Baldor NXE100-1608Dx, Installation Manual

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Input / Output 4-15 MN1941
4.4 Other I/O
4.4.1 Encoder inputs 0-2
Location X5, X6, X7
Mating connectors: 9-pin male D-type
Pin Name Description
1 CHA+ Channel A signal
2 CHB+ Channel B signal
3 CHZ+ Index channel signal
4 Shield Shield connection
5 DGND Digital ground
6 CHA- Channel A signal complement
7 CHB- Channel B signal complement
8 CHZ- Index channel signal complement
9 +5V out Power supply to encoder
Three incremental encoders may be connected to NextMove e 100, each with complementary A,
B and Z channel inputs. Each input channel uses a MAX3095 differential line receiver with pull up
resistors and terminators. Encoders must provide RS422 differential signals. The use of
individually shielded twisted pair cable is recommended. A 5 V supply is provided on connectors
X5, X6 and X7 for powering the encoders. On models NXE100-16
xx S x , the same 5 V supply is
also present on connectors X2 and X3 for powering external circuits (see section 4.3.4). Ensure
that the total combined current demand of all 5 V outputs does not exceed 600 mA. If the total
current exceeds 1 A a self-resetting fuse will operate, which may take a few minutes to reset.
4.4.1.1 Encoder input frequency
The maximum encoder input frequency is affected by the length of the encoder cables.
The theoretical maximum frequency is 20 million quadrature counts per second. This is
equivalent to a maximum frequency for the A and B signals of 5 MHz. However, the effect of
cable length is shown in Table 1:
A and B signal
Maximum cable length
A and B signal
frequency
meters feet
1.3 MHz 2 6.56
500 kHz 10 32.8
250 kHz 20 65.6
100 kHz 50 164.0
50 kHz 100 328.1
20 kHz 300 984.2
10 kHz 700 2296.6
7 kHz 1000 3280.8
Table 1 - Effect of cable length on maximum encoder frequency
The maximum recommended cable length is 30.5 m (100 ft).
5 1
9 6
Enc 0 Enc 1 Enc 3