KFD2-STC5-Ex1 SMART Transmitter Power Supply
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- 1-channel isolated barrier
- 24 V DC supply (power rail)
- Input 2-wire and 3-wire SMART transmitters and 2-wire SMART current sources
- Output 4 mA … 20 mA current sink/current source
- Terminals with test points
- Up to SIL 2 acc. to IEC/EN 61508
Description
Product Details
This isolated barrier is used for intrinsic safety applications.
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 safe area as an isolated current value.
Digital signals may be superimposed on the input signal in the hazardous or non-hazardous area and are transferred bi-directionally.
The device provides a sink mode or a source mode output on the safe area 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
| Safety Integrity Level (SIL) | SIL 2 |
Supply
| Connection | Power Rail or terminals 14+, 15- | |
| Rated voltage | Ur | 18 … 30 V DC |
| Ripple | within the supply tolerance | |
| Power dissipation | ≤ 1 W at maximum load | |
| Power consumption | ≤ 1.6 W at maximum load |
Input
| Connection side | field side | |
| Connection | terminals 1+, 2-, 3 | |
| Input signal | 4 … 20 mA | |
| Open circuit voltage/short-circuit current | terminals 1+, 3: 23 V / 25 mA | |
| Input resistance | max. 265 Ω terminals 2-, 3 , max. 330 Ω terminals 1+, 3 | |
| Available voltage | ≥ 16 V at 20 mA ; ≥ 20 V at 4 mA , terminals 1+, 3 |
Output
| Connection side | control side | |
| Connection |
terminals 7+, 8-, 9- (sink)
terminals 7-, 8+, 9+ (source) see additional information |
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| Load | 0 … 800 Ω | |
| Output signal | 4 … 20 mA (overload > 25 mA) | |
| Ripple | max. 50 µArms | |
| 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 internal 250 Ω resistor at terminal 9 can be used as a load. |
Transfer characteristics
| Deviation |
at 20 °C (68 °F), 4 … 20 mA
≤ 10 µA incl. calibration, linearity, hysteresis, loads and fluctuations of supply voltage |
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| 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) |
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| Settling time | 200 µs | ||||
| Rise time/fall time | 100 µs | ||||
Galvanic isolation
| Output/power supply | functional insulation, rated insulation voltage 50 V AC |
Indicators/settings
| Display elements | LED | |
| Labeling | space for labeling at the front |
Directive conformity
| Electromagnetic compatibility | |||||
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Conformity
| Electromagnetic compatibility |
NE 21:2012
EN 61326-3-2:2008 |
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| Degree of protection | IEC 60529:2001 | |
| Protection against electrical shock | UL 61010-1:2012 |
Ambient conditions
| Ambient temperature | -20 … 70 °C (-4 … 158 °F) |
Mechanical specifications
| Degree of protection | IP20 | |
| Connection | screw terminals | |
| Mass | approx. 150 g | |
| Dimensions | 20 x 124 x 115 mm (0.8 x 4.9 x 4.5 inch) (W x H x D), 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 | CML 17 ATEX 2029X | |||||||||||||||||||
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| Supply | ||||||||||||||||||||
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| Equipment | terminals 1+, 3- | |||||||||||||||||||
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| Equipment | terminals 2-, 3 | |||||||||||||||||||
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| Equipment | terminals 1+, 2 / 3- | |||||||||||||||||||
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| Certificate | CML 17 ATEX 3028X | |||||||||||||||||||
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| Galvanic isolation | ||||||||||||||||||||
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| Directive conformity | ||||||||||||||||||||
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International approvals
| UL approval | E106378 | |||||||
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| IECEx approval | ||||||||
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General information
| Supplementary information | Observe the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For information see www.pepperl-fuchs.com. |