Isolated switch amplifiers |
KFD2-SR2-Ex1.W |
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Output: relay |
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24 V DC
•1-channel
•Control circuit EEx ia IIC
•Reversible mode of operation
•1 relay output with 1 changeover contact
•EMC acc. to NAMUR NE 21
•LB/SC monitoring
•LB/SC collective error message via Power Rail
•Usable up to SIL 2 acc. to IEC 61508
Function
The transformer isolated barrier transfers digital signals from the hazardous area. Sensors per DIN EN 60947-5-6 (NAMUR) and
mechanical contacts may be used as alarms. Control circuits are monitored for lead breakage (LB) and short circuit (SC). The external faults are indicated according to NAMUR NE44 by a red flashing LED. For type KFD2-SR2- Ex1.W, an LB/SC collective error message is in addition transferred through the Power Rail to the power feed module. The intrinsically safe input is per DIN EN 50020 safely isolated from the output and the power supply. The relay output is in accordance with IEC 61140 safely isolated from the power supply.
Input I EEx ia IIC
1+ |
3- |
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400 Ω ≤ R ≤ 2 kΩ |
1+ |
10 kΩ |
3- |
without SC |
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10 kΩ |
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2+ |
3- |
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without LB, SC 1+ |
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3- |
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1+ |
2+ |
3- |
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LB |
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SC |
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I |
II |
S3 |
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S1 |
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red |
&
yellow
7 8 9
Output
Composition
Subject to reasonable modifications due to technical advances.
Switch S3 in position I
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area |
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Switch S3 in position I |
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Hazardous |
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Switch S3 in position I |
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Switch S3 in position II
+ |
- |
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Safearea |
green |
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+ - |
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14 |
15 |
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Power |
Power |
LB/SC |
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supply |
Rail |
collective |
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only |
error message |
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KFD2-SR2-Ex1.W |
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103367_ENG.xml 2003-03-25
Copyright Pepperl+Fuchs, Printed in Germany
1 |
Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com |
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