Please note: All product-related documents, such as certificates, declarations of conformity, etc., which were issued prior to the conversion under the name Pepperl+Fuchs GmbH or Pepperl+Fuchs AG, also apply to Pepperl+Fuchs SE.
Download the complete datasheet as a PDF:
|Frequency voltage current converter
40 kHz version
|Functional safety related parameters|
|Rated voltage||200 ... 230 V AC ; 100 … 130 V AC; 50 Hz
20 VDC ... 30 VDC
|Fusing||external fusing 4 A|
|Power consumption||AC: < 5 VA
DC: < 5 W
|Type||4-digit, 7-segment red display, 7 mm digit height|
|Display interval||0.002 ... 9999 Hz or
0.01 ... 9999 min-1
|Parameter assignment||keypad-driven menu|
|Connection||terminals 8-, 9+|
|Connectable sensor types||NAMUR sensors according to DIN EN 60947-5-6|
|Open loop voltage||8.2 V DC|
|Short-circuit current||6.5 mA|
|Switching point||1.2 ... 2.1 mA Switching hysteresis approx. 0.2 mA|
|Switching point||high: 16 ... 30 V DC; max.10 mA; Ri ≅ 3 kOhm
low: 0 ... 6 V DC
|Connection||terminals 7+, 13- sensor supply
terminals 14, 15 NPN/PNP input (galvanically isolated)
|Connectable sensor types||2-, 3-, or 4-wire proximity switches and incremental rotary encoder|
|Sensor supply||19 ... 28 V DC non-stabilised; ≤ 30 mA short-circuit protected|
|Analog voltage output||0 ... 10 V DC; 2 ... 10 V DC; 30 mA max.; resolution: 12 mV; Ri ≥ 330 Ω (terminal 5+, 6-)|
|Analog current output||0 ... 20 mA; 4 ... 20 mA; resolution: 25 µA; Ri ≤ 600 Ω (terminal 4-, 5+)|
|Digital incrementing||≥ (Ub -3 V), 20 mA, short-circuit proof (Terminals 1-, 2+)
with frequency division Fin /1 ... Fin /9999
|Input frequency||≤ 40000 Hz, pulse pause/pulse length: ≥ 12 µs|
|Deviation||≤ 0.2 % of full-scale value|
|Changing interval||5 ms (Internal processing time)|
|Electromagnetic compatibility||acc. to EN 50081-2 / EN 50082-2|
|Ambient temperature||-25 ... 40 °C (-13 ... 104 °F)|
|Storage temperature||-40 ... 85 °C (-40 ... 185 °F)|
|Relative humidity||max. 80 %, not condensing|
|Altitude||0 ... 2000 m|
|Operating conditions||The device has only to be used in an indoor area.|
|Connection assembly||Caution: Please be aware that the device may only be connected to a switchable power supply. The switch or circuit breaker must be easy to reach and identified as the separator for the device.|
|Degree of protection||IP20|
|Connection||coded, removable terminals , max. core cross section 0.34 ... 2.5 mm2|
|Construction type||modular terminal housing in Makrolon, System KF
For use in the switch cabinet/switch cabinet module
|Mounting||snap-on to 35 mm standard rail or screw fixing|
|Manuals||Language||File Type||File Size|
|Manual KFU8-FSSP-1.D||ENG||1041 KB|
|Handbuch KFU8-FSSP-1.D||GER||1067 KB|
|Statements of compliance||Certificate No.||File Type||File Size|
|EU-Declaration of conformity / EU-Konformitätserklärung||DOC-1838B||162 KB|
|Canada, USA CSA cUL||2137693||76 KB|
The KFU8-FSSP-1.D frequency-voltage/current converter is a device for displaying and monitoring periodic signals, which occur in almost all areas of the automation and processing industry, i.e. frequencies in general and rotational speeds in particular.
Input pulses are evaluated according to the cycle method, i.e. by measurement of the periodicity, and are converted into a frequency or rotational speed by a μ controller. Depending on the measurement range value selected, the μ controller calculates a voltage or current value proportionate to the input frequency and exports this value via a digital-analog converter.
The following analogue signals are available for selection: 0 V ... 10 V, 2 V ... 10 V, 0 mA ... 20 mA, 4 mA ... 20 mA
The serially switched output provides the input frequency which can be subdivided by the adjustable factor (1 ... 9999).
Special consideration was given to the frequently occurring special case of rotational speed measurement during the development of the device. This makes it possible for the display and inputs to be either Hz or in min -1.
In addition, in applications with signal encoders that return multiple pulses per revolution, it is possible to operate automatically at the actual speed of the drive by assigning the number (1 ... 1200).
The frequency/voltage/current converter is supplied with 115 VAC, 230 VAC or 24 VDC. When it is connected with alternating voltage it provides an unstabilised 24-VDC source of power for the signal encoder.
All commonly available two- three- or four-wire proximity switches and incremental encoders on the input galvanically separated by an optical coupler are accepted as a signal source. In addition, two terminals are reserved for connecting proximity switches or incremental encoders in accordance with DIN 19234 (NAMUR).
The input signal frequency in Hz or the speed in min -1 - or the output signal voltage in V or current in mA - appears in a 4-place 7-segment LED display on the front of the device. Parameters can be set with 4 buttons underneath the display.