VEGA KFD2-SR2-Ex2.W User Manual

Isolated switch amplifiers	KFD2-SR2-Ex2.W
	Output: relay

24 V DC

•2-channel

•Control circuit EEx ia IIC

•Reversible mode of operation

•1 signal output with 1 changeover contact per channel

•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- Ex2.W, an LB/SC collective error message is in addition transferred through the Power Rail to the power feed module. The intrinsically safe inputs per DIN EN 50020 are safely isolated from the output and the power supply. Relay outputs are galvanically separated from the mains power in accordance with IEC 61140. Relay outputs are galvanically separated from each other in accordance with

IEC 61140.

Input I EEx ia IIC				Input II EEx ia IIC
1+	3-			4+		6-
400 Ω ≤ R ≤ 2 kΩ					400 Ω ≤ R ≤ 2 kΩ
10 kΩ	3-			4+	10 kΩ	6-
1+
without SC	10 kΩ				5+	10 kΩ
2+	3-					6-
without
LB, SC 1+	3-			4+		6-
1+ 2+	3-			4+ 5+		6-
	LB					LB
	SC					SC
I	II		S3		I	II	S3
		red
S1				S2		red
	&					&
						green
yellow					yellow
	7	8	9			10 11 12
	Output I					Output II

Composition

Subject to reasonable modifications due to technical advances.

Switch S3 in position I

Switch S3 in position I

Switch S3 in position I

zone Hazardouszone0, area,1

Switch S3 in position II

		area
+ -	1	Safe

+-

14 15

Power Power LB/SC supply Rail collective

error message

only KFD2-SR2-Ex2.W

103368_ENG.xml 2003-06-03

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