Speed Monitor KHU8-DW-1.D Technical description The KHU8-DW-1.D is a device used to indicate and monitor periodic signals which occur in almost all areas of automation and process engineering, i.e. frequencies in general and rotational speeds in particular. The input signals are evaluated using the cycle method, i.e. by measuring the duration of a period, and then converted by a very fast µ-controller to frequency, or rotational speed. The frequently occuring special case of rotational speed measurement was given particular attention. For this reason, indications and inputs can be either in Hz or in rpm. In addition, the possibility exists, on applications involving lengthy processes, whose sensors provide a number of pulses per revolution, to operate automatically with the actual rotational speed of the drive, by presetting the number of pulses. Indication of the measured value is achieved by means of a 4-digit 7-segment-LED-display on the front of the device, with up to 3 places following the decimal point. The monitoring function is actuated by a limiting value, whose upper and lower hysteresis values can be selected within the appropriate measuring and indicating range. The output signal is generated by a change-over relay when the hysteresis limits are either exceeded or fallen below. Due to its high switching capability, the relay output can be used to directly drive an actuator, or as an input signal to a higher level control. In addition, the switching state of the relay is indicated by a yellow LED on the front face of the device. A function block is connected in line with the output relay, which enables 10 different timer functions to be employed; thus there is no need to connect a separate timer relay in series. In addition to ON delay and OFF delay, defined ON time and pulse lengthening, the direction of operation of the relay, i.e. to monitor underspeed or overspeed, can also be selected. The built-in start-up bypass, triggered by switching on the supply voltage, or by an external signal, prevents false signals from occuring during the start-up of the monitored system. The speed monitor may be supplied with 115 VAC, 230 VAC or 24 VDC. When an alternating voltage is connected, a 24 VDC source is available for the signal transducer. All currently available two-, three- or four-wire proximity switches and incremental rotary encoders are accepatable as the sensor. Moreover two terminals are reserved for the connection of proximity switches to DIN 19234 (NAMUR). Connection diagram 3 2 External trigger signal 1 6 Power supply 230 VAC or Power supply 115VAC 4 or Power supply 24 VDC 16 34 NAMUR + NAMUR – Trigger input for start-up bypass Sensor power supply GND Sensor power supply 24 VDC 8 L+ L– L1 (230 V~) 17 L1 (115 V~) Input for NPN Output circuit Sensor power supply GND COM 11 NC 10 NO Subject to reasonable modifications due to technical advances. 9 8 8 13 L+ DC-3 wire sensor PNP DC-3 wire sensor NPN 13 L+ 13 L+ 15 14 L- 7 L- 15 14 DC-2 wire sensor DC-2 wire sensor 13 L+ 14 15 7 L- 7 Rotary encoder, Push-pull output stage 13 L+ Rotary encoder, Push-pull output stage 13 L+ TX TX yellow TX L- L- 18 N 9 L+ 7 Input for PNP Output circuit NAMUR Rotary encoder 9 Not connected 5 12 Relay output NAMUR Sensor Sensor power supply 24 VDC 15 7 14 L- 7 L- Copyright Pepperl+Fuchs, Printed in Germany Pepperl+Fuchs Group · Tel.: Germany (6 21) 7 76-11 11 · USA (3 30) 4 25 35 55 · Singapore 7 79 90 91 · Internet http://www.pepperl-fuchs.com Date of issue 12.11.1996 Bridge fitted: start-up bypass triggered by switching on the power supply. Speed Monitor KHU8-DW-1.D Technical data Supply voltages 230 VAC ± 10 %, 47 Hz ... 63 Hz, < 5 VA (Terminal 16, 18) 115 VAC ± 10 %, 47 Hz ... 63 Hz, < 5 VA Terminal 17, 18) 24 VDC +15/-10 %, uss ≤ 10 %, < 5 W (Terminal 4, 5) Signal inputs Frequency NAMUR 0.001 Hz ... 5000 Hz Minimum pulse length/duration: 20 µs Switch points: ≥1.2 mA; ≤ 2.1 mA (Terminal 8, 9) No load voltage: 8.2 V; Short circuit current: 6.5 mA Impedance: 1.2 kΩ PNP-sensor Switch point: 12 V (Terminal 15) Max. input voltage: 30 V Impedance: 2.8 kΩ NPN-sensor Switch point: 12 V (Terminal 14) Impedance: 3.3 kΩ Triggerinput Output relay Switch state indicator Timer functions Direction of operation Switch point: 12 V (Terminal 2) Max. input voltage: 30 V Impedance: 2.8 kΩ Terminal 10: NO;Terminal 11: NC; Terminal 12: COM 250 VAC, 2 A, cos ϕ ≥ 0.7 40 VDC, 2 A ON/OFF delay (incl. computation time) ≤ 20 ms Mechanical life ≥ 30 000 000 switch cycles 3 mm - yellow LED ON/OFF delay, defined ON time, pulse lengthening Timer period: 0 s ... 999.9 s reversible Sensor power supply Terminal 3, 13: L+; Terminal 1, 7: L24 VDC ± 10 %, U ss ≤ 10 %, 30 mA short circuit protected Start-up bypass Triggered by external signal (Terminal 2) or by switching on the supply voltage (Terminal 2 and Terminal 3 bridged) Bypass time: 0.1 s ... 999.9 s Error of measurement 0.001 Hz ... 100 Hz: ≤ 0.1 % 100 Hz ... 1 kHz: ≤ 0.3 % 1 kHz ... 5 kHz: ≤ 1.5 % Display: ± 1 digit Ready delay ≤ 400 ms Display rate of rotation and frequency 4-digit 7-segment-LED-display, red, digit height: 7 mm Design Modular terminal housing of Makrolon Mounting By clipping onto 35 mm standard rail according to DIN EN 50022 or srew mountable by pull-out clip with 90 mm grid Terminal connections Self-opening instrument terminals cross sectional area: ≤ 2 x 2.5 mm 2 Operating temperature Storage temperature -25 °C ... +70 °C -40 °C ... +85 °C Protection class EMC to IP 20 EN 50081-2, EN 50082-2 Date of issue 12.11.1996 4. Terminal allocation Term. Term. Term. Term. Term. Term. Term. Term. Term. 1:Sensor power supply, GND 2:Trigger input for start-up bypass 3:Sensor power supply, 24 VDC 4:Power supply, 24 VDC 5:Power supply, GND 6:Not connected 7:Sensor power supply, GND 8:NAMUR input L9:NAMUR input L+ Subject to reasonable modifications due to technical advances. Term. Term. Term. Term. Term. Term. Term. Term. Term. 10: Relay normally open contact, NO 11: Relay normally close contact, NC 12: Relay root, COM 13: Sensor power supply, 24 VDC 14: for NPN-sensor Input 15: for PNP-sensor Input 16: Power supply L1, 230 VAC 17: Power supply L1, 115 VAC 18: Power supply N Copyright Pepperl+Fuchs, Printed in Germany Pepperl+Fuchs Group · Tel.: Germany (6 21) 7 76-11 11 · USA (3 30) 4 25 35 55 · Singapore 7 79 90 91 · Internet http://www.pepperl-fuchs.com 35 Speed Monitor KHU8-DW-1.D Timer functions, reversal of direction of action of the output relay " No. Function 0 tStart-up 0 no timer function 1 0 1 1 ON delay 1 0 tRelay tRelay 1 2 2 OFF delay 0 t Relay tRelay 1 3 4 3 Defined ON time 4 Pulse lengthening 5 no timer function, inverted 5 6 ON delay, inverted 6 0 7 OFF delay, inverted t Relay tRelay tRelay tRelay tRelay 1 0 1 0 1 0 7 tRelay 1 0 tRelay t Relay 1 8 9 8 Defined ON time, inverted Pulse lengthening, inverted 9 0 tRelay tRelay tRelay tRelay 1 0 Dimensions, controls and indicators 115 40 Control keys Date of issue 12.11.1996 7-segment-display 92,5 Yellow LED, Relay switch state indication 36 Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany Pepperl+Fuchs Group · Tel.: Germany (6 21) 7 76-11 11 · USA (3 30) 4 25 35 55 · Singapore 7 79 90 91 · Internet http://www.pepperl-fuchs.com Speed Monitor KHU8-DW-1.D Function Description Operating mode Password protection not activated. Password may not be edited. X=0: frequency measurement 0.001 Hz...5000 Hz X=1: rotational speed measurement 0.01 r.p.m....9999 r.p.m. Preset at the factory: X=1 Number of pulses per revolution for rotational speed measurement (will be ignored for frequency measurement) 1 ≤ XXXX ≤ 1200 Preset at the factory: XXXX=1 Measuring and display range Frequency measurement: 0 ≤ X ≤ 3 Rotational speed measurement: 0 ≤ X ≤ 2 Preset at the factory: X=1 X 0000 000.1 00.02 0.003 Frequency range Rotational in Hz speed in rpm 0 ... 5000 0 ... 9999 0.0 ... 999.9 0.0 ... 99.99 0.0 ... 9.999 — Lower hysteresis limit of switching point 0 ≤ XXXX ≤ 9998 (depending on the measuring range) Preset at the factory: XXXX=1 Upper hysteresis limit of switching point 0.001 ≤ XXXX ≤ 9999 (depending on the measuring range) Preset at the factory: XXXX=2 Period for the timer function of switching relay 0.1 s ≤ XXX.X ≤ 999.9 s Preset at the factory: XXX.X=1.0 s Period for the timer function of switching relay Preset at the factory: X=1 X Function 0 1 2 3 4 5 6 7 8 9 No timer function ON delay OFF delay Defined ON time Pulse lengthening No timer function, inverted ON delay, inverted OFF delay, inverted Defined ON time, inverted Pulse lengthening, inverted Start-up bypass 0.1 s ≤ XXX.X ≤ 999.9 s Preset at the factory: XXX.X=3.0 s Display rate 0.01 s ≤ XX.X ≤ 2.5 s Preset at the factory: XX.X=0.33 s Date of issue 12.11.1996 The number of the software version can be read only. Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany Pepperl+Fuchs Group · Tel.: Germany (6 21) 7 76-11 11 · USA (3 30) 4 25 35 55 · Singapore 7 79 90 91 · Internet http://www.pepperl-fuchs.com 37