Rockwell-automation T80001 Application Note Termination of Class 1 Div Manual de usuario descargar pdf (Pagina 1)

Trusted

AN-T80001

Issue 1 Sep 06 AN-T80001 1

Application Note

Termination of Class 1 Division 2 Outputs

Underwriters Laboratories Inc have confirmed that suitable non UL recognised termination resistors

may be used in Trusted systems, configured for Class 1 Division 2 applications.

The value of terminating resistors should be sized to provide the minimum load for the type of output

module; be capable of dissipating at least 2.5W and not have a surface temperature in excess of 50

degrees Centigrade above ambient temperature, when operating at maximum applied voltage.

For example, an 8451 requires a minimum load of 50mA, therefore a 680R +/- 5% resistor rated at

2.5W, mounted such that its maximum surface temperature does not exceed 50C above ambient,

when operating at a field voltage of 32Vdc, will comply with the requirements of Class 1 Division 2.

All termination resistors must be mechanically secured into terminal blocks or similar and need the

use of a tool to remove or disconnect them.

Issue Record

Issue

Number

Date Revised by Technical

Check

Authorised by Modification

1 Jan 07 Pete Stock Ray Brown Pete Stock Initial Issue

1 2

TrustedTM AN-T80001 Issue 1 Sep 06 AN-T80001 1 Application Note Termination of Class 1 Division 2 Outputs Underwriters Laboratories Inc have confi

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Rockwell-automation T80001 Application Note Termination of Class 1 Div Manual de usuario Pagina 1