Lust CDA3000 - Page 303

Application Manual CDA3000
6-51
6 Control modes
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6
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Minimum reference speed
The minimum reference speed indicates the minimum speed as from
which at least one pulse of the encoder per scan cycle of the inverter
module can be evaluated.
Formula for calculation of minimum reference speed depending on lines
per revolution of encoder:
SZ Lines per revolution
n
min
Minimum reference speed in [rpm]
Minimum reference speeds
Encoder lines per
revolution
pulses per rev
Minimum reference
speed
rpm
Minimum frequency [Hz]
2-pole ASM 4-pole ASM
32 94 1.6 3.3
64 48 0.8 1.6
128 24 0.4 0.8
256 12 0.2 0.4
512 6 0.1 0.2
1024 3 0.05 0.1
2048 1.5 0.03 0.05
4096 0.8 0.02 0.04
8192 0.4 0.01 0.03
16384 0.2 0.01 0.01
Table 6.24 Minimum speeds when using encoders with differing lines per
revolution
n
min
200
4SZ⋅
-------------
60
1
min
---------
⋅⋅=
910
6
⋅
SZ
---------------
1
min
---------
⋅=