OVERVIEW

Official designation: Pepperl+Fuchs KFD2-ST2-Ex2 (K-System, Switch Amplifier)

Role/Application: This transformer-isolated barrier transmits two channels of digital signals from hazardous to safe areas, supporting NAMUR sensors and mechanical contacts, and featuring line fault detection.

KEY SPECS SUMMARY

Power: 20 to 30 V DC (Nominal 24 V DC)

Interfaces / Ports: Two input channels, two active transistor outputs

Indicators: Four LEDs (Power, Status Channel I, LB/SC Channel I, Status Channel II, LB/SC Channel II)

Operating Temp: -20 to 60 degrees C

Platform / Compatibility: Dry contacts or NAMUR inputs, DIN rail mounting

Limit: SIL 2 per IEC 61508, Maximum current 100 mA per output

Lifecycle: Discontinued, available while stocks last

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the rated supply voltage and maximum current draw?

A: Rated supply voltage is 20 to 30 V DC with a rated current draw of 50 mA.

Wiring & Installation:

Q: How is the line fault detection feature configured?

A: Line fault detection is configured using the DIP switch S3 on the front of the unit.

Troubleshooting & Compatibility:

Q: What do the red and yellow LEDs indicate on the front panel?

A: Yellow LEDs indicate output status, and red LEDs indicate line breakage or short circuit (LB/SC).

Replacement & Upgrades:

Q: Is this module subject to obsolescence and what is the general recommendation?

A: The KFD2-ST2-Ex2 is discontinued; refer to the latest manufacturer manual for alternative models.