Lust CDA3000 - Page 304

6-52
Application Manual CDA3000
6 Control modes
Maximum reference speed
The maximum reference speed indicates up to what speed the pulses of
the encoder can be evaluated by the input of the inverter module.
For specifications of the limit frequency for inputs ISD02 and ISD03 for
encoder evaluation refer to section 2.4 “Specification of control terminals”.
Formula for calculation of maximum reference speed depending on lines
per revolution of encoder:
SZ Lines per revolution
n
max
Maximum reference speed in [rpm]
f
max
Limit frequency of inverter input in [kHz]
Typical maximum reference speeds
The maximum frequency which can be delivered by the inverter is limited
bythedesignsize.
Encoder
lines per
revolution
pulses per rev
Maximum
reference speed
[rpm]
Maximum frequency
2-pole ASM 4-pole ASM
32 281250
4687
1)
9375
1)
64 140625
2343
1)
4687
1)
128 70312
1171
1)
2343
1)
256 35156
585
1)
1171
1)
512 17578 292
585
1)
1024 8789 146 292
2048 4394 73 146
4096 2198 37 74
8192 1098 18 36
16384 549 9 18
1) Maximum rotating field frequency dependent on inverter type
Table 6.25 Maximum reference speed when using encoders with differing
lines per revolution
n
max
f
max
kHz[]
SZ
----------------------- 10
3
60
1
min
---------⋅⋅=
3000
SZ
-----------
1
min
---------⋅=