Download 1771-6.5.25, Servo positioning Assembly User Manual

Chapter 6
Installing the Assembly
Connecting AĆB Encoder and
Drive
5.
Connect the tachometer high signal to terminal 11.
6.
Connect the tachometer low signal to terminal 12.
7.
Connect the shields of the cable segments.
8.
Connect the shield to ground at the I/O chassis end.
Figure 6.1 shows the jumpers in the position in which we place them for
shipping the 1771-ES expander to you. These channel polarity jumper
settings select high-true polarity. These channel signal mode jumper
settings select differential mode. This marker logic jumper setting selects
the marker to be gated with channel A and channel B. If you use the
Allen-Bradley 845N-SJDN4-C encoder, leave the jumpers set to the
position shown in Figure 6.1.
With the jumpers set as shown in figure 1, connect the 845N-SJDN 4-C
encoder to the 1771-ES expander as shown in Figure 6.16. We show the
channel A signal connection reversed with the not channel A connection
and the channel B signal connection reversed with the not channel B
connection. This inversion of the channel A and B polarity allows the
marker to be high at a time when both channels A and B are high.
Use an 8 to 15V dc power supply for the input circuits. Connect the plus
side of the supply voltage to pin E of the encoder. With this
configuration, 5V dc power is generated at the encoder; the signals from
the encoder are 5V dc.
6Ć27