Velocity Structure command is VS=0 or VS=1, the
velocity reference is filtered.
When the Velocity Structure command is VS=2 or VS=3, the
velocity error is filtered.
The value DF=0 switches the filter OFF
Syntax:
data monitoring:
n
address DF <CR>
data input:
n
address DF n <CR>
Address type:
axis
Unit of measure:
-
Range:
0 to 255. The filter bandwidth is:
f [Hz] = {ln[1/(1-DF/512)]}/(2
π∗
300 10
-6
)
Default:
0 (disabled)
Password:
yes
(
∗
) addressing:
no
Opposite to:
-
See also:
VS
Note: the DF command must be executed with digital Drive Enable disabled (via OF command) and the opto
Drive Enable enabled.
Examples:
n
2 DF 165 <CR>:
sets the filter bandwidth to 206 Hz for axis 2.
n
2 DF <CR>:
Interrogates axis 2 about the reference filter on the velocity reference. The answer will
be : "A02 DIG.FIL. REF. PAR. = 165".
Tab. 3.2 - Filter Bandwidth
DF Frequency
DF
Frequency
DF
Frequency
DF
Frequency
1
1 Hz
65
72 Hz
130
155 Hz
195
254 Hz
5
5 Hz
70
77 Hz
135
162 Hz
200
262 Hz
10
10 Hz
75
84 Hz
140
169 Hz
205
271 Hz
15
15 Hz
80
90 Hz
145
176 Hz
210
280 Hz
20
21 Hz
85
96 Hz
150
183 Hz
215
288 Hz
25
26 Hz
90
102 Hz
155
191 Hz
220
297 Hz
30
32 Hz
95
108 Hz
160
198 Hz
225
307 Hz
35
37 Hz
100
115 Hz
165
206 Hz
230
316 Hz
40
43 Hz
105
121 Hz
170
214 Hz
235
325 Hz
45
48 Hz
110
128 Hz
175
221 Hz
240
335 Hz
50
54 Hz
115
134 Hz
180
229 Hz
245
345 Hz
55
60 Hz
120
141 Hz
185
237 Hz
250
355 Hz
60
66 Hz
125
148 Hz
190
246 Hz
255
366 Hz
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