Baldor NXE100-1608Dx Installation manual - 4.4 Other I/o
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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 e100, 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 NXE100-16xxSx, 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