Pepperl Fuchs KFA6-SR-2.3L.FA Data Sheet

Switch Amplifier

KFA6-SR-2.3L.FA

Features

• 2-channel

• 115/230 V AC supply

• 3-wire PNP/NPN sensor or push-pull input

• Relay contact output

• DIP switch selectable functions

• Minimum/maximum control

• Up to SIL 2 acc. to IEC 61508

Function

This signal conditioner provides the galvanic isolation
between field circuits and control circuits.

The device transfers the status of 2-wire and 3-wire sensors to
the relay contact output.

The device has 2 inputs and 2 relay contact outputs.

The device can be used either as dual channel signal
conditioner or as a two-point level controller.

The device is easily configured by the use of DIP switches.

A fault is signalized by LEDs.

Assembly

Front view

LED yellow:
Relay output I

LED yellow:
Relay output II

Switch S1:
(mode of operation
input I)

Switch S2:
(mode of operation
input II)

1
4

KFA6-SR-2.3L

OUT1 OUT2 PWR

S1
S2

S3
S4
S5

13 15

Removable terminals
green

3

2
5

6

LED green:
Power supply

Switch S3:
(dual channel or min/max)

III

Switch S4:
(sensor type input I)

Switch S5:

9107

8

12

11
14

(sensor type input II)

Removable terminals
green

Connection

2

KFA6-SR-2.3L

1+

I

2
3-

4+

II

5
6-

10
11
12

7

I

8
9

II

Release date 2018-05-14 15:04 Date of issue 2018-05-14 182509_eng.xml

Refer to "General Notes Relating to Pepperl+Fuchs Product Information".

USA: [phone] Germany: [phone]

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14+
15-

230 V AC

1

Technical data KFA6-SR-2.3L.FA

General specifications

Signal type Digital Input

Functional safety related parameters

Safety Integrity Level (SIL) SIL 2

Supply

Connection terminals 14, 15

Rated voltage U

Rated current I

r

Power dissipation 2.5 W

Power consumption ≤ 7 W

Input

Connection side field side

Connection Input I: terminals 1+, 2, 3-; Input II: terminals 4+, 5, 6-

Rated values 22 ... 24 V DC / 100 mA, see notes

NPN sensor

Switching point 4 ... 13 V

PNP sensor

Switching point 4 ... 13 V

Short-circuit current 110 mA

Switching point 0-signal: < 5 V

Output

Connection side control side

Connection output I: terminals 7, 8, 9

Output I, II

Contact loading 250 V AC / 4 A / cos φ > 0.7; 40 V DC / 2 A resistive load

Energized/De-energized delay max. 6 ms

Mechanical life 107 switching cycles

Transfer characteristics

Switching frequency ≤ 10 Hz

Galvanic isolation

Input/Output safe galvanic isolation per EN 50178, voltage peak value 253 V

Input/power supply safe galvanic isolation per EN 50178, voltage peak value 253 V

Output/power supply safe galvanic isolation per EN 50178, voltage peak value 253 V

Output/Output basic insulation acc. to EN 50178, rated insulation voltage 253 V

Indicators/settings

Display elements LEDs

Labeling space for labeling at the front

Directive conformity

Electromagnetic compatibility

Directive 2004/108/EC EN 61326-1:2006

Low voltage

Directive 2006/95/EC EN 50178:1997

Conformity

Galvanic isolation EN 50178

Electromagnetic compatibility NE 21

Degree of protection IEC 60529

Ambient conditions

Ambient temperature -20 ... 60 °C (-4 ... 140 °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)

General information

Supplementary information Observe the certificates, declarations of conformity, instruction manuals, and manuals where applicable. For

90 ... 253 V AC , 45 ... 65 Hz

r

≤ 150 mA

1-signal: > 13 V

output II: terminals 10, 11, 12

information see

eff

Release date 2018-05-14 15:04 Date of issue 2018-05-14 182509_eng.xml

Refer to "General Notes Relating to Pepperl+Fuchs Product Information".

USA: [phone] Germany: [phone]

[e-mail] [e-mail] [e-mail]

2

Technical data KFA6-SR-2.3L.FA

Notes

Function

The device has two inputs and two relay outputs (change-over contact) and is usable either as dual channel isolated amplifier or
as two-point control (min/max control).
The inputs are designed in a way, that the signals of sensors which have PNP or NPN output transistors as well as push-pull
outputs, can be processed. In the case of sensors with push-pull outputs the switches S4 or S5 have to be set to position I. For
sensors with PNP or NPN output transistors, the switches S4 or S5 have to be set to position II. The operating behaviour of the
sensor can be selected: NO S1/S2 in position I; NC S1/S2 in position II.

Dual channel switching amplifier for binary sensors or contacts

With this function (S3 in position I) contact or sensor signals from the input are transmitted to the relay output.

Parallel operation (1 input, 2 outputs)
A signal duplication can be realized by the following measures:

• Jumper terminal 2 to terminal 5.

• One sensor to input I or II.

Two-point control (min/max control) with storage of status

On this setting (S3 in position II) the information from the two inputs is combined.
When the supply voltage is switched on, relay 1 is energised until input 2 is activated (reset input). Input 1 works as an set input.

Truth table (min/max control)

Conditions Inputs Outputs

E I E II

Activation of the supply voltage not activated not activated relay energised

activated not activated relay energised

activated activated relay de-energised

Normal operation activated transition:

transition:
activated/not activated

not activated/activated

not activated relay energising

relay I and II

relay de-energising

Sensor connection

NPN output stage/contact

S4 = II

PNP output stage/contact

S4 = II S5 = II

Push-pull output stage

S4 = I S5 = I

2 3-

1+

1+

2

S5 = II

2

3-

5 6-

4+

4+

5

5

6-

Function of the DIP switches

Function Switch function Switch/position

Operating behaviour of the sensor input input 1 is activated if sensor 1 is closed S1/I

input 1 is activated if sensor 1 is open S1/II

input 2 is activated if sensor 2 is closed S2/I

input 2 is activated if sensor 2 is open S2/II

Dual channel or min/max dual channel independent S3/I

min/max function with storage of the status S3/II

Sensor type input 1: push-pull output stage, NO S4/I

input 1: PNP/NPN, NO S4/II

input 2: push-pull output stage, NO S5/I

input 2: PNP/NPN, NO S5/II

Release date 2018-05-14 15:04 Date of issue 2018-05-14 182509_eng.xml

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3

Technical data KFA6-SR-2.3L.FA

Example 1: filling of a vessel (two-point level control, S3 in position II)

Min contact or min sensor is connected to input 1 (set), max contact or max sensor is connected to input 2 (reset). Dip switch S1
and S2 are on position I. A filling pump is connected to output 1 or 2 (terminals 7/8 or 10/11).

All data refer to NO sensors.

Pump

Max

Input II

Min

Input I

with vibration limit switch

S1
S2
S3
S4
S5

I II

When the supply voltage of the KFA6-SR-2.3L is switched on, the pump will also switched on as long as the Max contact is not
activated. During operation the pump is switched off as soon as the level has reached max position. If the level reach min position,
the pump is switched on. If the KFA6-SR-2.3L has no power supply, the pump is switched off.

Example 2: emptying of a vessel (two-point level control, S3 in position II)

Max contact or max sensor is connected to input 1 (set), min contact or min sensor is connected to input 2 (reset). Dip switch S1
and S2 are set to position I. An emptying pump is connected to output 1 or 2 (terminals 7/9 or 10/12).

All data refer to NO sensors.

Max

Min

Input I

Input II

S1
S2
S3
S4
S5

I II

Pump

with vibration limit switch

When the supply voltage of the KFA6-SR-2.3L is switched on, the pump will also switched on, if max contact is activated. During
operation the pump is switched off as soon as the level has reached min position. If the level reach max position, the pump
switched on. If the KFA6-SR-2.3L has no power supply, the pump is switched on.

Comments:

1. NO with push-pull output stage means that the closing contact or transistor is connected to terminal 2 and 3 (5 and 6).
NC with push-pull output stage means that the opening contact or transistor is connected to terminal 2 and 3 (5 and 6).

2. In dip switch position S3/I (dual channel, independent) an output relay is activated if the corresponding input is activated.

Release date 2018-05-14 15:04 Date of issue 2018-05-14 182509_eng.xml

Refer to "General Notes Relating to Pepperl+Fuchs Product Information".

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4

Technical data KFA6-SR-2.3L.FA

Derating of the sensor currents in dependence of the ambient temperature

The maximum value of the sensor currents is controlled by a thermal overload protection of the device.

The device determines its ambient temperature and limits the sensor currents accordingly (see
figure). An inadmissibly high ambient temperature can limit the function of the sensors.

Attention

200

180

160

140

120

100

Total current in mA

80

60

40

20

Maximum value for
operation with 2 sensors

Maximum value for
operation with 1 sensor

10 20 30 40 50 60

Attention!

The maximum current per
sensor amounts to 100 mA .

Ambient temperature in °C

Release date 2018-05-14 15:04 Date of issue 2018-05-14 182509_eng.xml

Refer to "General Notes Relating to Pepperl+Fuchs Product Information".

USA: [phone] Germany: [phone]

[e-mail] [e-mail] [e-mail]

5