Spectrum-controls 1762sc-IF8U User Manual download pdf (Page 17)

Chapter 2: Installation and Wiring 2-7

User'sManualPub.0300243‐02Rev.B

Attention

EXPLOSION HAZARD

 In Class I, Division 2 applications, the bus connector must be

fully seated and the bus connector cover must be snapped in

place.

 In Class I, Division 2 applications, all modules must be

mounted in direct contact with each other as shown on page 2-

5. If DIN rail mounting is used, an end stop must be installed

ahead of the controller and after the last 1762 I/O module.

Section 2.6

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.

 Channels are isolated from one another by ±10 Vdc maximum.

 If multiple power supplies are used with analog millivolt inputs, the power

supply commons must be connected.

Terminal Block

 Do not tamper with or remove the CJC sensor on the terminal block. Removal of

the sensor reduces accuracy.

 For millivolt sensors, use Belden 8761 shielded, twisted-pair wire (or

equivalent) to ensure proper operation and high immunity to electrical noise.

 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.

 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.

Grounding

Attention

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.

Attention

USE SUPPLY WIRES SUITALE FOR 20°C ABOVE SURROUNDING

AMBIENT

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