Noise Prevention; Terminal Door Label; Removing And Replacing The Terminal Block - Spectrum Controls 1769 Series User Manual

2-12 Chapter 2: Installation and Wiring
User's Manual Pub. 0300244-02 Rev. A
• Ground the shield drain wire at one end only. The typical location is as
follows.
-
For grounded thermocouples or millivolt sensors, this is at the
sensor end.
-
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.
The terminal connections with CJC sensors are shown below:

2.7.4 Noise Prevention

• 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. (You can only ground one end at a time.)

2.7.5 Terminal Door Label

A removable, write-on label is provided with the module. Remove the label from
the door, mark your unique identification of each terminal with permanent ink,
and slide the label back into the door. Your markings (ID tag) will be visible
when the module door is closed.

2.7.6 Removing and Replacing the Terminal Block

When wiring the module, you do not have to remove the terminal block. If you
remove the terminal block, use the write-on label located on the side of the
terminal block to identify the module location and type.