Electrical Installation; Wiring Guidelines - Siemens 353 User Manual

Installation

7.4 ELECTRICAL INSTALLATION

These sections contain electrical connection details for wiring a Siemens 353. Each case rear connector and
terminal is identified. Connector cover removal and separation of the removable portion of a connector from the
fixed portion is described in section 7.3.
Section 7.4.1 Wiring Guidelines contains specific information about connector removal for wiring, wire size, wire
stripping and other details that will be needed while wiring. Read this section before beginning to wire a controller.
Sections 7.4.2 through 7.4.11 contain wiring diagrams and, where needed, step-by-step procedures to describe I/O
and network wiring. Section 7.4.12 provides power input wiring information. Single controller and daisy chained
power wiring are illustrated.
•
Remove power from all wires and terminals before working on equipment.
•
In potentially hazardous atmosphere, remove power from equipment before
connecting or disconnecting power, signal, or other circuit.
•
Observe all pertinent regulations regarding installation in hazardous area.

7.4.1 Wiring Guidelines

Electrical Connections - Power, I/O, and Modbus network connections to a basic controller are completed through
removable connectors with terminals H, N, and 3-26. When the controller includes an I/O Expander board,
connectors with terminals 27-52 are also used. The case has an RJ45 connector for use when Ethernet networking
is utilized. Connector locations are shown in Figure 7-5. Individual terminals functions are also identified in Table
7-1.
Connectors - Power terminals are identified by a letter: Hot and Neutral. The ground connection is made to a green
case/safety ground screw located between connectors. Signal I/O terminals are identified by a number: 3 through
52. A connector terminal will accept the following wire(s).
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one 14-22 AWG (2.1-0.38 mm
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two 16 AWG (1.3 mm
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three 18 AWG (0.96 mm
Wire Size Recommendations:
•
signal wiring - 18 AWG (0.96 mm
•
power wiring - 18 AWG (0.96 mm
Wire Stripping Recommendations:
•
connector terminal wiring - 1/4" (6 mm) to 5/16" (8 mm)
•
green ground screw wiring - 1/8" (10 mm) to 1/2" (13 mm)
Be careful not to nick the conductor or cut away strands.
7-6
Electrical shock hazard
Explosion hazard
Can cause death or injury
2
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2
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2
)
2
)
2
)
WARNING
UM353-1B
April 2012