Rockwell Automation 1771-QB Linear Pos. User Manual

Page 47

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Installing the Linear Positioning Module

Chapter 5

5Ć8

Using Twisted Wire Pairs

It is recommended you use twisted wire pairs for a signal and its return path to
reduce noise levels further. Figure 5.5 shows a twisted pair and shielded twisted
pair.

Figure 5.5

Shielded Twisted Pair Diagram

50046

Twisted Pair

Shielded Twisted Pair

ATTENTION: Failure to follow correct shielding procedures can
cause unpredictable movement resulting in possible injury to
personnel and damage to equipment.

Connecting AC Power

Figure 5.6 shows AC power and ground connections. Incoming AC connects to
the primary of an isolation transformer. The secondary of the isolation
transformer connects to:

the power supply for the discrete inputs

the power supply for the discrete outputs

the power supply for the I/O chassis

the power supply for the analog outputs

the power supply for the transducer circuits

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