Spectrum Controls 1762sc-IF4OF4 User Manual page 19

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Inputs
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Outputs
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Grounding
The possibility exists that a grounded or exposed thermocouple can
WARNING
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.
USE SUPPLY WIRES SUITABLE FOR 20 °C ABOVE
WARNING
SURROUNDING AMBIENT TEMPERATURE.
UTILISER DES FILS D'ALIMENTATION QUI CONVIENNENT A
WARNING
UNE TEMPERATURE DE 20 °C AU-DESSUS DE LA
TEMPERATURE AMBIANTE.
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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.
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.
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.
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.
Chapter 2: Installation and Wiring
User's Manual Pub. 0300247-01 Rev. D
2-7