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SM-Encoder Plus User Guide
www.controltechniques.com
Issue Number: 3
4.3
Terminal descriptions
Figure 4-3 SM-Encoder Plus terminals
Table 4.1 SM-Encoder Plus terminal descriptions
Figure 4-4
4.4
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
Term
Encoder
Ab
Fd
Fr
1
A
F
F
2
A\
F\
F\
3
B
D
R
4
B\
D\
R\
5
Z
6
Z\
7
0V
8
External power supply decoupling
PL1
1
2
3
4
5
6
7
8
Terminal 8 should be used to join the external encoder power supply to the encoder as
shown in Figure 4-4. If the drive encoder supply is to be used for two encoders, the user
must ensure the total load does not exceed 300mA for 5V and 8V encoders and 200mA
for 15V encoders.
NOTE
0V +V
Screen
connection
External encoder
power supply
