Spectrum-controls 1762sc-IF8U User Manual download pdf (Page 18)

2-8 MicroLogix™ 1200 IO Universal Input Module

User'sManualPub.0300243‐02Rev.B

Attention

UTILISER DES FILS D’ALIMENTATION QUI CONVIENNENT A

UNE TEMPERATURE DE 20°C AU-DESSUS DE LA

TEMPERATURE AMBIANTE

 This product is intended to be mounted to a well-grounded mounting surface

such as a metal panel. Additional grounding connections from the module’s

mounting tabs or DIN rail (if used) are not required unless the mounting surface

cannot be grounded.

 Under normal conditions, the drain wire (shield) should be connected to the

metal mounting panel (earth ground). Keep shield connection to earth ground as

short as possible.

 Ground the shield drain wire at one end only. The typical location is as follows:

o For grounded thermocouples or millivolt sensors, this is at the sensor

end.

o For insulated/ungrounded thermocouples, this is at the module end.

Contact your sensor manufacturer for additional details.

 If it is necessary to connect the shield drain wire at the module end, connect it to

earth ground using a panel or DIN rail mounting screw.

 Refer to Industrial Automation Wiring and Grounding Guidelines, Allen-

Bradley publication 1770-4.1, for additional information.

Noise Prevention

 Route field wiring away from any other wiring and as far as possible from

sources of electrical noise, such as motors, transformers, contactors, and ac

devices. As a general rule, allow at least 15.2 cm (6 in.) of separation for every

120V of power.

 Routing field wiring in a grounded conduit can reduce electrical noise.

 If field wiring must cross ac or power cables, ensure that they cross at right

angles.

 To limit the pickup of electrical noise, keep thermocouple and millivolt signal

wires as far as possible from power and load lines.

 If noise persists for a device, try grounding the opposite end of the cable shield

or ground both ends of the shield.

2.6.1 Wiring Diagram

Refer to the following wiring diagrams for field wiring connections.

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 37 38

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Spectrum-controls 1762sc-IF8U User Manual Page 18