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Automating Manufacturing Systems - Process Control and ...

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plc electrical - 31.3<br />

terminals power interrupter motor starter<br />

L1<br />

L2<br />

L3<br />

M<br />

M<br />

M<br />

motor<br />

3 phase<br />

AC<br />

step down transformer<br />

0010<br />

0020<br />

start<br />

stop<br />

M<br />

0030<br />

M<br />

Aside: The voltage for the step down transformer is connected between phases L2 <strong>and</strong><br />

L3. This will increase the effective voltage by 50% of the magnitude of the voltage<br />

on a single phase.<br />

Figure 31.1<br />

A Motor <strong>Control</strong>ler Schematic<br />

The diagram also shows numbering for the wires in the device. This is essential for<br />

industrial control systems that may contain hundreds or thous<strong>and</strong>s of wires. These numbering<br />

schemes are often particular to each facility, but there are tools to help make wire<br />

labels that will appear in the final controls cabinet.

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