Wiring, Shield Connections - Control Techniques SM-Encoder Plus User Manual

4.2.2 SM-Encoder Output Plus
Figure 4-4 SM-Encoder Output Plus terminals
1
Table 4.2 SM-Encoder Output Plus PL1 terminal descriptions
Term
1
2
3
4
5
6
7
8
Table 4.3 SM-Encoder Output Plus PL2 terminal descriptions
Term
1
2
3
4
5
6
7
8
9
4.3

Wiring, Shield connections

Shielding considerations are important for PWM drive installations due to the high
voltages and currents present in the output circuit with a very wide frequency spectrum,
typically from 0 to 20 MHz. Encoder inputs are liable to be disturbed if careful attention
is not given to managing the cable shields.
Encoder mounting methods
There are three methods for mounting an encoder onto a motor:
1. Galvanic isolation between encoder and motor
2. Galvanic isolation between encoder circuit and encoder body
3. No Isolation
4.3.1 Encoder with galvanic isolation from motor
When galvanically isolated the encoder device is mounted to the motor with isolation
fitted between the motor housing / shaft and encoder as shown in Figure 4-5.
12
PL1
2 3 4 5 6
Ab
A
A\
B
B\
Ab Fd
A F
A\ F\
B D
B\ D\
SM-Encoder Plus & SM-Encoder Output Plus User Guide
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7 8 1 2
Encoder inputs
Fd
F
F\
D
D\
Z
Z\
0V
+V
Encoder outputs
Fr Ab.L
0V
0V
F A
F\ A\
R B
R\ B\
0V
Z
Z\
PL2
3 4 5 6 7
Fr
F
F\
R
R\
Fd.L
F
F\
D
D\
8 9
Issue: 4