Spectrum Controls 1762sc-IF4OF4, User Manual

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Chapter 2: Installation and Wiring 2-7
User’s Manual Pub. 0300247-01 Rev. D

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.
Inputs

If multiple power supplies are used with analog inputs, the power supply
commons must be connected.

For a thermocouple, use the shielded, twisted-pair thermocouple
extension lead wires specified by the thermocouple manufacturer. Using
the incorrect type of thermocouple extension wire or not following the
correct polarity will cause invalid readings.

The module does not provide loop power for analog inputs. Use a power
supply that matches the input transmitter specifications.
Outputs

Load resistance for a voltage output channel must be equal to or greater
than 1 KΩ.

Load resistance for a current output channel must remain between 0 and
500 Ω.
Grounding
WARNING
The possibility exists that a grounded or exposed thermocouple can
become shorted to a potential greater than that of the thermocouple itself.
Due to possible shock hazard, take care when wiring grounded or exposed
thermocouples.
WARNING
USE SUPPLY WIRES SUITABLE FOR 20 °C ABOVE
SURROUNDING AMBIENT TEMPERATURE.
WARNING
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.