Spectrum Controls 1734sc-IE2CH - Manual (Page 20)

2-8 Point IO™ 2/4 Channel Analog HART Module
User’s Manual Pub. 0300257-01 Rev. A
Grounding
!
Attention
USE SUPPLY WIRES SUITALE FOR 10°C ABOVE SURROUNDING
AMBIENT
!
Attention
UTILISER DES FILS D’ALIMENTATION QUI CONVIENNENT A
UNE TEMPERATURE DE 10°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.
•
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.
•
If noise persists for a device, try grounding the opposite end of the cable shield
or ground both ends of the shield.
2.5.1 Wiring Diagram
Refer to the following wiring diagrams for field wiring connections.
Table 2-1 (4 Ch Terminal Block Pinout)
RTB Pin# Usage Usage RTB Pin#
0 Input 0 Input 1 1
2 Input 2 Input 3 3
4 Common Field Power 5
6 Chas GND Chas GND 7