Kiepe JMNC Electronic Speed Monitoring

Kiepe JMNC Electronic Speed Monitoring\r\n\r\na p p l i c a t i o n\r\n\r\nThe Electronic Speed Monitor relays JMNC is used in connection\r\nwith a pulse sensor to monitor the rotational speed and standstill\r\nof drives.\r\nPulse sensors according to NAMUR-EN 50227 as well as optoelectronic\r\npulse transducers (Kiepe model EOG) can be connected\r\nto the speed monitor relay.\r\nThe pulse output is fed to the speed monitor relay where the\r\npulse frequency is compared with the frequency set by the control\r\nof the relay. When the input frequency passes the set frequency\r\nthe internal output relay is switched.\r\nWarning or control equipment can be connected to this output\r\nrelay and operate when the speed either increases or decreases\r\nfrom the setpoint. The output relay contacts of JMNC are\r\ngoldplated to improve true contact even in case of low voltage\r\ncircuit operations.\r\nThe operation of the relay can be inhibited during start-up of the\r\nmonitored drive by adjusting the start-up potentiometer to the\r\ntime taken for the drive to reach operating speed.\r\nThe device is intended for use in stationary installations\r\nand in vehicles.\r\n\r\nc o n s t r u c t i o n\r\n\r\nThe control unit JMNC is made of 2 parts. One forms the base\r\nand contains a combined edge connector and terminal block, five\r\nrubber inserts on three sides for cable entries and two knockout\r\nholes in the base are provided for mounting the control unit. The\r\nother and main component of the control unit is a printed circuit\r\nboard which slides into the plastic case and is held in place by a\r\nplastic plate which clips into the openside.\r\nThe complete plug-in unit is secured to the base by two screws\r\nheld captive by rubber washers. This arrangement allows\r\nwithdrawal of the plug-in unit from the base without having to\r\nloosen the wiring on the terminal block.\r\n\r\nOption\r\n\r\nA special design is available to meet requirements where the\r\nspeed monitor unit should be installed close to the monitored\r\ndrive and its pulse sensor.\r\nThe design consists of speed monitor relay JMNC being installed\r\nin a plastic housing, of IP 65 protection, and already wired to a\r\nterminal block.\r\nThe true operation of the device can readily be observed through\r\nthe transparent cover of the plastic housing.\r\nThe features of this arrangement are:\r\n- Shortened length of screened cable between pulse sensor and\r\nrelay adjustment at commissioning with visual contact to the\r\ndrive.\r\n- The output signal of the relay can be interference free\r\ntransmitted to the control equipment without using the\r\nscreened cable.\r\n\r\no p e r a t i n g p r i n c i p l e\r\n\r\nThe circuit arrangement of the speed monitor relay JMNC makes\r\nuse of the advantages of digital pulse input. There are no time\r\nlags normally encountered with analog devices. The unit\r\ncompares the time between successive input pulses and its preset\r\nfrequency.\r\nDifferences result in immediate switch-off of the output relay.\r\nThe output relay will switch, too, if the connected pulse sensor\r\nbecomes damaged or the power supply fails.\r\n\r\ns e t t i n g c o n t r o l s\r\n\r\nStart-up delay potentiometer\r\nOperation of the relay can be inhibited during start-up by\r\nadjusting the potentiometer over the range of 0 to 7 45 sec.\r\ndepending on the time taken for the monitored drive to reach\r\noperating speed.\r\nPulse range selector switch\r\nThe trip point can be adjusted within the range of 8 - 12000\r\npulses per minute. This total range is devided into 3 continously\r\nadjustable setting ranges.-\r\nPlease note: The indication beside the pulse range selector switch\r\nsignifies pulses / min. and not r.p.m..\r\nPushbutton\r\nPressing of the pushbutton links the output relay during the\r\nadjustment of the trip point and prevents the drive from\r\nbecoming cut-off during the adjustment.\r\nSetpoint potentiometer, Coarse\r\nprovides coarse trip point adjustment.\r\nSetpoint potentiometer, Fine\r\nprovides fine adjustment of trip point within the range of 10 % of\r\nset coarse adjustment.\r\nLE D-diode, green\r\nindicates state of output relay\r\nLED „lit“ means operating speed above setpoint,\r\noutput relay energized\r\nLED „off“ means fault - operating speed below trip point,\r\noutput relay deenergized\r\nLE D-diode, orange\r\nThis LED will be lit of flashes according to the received pulses.\r\nFrom 1500 pulses / min. up the flashing will change to a continous\r\nlight. If the speed monitor relay is under operation, but the\r\norange LED remains to be off (out), either the pulse transducer or\r\nthe wiring between sensor and relay unit fails.\r\nPulses / min. Position of the\r\npulse range switch\r\nCut-out delay in sec.\r\nPick-up time of relay\r\nnon considered\r\n8 ... 120 I 7,5 ... 0,5\r\n80 ... 1200 II 0,75 ... 0,05\r\n800 ... 12000 III 0,075 ... 0,005\r\no p e r a t i o n s\r\nMonitoring of underspeed or standstill\r\nwith start-up delay\r\nAdjust the potentiometer to the required start-up delay-time.\r\nThe internal output relay is energized during the start-up time\r\n(contact 8 - 10 closed).\r\nThe relay will be cut off if the operating speed is below the trip\r\npoint (contacts 9 - 10 closed).\r\nNote: In addition, if it is necessary to monitor pulse failure, the\r\nKiepe speed monitor model EDO should be used.\r\nMonitoring of overspeed (maximum speed)\r\nwithout start-up delay\r\nSet the start-up potentiometer to zero (fully left).\r\nThe internal output relay will be energized\r\n(contact 10 - 8, closed) as soon as the operating speed is higher\r\nthan the adjusted setpoint.\r\n\r\nT e c h n i c a l D a t a\r\n\r\nDevice complies with EN 50178-94\r\nEN 50081-1\r\nEN 50082-2\r\nEN 60204\r\nOperating Principles Underspeed or standstill\r\nMechanical The plug-in base is resistant to tracking and houses the cable entries and\r\nconnection terminals. The housing contains the plug-in PCB.\r\nActuating Supply Voltages AC 230 V, 50 ... 60 cyc., other voltages by request.\r\nVoltage Tolerance ± 10 %\r\nPower Consumption Approx. 2.5 VA\r\nAmbient Temperature - 25 °C ... + 70 °C\r\nStorage Temperature - 35 °C ... + 80 °C\r\nTrip Point Accuracy ~ 1 % (at constant temperature)\r\nReset Differential 10 % at pre-set speed\r\nPulse Duration 9 1.5 ms\r\nPick-up Time For the internal output relay of the Speed Monitor unit with starting by-pass it\r\nis 150 ms after having connected the JMNC to the actuating supply voltage.\r\nStarting By-pass 0 - 45 sec. adjustability\r\nProtection IP 51 (dust and drip-proof) according to EN 60529\r\nMounting Position Vertical\r\nOutput Contact 1 changeover contact\r\nContact ratings Ie / Ue AC 2 A / 230 V

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