Pepperl Fuchs KFD2-STC4-Ex1.2O-Y1 SMART Transmitter Power Supply Output Current Sink 


 

Features of Pepperl Fuchs KFD2-STC4-Ex1.2O-Y1 SMART Transmitter Power Supply Output Current Sink 

• 1-channel isolated barrier
• 24 V DC supply (Power Rail)
• Input 2-wire and 3-wire SMART transmitters and 2-wire
SMART current sources
• Signal splitter (1 input and 2 outputs)
• Dual output 0/4 mA ... 20 mA, current sink
• Terminal blocks with test sockets
• Up to SIL3 acc. to IEC 61508

Function of Pepperl Fuchs KFD2-STC4-Ex1.2O-Y1 SMART Transmitter Power Supply Output Current Sink 

This isolated barrier is used for intrinsic safety applications.
The device supplies 2-wire and 3-wire SMART transmitters in a hazardous area, and can also be used with 2-wire SMART current sources.
It transfers the analog input signal to the safe area as two isolated current values.
Digital signals may be superimposed on the input signal in the hazardous or safe area and are transferred bi-directionally.
It is designed to provide a sink mode output on the safe area terminals.
If the HART communication resistance in the loop is too low,the internal resistance of 250 ohm between terminals 8, 9 and 11, 12 can be used.
Test sockets for the connection of HART communicators are integrated into the terminals of the device.

Application of Pepperl Fuchs KFD2-STC4-Ex1.2O-Y1 SMART Transmitter Power Supply Output Current Sink 
The device supports the following SMART protocols:
• HART    • BRAIN     • Foxboro

General specifications
Signal type Analog input
Functional safety related parameters
Safety Integrity Level (SIL) SIL 3
Supply
Connection Power Rail or terminals 14+, 15-
Rated voltage Ur 20 ... 35 V DC
Ripple within the supply tolerance
Power dissipation 1.8 W
Power consumption 2.4 W
Input
Connection side field side
Connection terminals 1+, 2-, 3 or 5-, 6+
Input signal 0/4 ... 20 mA
Open circuit voltage/short-circuit current terminals 1+, 3-: 22.7 V / 38 mA
Voltage drop terminals 5, 6 : ≤ 2.4 V at 20 mA
Input resistance terminals 2-, 3: ≤ 76 ohm
terminals 1+, 3: ≤ 500 ohm (250 ohm load)
Available voltage terminals 1+, 3: ≥ 16 V at 20 mA
Output
Connection side control side
Connection terminals 7+, 8-; 10+, 11-
Output signal 0/4 ... 20 mA (overload > 25 mA)
Ripple ≤ 50 µA rms
External supply (loop) 11 ... 30 V DC
Transfer characteristics
Deviation at 20 °C (68 °F), 0/4 ... 20 mA
≤ 10 µA incl. calibration, linearity, hysteresis, loads and fluctuations of supply voltage
Influence of ambient temperature 0.25 µA/K
Frequency range field side into the control side: bandwidth with 0.5 Vpp signal 0 ... 7.5 kHz (-3 dB)
control side into the field side: bandwidth with 0.5 Vpp signal 0.3 ... 7.5 kHz (-3 dB)
Settling time 200 µs
Rise time/fall time 20 µs
Galvanic isolation
Output/power supply functional insulation, rated insulation voltage 50 V AC
Output/Output functional insulation, rated insulation voltage 50 V AC
Indicators/settings
Display elements LED
Labeling space for labeling at the front
Directive conformity
Electromagnetic compatibility
Directive 2014/30/EU EN 61326-1:2013 (industrial locations)
Conformity
Electromagnetic compatibility NE 21:2011
Degree of protection IEC 60529:2001
Protection against electrical shock UL 61010-1:2012
Ambient conditions
Ambient temperature -20 ... 60 °C (-4 ... 140 °F)
Mechanical specifications
Degree of protection IP20
Connection screw terminals
Mass approx. 200 g
Dimensions 20 x 124 x 115 mm (0.8 x 4.9 x 4.5 inch) , housing type B2
Mounting on 35 mm DIN mounting rail acc. to EN 60715:2001
Data for application in connection
with hazardous areas
EU-Type Examination Certificate BAS 99 ATEX 7060 X
Marking ¬ II (1)G [Ex ia Ga] IIC , ¬ II (1)D [Ex ia Da] IIIC , ¬ I (M1) [Ex ia Ma] I
Input [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I
Supply
Maximum safe voltage Um 250 V (Attention! The rated voltage can be lower.)
Equipment terminals 1+, 3-
Voltage Uo 25.4 V
Current Io 86.8 mA
Power Po 551 mW