Spectrum Controls 1734sc-OE2CIH - Manual (Page 22)

2-8 Chapter 2: Installation and Wiring
User’s Manual Pub. 0300272-01 Rev. A.0
Section 2.5
Field Wiring
Connections
Consider the following when wiring your system:
General

Power and input wiring must be in accordance with Class 1, Division 2
wiring methods, Article 501-4(b) of the National Electric Code, NFPA 70,
and in accordance with the authority having jurisdiction.
 Use Belden™ 8761 or equivalent, shielded wire.

To ensure optimum accuracy, limit overall cable impedance by keeping a
cable as short as possible. Locate the module as close to input devices as the
application permits.

Digital and analog power must be supplied by an Isolated Secondary
Limited Energy Low Voltage source.
Outputs

The module provides loop power for analog outputs.
Grounding
NOTE
Use supply wires suitable for 10°C above surrounding ambient
temperature.

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:
-
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.
Refer to Industrial Automation Wiring and Grounding Guidelines, Allen-
Bradley publication 1770-4.1, for additional information.