34 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.pep perl-fuchs.com sensor power supply 24 vdc trigger input for start-up bypass sensor power supply gnd not connected l+ lC l1 (230 v~) n l1 (115 v~) nc no 9 8 13 15 14 7 3 2 1 6 4 5 bridge fitted: start-up bypass triggered by switching on the power supply. external trigger signal power supply 24 vdc or power supply 230 vac or power supply 115vac relay output 16 18 17 12 11 10 l + l - l + l - l + l - l + t x l + l - t x t x l + t x t x l - l + l - l - com namur + namur C sensor power supply 24 vdc input for pnp output circuit input for npn output circuit sensor power supply gnd y t y t y t yellow namur sensor dc-2 wire sensor dc-3 wire sensor pnp dc-3 wire sensor npn rotary encoder, push-pull output stage 13 15 7 9 8 dc-2 wire sensor 13 15 7 13 14 7 14 7 13 14 7 9 8 13 15 rotary encoder, push-pull output stage 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 m -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 namur rotary encoder speed monitor khu8-dw-1.d date of issue 12.11.1996
35 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.pep perl-fuchs.com 4. terminal allocation term. 1:sensor power supply, gnd term. 2:trigger input for start-up bypass term. 3:sensor power supply, 24 vdc term. 4:power supply, 24 vdc term. 5:power supply, gnd term. 6:not connected term. 7:sensor power supply, gnd term. 8:namur input l- term. 9:namur input l+ term. 10: relay normally open contact, no term. 11: relay normally close contact, nc term. 12: relay root, com term. 13: sensor power supply, 24 vdc term. 14: for npn-sensor input term. 15: for pnp-sensor input term. 16: power supply l1, 230 vac term. 17: power supply l1, 115 vac term. 18: power supply n speed monitor khu8-dw-1.d date of issue 12.11.1996 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 %, u ss 10 %, < 5 w (terminal 4, 5) signal inputs frequency 0.001 hz ... 5000 hz minimum pulse length/duration: 20 m s namur switch points: 3 1.2 ma; 2.1 ma (terminal 8, 9) no load voltage: 8.2 v; short circuit current: 6.5 ma impedance: 1.2 k w pnp-sensor switch point: 12 v (terminal 15) max. input voltage: 30 v impedance: 2.8 k w npn-sensor switch point: 12 v (terminal 14) impedance: 3.3 k w triggerinput switch point: 12 v (terminal 2) max. input voltage: 30 v impedance: 2.8 k w output relay terminal 10: no;terminal 11: nc; terminal 12: com 250 vac, 2 a, cos j 3 0.7 40 vdc, 2 a on/off delay (incl. computation time) 20 ms mechanical life 3 30 000 000 switch cycles switch state indicator 3 mm - yellow led timer functions on/off delay, defined on time, pulse lengthening timer period: 0 s ... 999.9 s direction of operation reversible sensor power supply terminal 3, 13: l+; terminal 1, 7: l- 24 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 -25 c ... +70 c storage temperature -40 c ... +85 c protection class ip 20 emc to en 50081-2, en 50082-2
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.pep perl-fuchs.com speed monitor khu8-dw-1.d date of issue 12.11.1996 timer functions, reversal of direction of action of the output relay 9 1 0 8 1 0 1 0 7 1 0 6 1 0 5 1 0 4 3 1 0 2 1 0 1 1 0 0 " t start-up t relay t relay t relay t relay t relay t relay t relay t relay t relay t relay t relay t relay t relay t relay t relay t relay 1 0 7-segment-display yellow led, relay switch state indication control keys dimensions, controls and indicators no. function 0 no timer function 1 on delay 2 off delay 3 defined on time 4 pulse lengthening 5 no timer function, inverted 6 on delay, inverted 7 off delay, inverted 8 defined on time, inverted 9 pulse lengthening, inverted 40 115 92,5
37 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.pep perl-fuchs.com speed monitor khu8-dw-1.d date of issue 12.11.1996 password protection not activated. password may not be edited. 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 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 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 operating mode x frequency range rotational in hz speed in rpm 0000 0 ... 5000 0 ... 9999 000.1 0.0 ... 999.9 00.02 0.0 ... 99.99 0.003 0.0 ... 9.999 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 no timer function 1 on delay 2 off delay 3 defined on time 4 pulse lengthening 5 no timer function, inverted 6 on delay, inverted 7 off delay, inverted 8 defined on time, inverted 9 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 the number of the software version can be read only. function description
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