Terminal Descriptions; Wiring, Shield Connections - Control Techniques SM-encoder plus User Manual

4.3

Terminal descriptions

Terminal 8 should be used to join the external encoder power supply to the encoder as
NOTE
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.
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
12
Figure 4-3 SM-Encoder Plus terminals
1 2 3
Table 4.1 SM-Encoder Plus terminal descriptions
Term
Ab
1 A
2 A\
3 B
4 B\
5
6
7
8 External power supply decoupling
Figure 4-4
Screen
connection
www.controltechniques.com
PL1
4 5 6 7
Encoder
Fd
F
F\
D
D\
Z
Z\
0V
External encoder
power supply
0V +V
SM-Encoder Plus User Guide
8
Fr
F
F\
R
R\
Issue Number: 3