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Specification & Description
| Specification | Description |
|---|---|
| Part Number | KFD2-ST2-EX1.LB |
| Manufacturer | Pepperl + Fuchs |
| Signal Type | Digital Input |
| Supply Connection | Power Rail or terminals 14+, 15- |
| Rated Voltage | 20 ... 30 V DC |
| Ripple | ≤ 10 % |
| Rated Current | ≤ 50 mA |
| Input Connection | Terminals 1+, 2+, 3- |
| Open Circuit Voltage | Approx. 8 V DC |
| Short-Circuit Current | Approx. 8 mA |
| Switching Point/Hysteresis | 1.2 ... 2.1 mA / approx. 0.2 mA |
| Line Fault Detection | Breakage I ≤ 0.1 mA, short-circuit I > 6 mA |
| Output Connection | Output I: terminals 7+; Output II: terminals 9+ |
| Signal Level | 1-signal: (L+) - 3.5 V (100 mA, short-circuit protected), 0-signal: switched off (≤ 10 µA) |
| Output Type | Output I: signal, electronic output, active; Output II: signal or error message, electronic output, active |
| Switching Frequency | ≤ 5 kHz |
| Electrical Isolation | Input/Output: reinforced insulation according to IEC 62103, rated insulation voltage 300 Vrms |
| Ambient Temperature | -20 ... 60 °C |
| Degree of Protection | IP20 |
| Mass | Approx. 150 g |
| Dimensions | 20 x 119 x 115 mm |
| Mounting | On 35 mm DIN mounting rail according to EN 60715 |
| EC-Type Examination Certificate | PTB 00 ATEX 2035 |
| Group, Category, Type of Protection | ¬ II (1) G [Ex ia] IIC, ¬ II (1) D [Ex ia] IIIC |
| Approvals | FM, CSA, IECEx |
The Pepperl + Fuchs KFD2-ST2-EX1.LB is a high-performance isolated switch amplifier designed to facilitate the safe and reliable transfer of digital signals from hazardous areas to safe zones. This one-channel barrier is engineered to work with both dry contact and NAMUR sensor inputs, making it a versatile solution for a variety of industrial applications.
Equipped with an active transistor output, the KFD2-ST2-EX1.LB ensures active signal transmission to the safe area load. It also features an additional active fault output that can be utilised for enhanced monitoring and diagnostics. The device is capable of detecting line faults such as breakages or short circuits, and it provides clear indication of such faults through its LED indicators, in compliance with NAMUR NE44 standards.
The unit's mode of operation can be easily reversed, and it offers a switching frequency of up to 5 kHz, ensuring rapid signal processing for time-sensitive operations. The KFD2-ST2-EX1.LB also boasts reinforced insulation according to IEC 62103, with a rated insulation voltage of 300 Vrms, providing a robust barrier against electrical interference.
Designed for mounting on a 35 mm DIN rail, the device's compact dimensions and IP20 protection rating make it suitable for integration into a wide range of control panels and equipment housings. Its ambient operating temperature range of -20 to 60 °C ensures reliable performance even in challenging environmental conditions.
The KFD2-ST2-EX1.LB is also designed for use in conjunction with hazardous areas, holding an EC-Type Examination Certificate and conforming to the ATEX directive for intrinsic safety. This makes it an ideal choice for industries where explosive atmospheres may be present, such as in chemical processing, oil and gas, or pharmaceutical manufacturing.
Overall, the Pepperl + Fuchs KFD2-ST2-EX1.LB is a robust and reliable component for ensuring safe signal transmission in industrial environments, offering both flexibility and peace of mind for engineers and technicians.
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Frequently Asked Questions
What type of input signals does the switch amplifier support?
The switch amplifier supports digital input signals, specifically from dry contact or NAMUR sensors, which are commonly used in hazardous areas for intrinsic safety applications.
Can the switch amplifier be installed in a Zone 2 hazardous area?
Yes, the device is suitable for installation in Zone 2 hazardous areas, providing a safe and reliable solution for signal transfer from these environments.
Is there a way to reverse the normal output state of the switch amplifier?
Indeed, the normal output state can be reversed using the switch S1 provided on the device, allowing for flexible operation according to the needs of the application.
Does the switch amplifier have line fault detection capabilities?
The switch amplifier is equipped with Line Fault Detection (LFD) which monitors the control circuits for lead breakage and short circuits, enhancing the safety and reliability of the system.
What is the function of output II on the switch amplifier?
Output II on the switch amplifier can be configured either as a signal output or as an error message output, depending on the position of switch S2, allowing for versatile signalling options.
How does the switch amplifier indicate an error condition?
In the event of an error condition, the transistors revert to their de-energized state and the fault is indicated by LEDs in accordance with NAMUR NE44 standards.
What is the significance of the Power Rail system with this switch amplifier?
The Power Rail system is used to supply power to the switch amplifier and also enables a unique collective error messaging feature, which can be transmitted to a power feed module.
What are the ambient temperature limits for operating the switch amplifier?
The switch amplifier is designed to operate within an ambient temperature range of -20 to 60°C, making it suitable for a variety of industrial environments.
What type of electrical isolation is provided by the switch amplifier?
The switch amplifier offers reinforced insulation according to IEC 62103 between the input and output, as well as between the input and power supply, with a rated insulation voltage of 300 Vrms.
Can the switch amplifier be used in applications up to SIL2 according to IEC 61508?
Yes, the switch amplifier is suitable for use in applications up to Safety Integrity Level 2 (SIL2) as per the IEC 61508 standard, which relates to the functional safety of electrical/electronic/programmable electronic safety-related systems.
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