1. General Introduction
The frequently occurring special case of rotational speed measurement has been paid particular attention in the development of the device. Thus indication and input can be either in Hz or in rpm. It is also possible, in applications involving slow processes, in which the signal sensors provide many pulses per revolution, to operate automatically with the actual rotational speed of the drive by specifying the number of pulses per revolution. The indication of the measured value is provided on a 4-digit, 7-segment LED display on the front of the device, with up to 3 places after the decimal point. The monitoring function is achieved on the basis of a limit value, whose upper and lower hysteresis value is freely selectable within the respective display range. The output signal is generated by a relay with a changeover contact, when the hysteresis limits are violated. Thanks to a high switching capability, the relay output can be used for the direct activation of an actuating element or as an input signal for a higher level control system. Also, the switching status of the relay is indicated by means of a yellow LED on the front of the device.Afunction block is connected in series with the relay, which 10 provides for various timer functions and thus obviates the requirement for the subsequent addition of a timer relay. In addition to the pull-in and drop-out delay, passing make contact and and pulse extension, the direction of operation of the relay, i. e. monitoring of speed fluctuation about a nominal value, can also be selected. The built-in start-up override, initiated when the power supply is switched on, or by an external signal, prevents error signals during the running up of the monitored system.
2. General Specification for KFU8-DW-1.D
Model | KFU8-DW-1.D |
General specifications | |
Signal type | Digital Input |
Functional safety related parameters | |
MTTFd | 100 a |
Supply | |
Rated voltage Ur | 200 ... 230 V AC ; 100 130 V AC; 50/60 Hz 20 VDC ... 30 VDC |
Fusing | external fusing 4 A |
Power consumption | AC: < 5 VA DC: < 5 W |
Input | |
Connection side | field side |
Input1 | |
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 |
Input frequency | 0.002 ... 10000 Hz, pulse length/duration: ≥20s |
Impedance | 1.2 k |
Input 2 | |
Switching point | high: 16 ... 30 V DC; max.10 mA due to integrated constant current sink; Ri ≅3 k low: 0 ... 6 V DC |
Input frequency | 0.002 ... 40000 Hz, pulse length/duration: ≥12s |
Connection | terminals 7+, 13- sensor supply terminals 14, 15 NPN/PNP input (galvanically isolated) |
Connectable sensor types | Two, three, or four-wire proximity switch, incremental rotary encoder, or externally generated pulses 16 ... 30 V |
Output | |
Connection side | control side |
Relay | 1 changeover contact |
Sensor supply | 24 V DC ± 10 %, 30 mA , short-circuit protected |
Contact loading | 250 V AC/2 A/ cos ≥0.7 40 V DC/2 A |
Delay | ≤20 ms (incl. calculation time) |
Mechanical life | ≥30.000.000 switching cycles |
Transfer characteristics | |
Changing interval | 5 ms (Internal processing time) |
Time delay before availability | ≤400 ms |
Measuring error | 0 ... 40000 Hz: ≤±0,10% Display: ±1 digit |
Timer function | ON-delay, OFF-delay, one shot, pulse extension |
Indicators/settings | |
Display elements | display , 4-digit, 7-segment red display, 7 mm digit height and LED |
LED indication | yellow LED : switching state |
Display indication | 0.002 ... 9999 Hz or 0,01 ... 9999 min- |
Control elements | Control panel |
Configuration | via operating buttons |
Labeling | space for labeling at the front |
Standard conformity | |
Electromagnetic compatibility | acc. to EN 50081-2 / EN 50082-2 |
Ambient condition | |
Ambient temperature | -25 ... 40 °C (-13 ... 104 °F) |
Storage temperature | -40 ... 85 °C (-40 ... 185 °F) |
Relative humidity | max. 80 %, not condensing |
Relative humidity | max. 80 %, not condensing |
Altitude | 0 ... 2000 m |
Operating conditions | The device has only to be used in an indoor area. |
3. Dimension
4.Electrical connection
