Pepperl+Fuchs Switch Amplifier KFD2-SR2-Ex2.W K System Isolated Barrier
Pepperl+Fuchs Switch Amplifier KFD2-SR2-Ex2.W K System Isolated Barrier
· 2-channel isolated barrier
· 24 V DC supply (Power Rail)
· Dry contact or NAMUR inputs
· Relay contact output
· Line fault detection (LFD)
· Reversible mode of operation
· Up to SIL 2 acc. to IEC 61508
Pepperl+Fuchs Switch Amplifier KFD2-SR2-Ex2.W K System Isolated Barrier
The KFD2-SR2-EX2.W is a 2-channel isolated Switch Amplifier for intrinsic safety applications. It transfers digital signals (NAMUR sensors/mechanical contacts) from a hazardous area to a safe area. The proximity sensor or switch controls a form C changeover relay contact for the safe area load. The normal output state can be reversed using switches S1 and S2. Switch S3 is used to enable or disable line fault detection of the field circuit. During an error condition, the relays revert to their de-energized state and the LEDs indicate the fault according to NAMUR NE44. An unique collective error messaging feature is available when used with the power rail system.
· 24VDC Supply voltage
· Dry contact or NAMUR inputs
· Relay contact output
· Line fault detection (LFD)
· Reversible mode of operation
· Up to SIL2 according to IEC 61508
Specification of Pepperl+Fuchs Switch Amplifier KFD2-SR2-Ex2.W K System Isolated Barrier
| General specifications of Pepperl+Fuchs Switch Amplifier KFD2-SR2-Ex2.W K System Isolated Barrier | ||
|---|---|---|
| Signal type | Digital Input | |
| Functional safety related parameters | ||
| Safety Integrity Level (SIL) | SIL 2 | |
| Supply of Pepperl+Fuchs Switch Amplifier KFD2-SR2-Ex2.W K System Isolated Barrier | ||
| Connection | Power Rail or terminals 14+, 15- | |
| Rated voltage | 20 ... 30 V DC | |
| Ripple | ≤ 10 % | |
| Rated current | ≤ 50 mA | |
| Power dissipation | 1 W | |
| Power consumption | < 1.3 W | |
| Input of Pepperl+Fuchs Switch Amplifier KFD2-SR2-Ex2.W K System Isolated Barrier | ||
| Connection side | field side | |
| Connection | terminals 1+, 2+, 3-; 4+, 5+, 6- | |
| Rated values | acc. to EN 60947-5-6 (NAMUR) | |
| Open circuit voltage/short-circuit current | approx. 8 V DC / approx. 8 mA | |
| Switching point/switching hysteresis | 1.2 ... 2.1 mA / approx. 0.2 mA | |
| Line fault detection | breakage I ≤ 0.1 mA , short-circuit I > 6 mA | |
| Pulse/Pause ratio | min. 20 ms / min. 20 ms | |
| Output of Pepperl+Fuchs Switch Amplifier KFD2-SR2-Ex2.W K System Isolated Barrier | ||
| Connection side | control side | |
| Connection | output I: terminals 7, 8, 9 ; output II: terminals 10, 11, 12 | |
| Output I, II | signal, relay | |
| Contact loading | 253 V AC/2 A/cos φ > 0.7; 126.5 V AC/4 A/cos φ > 0.7; 40 V DC/2 A resistive load | |
| Minimum switch current | 2 mA / 24 V DC | |
| Energized/De-energized delay | approx. 20 ms / approx. 20 ms | |
| Mechanical life | 107 switching cycles | |
Function of Pepperl+Fuchs Switch Amplifier KFD2-SR2-Ex2.W K System Isolated Barrier
This isolated barrier is used for intrinsic safety applications. It transfers digital signals (NAMUR sensors/mechanical contacts) from a hazardous area to a safe area.
The proximity sensor or switch controls a form C changeover relay contact for the safe area load. The normal output state can be reversed using switches S1 and S2. Switch S3 is used to enable or disable line fault detection of the field circuit.
During an error condition, the relays revert to their deenergized state and the LEDs indicate the fault according to NAMUR NE44.
A unique collective error messaging feature is available when used with the Power Rail system.
Pepperl+Fuchs Switch Amplifier KFD2-SR2-Ex2.W K System Isolated Barrier
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