Vega KFD0-SCS-Ex1.55 Bedienungsanleitung PDF herunterladen

122609_ENG.xml 2003-03-25

Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany

Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com

KFD0-SCS-Ex1.55

SMART repeaters

Field circuit EEx ib IIC

Transmitter

Positioner

I/P converter

Current source

4 mA ... 20 mA

Voltage supply

Safe area Hazardous area

Measuring resistors

Supply circuit

SMART

communicator

SMART

communicator

U/I

2- 1+

8- 9+

50 mA

33 V

Composition

Transmission range 4 mA ... 20 mA

• 1-channel

• Field circuit EEx ib IIC

• Loop powered

• Lead monitoring

• Conductive for HART communication

(galvanically isolated)

• Universal application for transmitters,

position controllers and I/P

converters

• Only 5 V voltage drop

• Test sockets for HART

• EMC acc. to NAMUR NE 21

The universal module

KFD0-SCS-Ex1.55 does not require

auxiliary power for the isolation of

4 mA ... 20 mA current loops. It is

therefore, low in cost and has a

noticeably low power loss as compared

to active isolator modules. The module

isolates 4 mA ... 20 mA signals from

transmitters and positioners and is

therefore, bidirectionally HART

compatible. The HART transmitters and

HART positioners may thus, be

configured in the safe area as well as

the hazardous area. The low 5 V

voltage drop also allows for transmitter-

applications with unstable power

sources in the range of

20 V DC ... 30 V DC.

In addition, the voltage drop across the

resistance (load) of the active

measurement input must be considered

when calculating the field voltage

(terminals 1+ and 2-).

Lead breakage monitoring is possible

by means of the reaction of the field

current signal to the safe area, which

means the control system must monitor

whether the 4 mA ... 20 mA range was

exceeded or fallen short of.

The module may also be used for

controlling Ex-i valves, light signals, etc.

based on the internal voltage limits

(safe area). Terminals 8- and 9+ in this

case are driven with a 24 V binary

signal.

Function

1 2 3

Inhaltsverzeichnis

Seite 1 - Composition

1122609_ENG.xml 2003-03-25Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in GermanyPepperl+Fuchs Grou

Seite 2 - Technical Data

2Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in GermanyPepperl+Fuchs Group • Tel.: Germany +49 621

Seite 3

3122609_ENG.xml 2003-03-25Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in GermanyPepperl+Fuchs Grou