Baldor NextMove PCI, Руководство по установке

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4-16 Input / Output MN1903
4.5.2 Encoder input frequency
The maximum encoder input frequency is affected by the length of the encoder cables.
The theoretical maximum frequency is 7.5 million quadrature counts per second. This is
equivalent to a maximum frequency for the A and B signals of 1.87MHz. However, the effect of
cable length is shown in Table 3:
Frequency
Maximum cable length
Frequency
meters feet
1.3MHz 2 6.56
500kHz 10 32.8
250kHz 20 65.6
100kHz 50 164.0
50kHz 100 328.1
20kHz 300 984.2
10kHz 700 2296.6
7kHz 1000 3280.8
Table 3 - Effect of cable length on maximum encoder frequency
The maximum recommended cable length is 30.5m (100ft).