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SMART Transmitter Power Supply KFD2-STC5-1.2O – PEPPERL+FUCHS

  • 1-channel signal conditioner
  • 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 4 mA … 20 mA current sink/current source
  • Terminals with test points
  • Up to SIL 2 (SC 3) acc. to IEC/EN 61508

 

Details: KFD2-STC5-1.2O

Function

This signal conditioner provides the galvanic isolation between field circuits and control circuits. The device supplies 2-wire and 3-wire SMART transmitters, and can also be used with 2-wire SMART current sources. It transfers the analog input signal to the control side as two isolated output signals. Digital signals may be superimposed on the input signal on the field side or on the control side and are transferred bi-directionally. The device provides a sink mode or a source mode output on the control side terminals. The device has an internal resistor. Use this resistor if the HART communication resistance in the control circuit is too low. Test sockets for the connection of HART communicators are integrated into the terminals of the device.

 

Technical Data

General Specifications

Signal Type Analog Input

 

Functional safety related parameters

Signal Integrity Level (SIL) SIL2
Systematic Capability (SC) SC3

 

Supply

Connection Power Rail or Terminal 14+, 15-
Rated Voltage 18 ….. 30 V DC
Ripple Within the supply tolerance
Power Dissipation ≤ 1 W at maximum load
Power Consumption ≤ 1.7 W at maximum load

 

Input

Connection Size Field side
Connection Terminal 1+, 2-, 3
Input Signal 4 ….. 20 mA
Open Circuit voltage/short-circuit current Terminal 1+, 3:  23 V / 25mA
Input resistance Max. 205 Ω terminal 2-, 3, max. 330 Ω terminal 1+,3
Available Voltage ≥ 16 V at 20 mA ; ≥20 V at 4 mA, terminal 1+, 3

 

Output

Connection Size Control side
Connection Terminal 7+, 8-, 9-; 10+, 11-, 12-  (sink)

Terminal 7-, 8+, 9+; 10-, 11+, 12+  (source)

Load 0 ….. 600 Ω
Output Signal 4 ….. 20 mA (Overload > 25 mA )
Ripple Max. 50 µA
External Supply (loop) 2 …… 30 V DC

If the external voltage is > 19 V, a load ≥ ((V-19) / 0.02 Ω is required. V represents the value of the external voltage.

The internet 250 Ω resistor at terminals 9 and 12 can be used as a load.