Pepperl+Fuches KFD2-SRA-Ex4 Switch Amplifier, 4-channel isolated barrier, 24 V DC supply (Power Rail), dry contact or NAMUR inputs.
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.
Each sensor or switch controls one form A normally open relay contact for the safe area load. A special 2:1 wiresaving technology is available on this isolator, reducing field wiring by 50 %.
Switch S1 is used to enable or disable line fault detection of the field circuit. The 2:1 mode is selected with switch S2 while the remaining switches,
S3 ... S6, are used for reversing the normal output state of the relays.
A unique collective error messaging feature is available when used with the Power Rail system.
Technical Data
General specifications
Signal type Digital Input
Supply
Connection Power Rail or terminals 14+, 15-
Rated voltage Ur 19 ... 30 V DC
Ripple ā¤ 10 %
Rated current Ir 45 ... 70 mA
Power dissipation 1.2 W
Input
Connection side field side
Connection terminals 1-, 2+, 3-; 4-, 5+, 6-
Rated values acc. to EN 60947-5-6 (NAMUR), see manual for electrical data
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
Pulse/Pause ratio min. 35 ms / min. 35 ms (non-AC operation) min. 70 ms / min. 70 ms (AC operation)
Line fault detection breakage I ā¤ 0.15 mA , short-circuit I > 6 mA
Output
Connection side control side
Connection output I: terminals 7, 8 ; output II: terminals 8, 9 ; output III: terminals 10, 11 ; output IV:
terminals 11, 12
Output I ... IV Signal I ... Signal IV ; relay
Contact loading 253 V AC/2 A /cos Ļ > 0.7; 40 V DC/2 A resistive load;
Energized/De-energized delay approx. 30 ms / approx. 30 ms
Mechanical life 5 x 106 switching cycles
Collective error message Power Rail
Transfer characteristics
Switching frequency ā¤ 10 Hz (non-AC operation) ā¤ 3 Hz (AC operation)
Galvanic isolation
Input/Output reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 Veff
Input/power supply reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 Veff
Output/power supply reinforced insulation according to IEC/EN 61010-1, rated insulation voltage 300 Veff
Output/Output basic insulation according to IEC/EN 61010-1, rated insulation voltage 300 Veff
Indicators/settings
Display elements LEDs
Control elements DIP switch
Configuration via DIP switches
Labeling space for labeling at the front
Directive conformity
Electromagnetic compatibility
Directive 2014/30/EU EN 61326-1:2013 (industrial locations)
Low voltage
Directive 2014/35/EU EN 61010-1:2010
Conformity
Electromagnetic compatibility NE 21:2006
Degree of protection IEC 60529:2001
Input EN 60947-5-6:2000
Ambient conditions
Ambient temperature -20 ... 60 Ā°C (-4 ... 140 Ā°F)
Mechanical specifications
Degree of protection IP20
Connection screw terminals
Mass approx. 150 g
Dimensions 20 x 119 x 115 mm (0.8 x 4.7 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 ZELM 99 ATEX 0009
Marking 1 II (1)G [Ex ia Ga] IIC
1 II (1)D [Ex ia Da] IIIC
1 I (M1) [Ex ia Ma] I
Input Ex ia IIC
Voltage Uo 10 V
Current Io 14 mA
Power Po 35 mW (linear characteristic)
Supply
Maximum safe voltage Um 40 V DC (Attention! Um is no rated voltage.)
Output
Contact loading 230 V AC + 10 % / 2 A / 100 VA / cos Ļ ā„ 0.7; 40 V DC / 2 A resistive load
Fault indication output
Maximum safe voltage Um 40 V DC
Galvanic isolation
Input/input not available
Input/Output safe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V
Input/power supply safe electrical isolation acc. to IEC/EN 60079-11, voltage peak value 375 V
Directive conformity
Directive 2014/34/EU EN 60079-0:2012+A11:2013 , EN 60079-11:2012 , EN 60079-26:2007 , EN
50303:2000
International approvals
UL approval
Control drawing 116-0145
IECEx approval
IECEx certificate IECEx TUN 04.0003
IECEx marking [Ex ia Ga] IIC, [Ex ia Da] IIIC, [Ex ia Ma] I
