KFD2-SRA-EX4 Datasheet, PDF (1/4 Pages) List of Unclassifed Manufacturers – Transformer Isolated Barriers

Transformer Isolated Barriers
KFD2-SRA-Ex*
Output: Relay
• Control circuit EEx ia IIC
• 24 V DC nominal supply voltage
• Reversible mode of operation
• Lead monitoring (short circuit LK and
interruption LB) with LED indicator
(red flashing), switching output and
signal on Power Rail
• 50 % less wiring 2 : 1
• 2 relay outputs, 1 NO contact per
channel, grouped into single-pole
pairs
• EMC acc. to NAMUR NE 21
4-channel
KFD2-SRA-Ex 4
KFD2-SRA-Ex4
2-channel
KFD2-SRA-Ex 2
KFD2-SRA-Ex2
Input I
-+
1
-
R₂
1
Input EEx ia IIC
Input II
III
-+
3
+-
R1
R₂
3
-+
4
+-
R1
R₂
4
only KFD2-SRA-Ex4
IV
-+
6
+-
R1
R₂
6
2:1 Mode
Switch S2 in position I
+
Resistor for
R1
LB and SC:
R1 = 400 Ω ≤ R ≤ 2 kΩ
R2 = 10 kΩ
1-
2+ 2+
3-
4- 5+ 5+ 6-
Switch S2 in position II
1-
2+
3-
4- 5+
6-
yellow
S2
LB
SC
red ^S1
I II II I
yellow
LB
SC
S2
S1
red
I II II I
S6
S5
S4
S3
+-
1
Function
The transformer isolated barrier trans-
fers digital signals from the hazardous
area. The inputs are designed for the
connection of NAMUR sensors per
DIN EN 60947-5-6 or a mechanical
contact.
The input, output and power supply are
galvanically isolated from each other.
The relay output and the power supply
are galvanically isolated from each
other per DIN EN 50178 with a design
isolation voltage of AC 50 V.
Aufbau
7 89
Output I
Output II
10 11 12
Output III
Output IV
+-
14+ 15-
Power _{Power LB-collective}
supply _{rail error message}
Application
Min/Max manometer, valve positioners,
magnetic immersion probes with 2
switch points.
Two signals can be monitored through
one dual lead in the 2:1 mode of opera-
tion (AC), reducing wiring by fifty per-
cent.
Subject to reasonable modifications due to technical advances.
Copyright Pepperl+Fuchs, Printed in Germany
1
Pepperl+Fuchs Group • Tel.: Germany (06 21) 7 76-0 • USA (330) 4 25 35 55 • Singapore 7 79 90 91 • Internet http://www.pepperl-fuchs.com