76 cat-pos-e-2001 asm nmg2 stop-time measuring system specifications measurement function stop-time measurement range 0 ... 5000 ms resolution 1 ms accuracy of time base 0.5 ms -0,05 % stability of time base (temperature) 50 ppm / k relay compensation time delay of release contact will be compensated at every measurement standstill detection v < 10 mm/s measurement function position measurement range 0 ... +2500 mm (standard) -9999 ... +9999 mm (maximum) sensor measurement range up to 30000 mm determination of stop point -9999 ... 9999 mm resolution of measuring device 1 mm (with printer option: 0.1 mm) resolution of sensor 25 m accuracy 0.05 % full scale 1 digit influence of temperature 0.005 % full scale / k measurement function velocity measurement range -9999 ... +9999 mm/s resolution 2,5 mm/s accuracy 2,5 mm/s processor controlled measuring system for machine safety measurements according to din en 99 portable and solid equipment, built-in matrix printer free adjustable stop point standstill detection down t ov<1 mm/s measurement of maximum velocity measurement of velocity at stop point iso9000 calibration certificate traceability of measurement values rs-232 interface for pc connection fast set-up time actuator to release no-touch safety equipment as option printer material printer paper, 1 roll nmg2-dp printer ribbon, 1 piece nmg2-df order code nmg2 model name option printer p = built-in matrix printer delivery of the nmg2 complete with sensor ws2.1, magnetic clamp and connector cables. nmg2 - 2500 order example: nmg2 - 2500 - p
asm cat-pos-e-2001 77 specifications general displays 2 x 4 digit led with sign trigger output logic signal 5 v, h l at stop-point stop contact nc / no, 230 v a c/5a fuse protection of stop circuit 5 a slow-blow supply voltage 230 v ac power consumption 30 w max. dimensions 425 x 325 x 205 mm weight 10.5 kg incl. case operation temperature 0 c ... 40 c humidity 80 % r.h. max., non condensing immunity to interference (emc) according to iec 1000-4-2, 3, 4 nmg2 stop-time measuring system the nmg2 is designed to measure stop time, stop distance and velocity of power driven machinery like presses or punches. in accordance with national and international safety standards machines with dangerous movements have to be equipped with protection devices. the improper placement of a protection device (2-hand control, safety light curtain and so on) will result in the potential for injury of the operator. with the nmg2 all the important measurement values such as stop-time, stop-distance and velocity are provided to calculate the minimum safety distance. the safety distance is defined in national and international standards like din en999. to ensure maximum safety the stop-time meas- urements have to be repeated periodically (6 months). introduction operating principle the measuring cable of the ws position sensor will be connected to the moving part of the machine with a magnetic device or a fixing screw. the sensor sends an incremental pulse signal to the microprocessor controlled counter. the stop position can be selected by a digital encoder. if the position signal passes through the determined stop position in the selected direction a galvanic isolated contact will cause the stop of the machine and the stop-time measurement will be started. the position measurement values will be recorded until the machine has stopped completely. the two displays of the measuring device will show the measurement values of stop-time and distance. by pressing a button the velocity at the stop position can be displayed. a measurement protocol will be printed. a velocity measurement can be made to locate the position of the maximum velocity, because the stop point should be located at this position. this measurement will determine the maximum velocity of the machine and its position. the nmg2 can be used as a comfortable position and velocity measurement system in different applications. the measurement values can be transmitted to a pc or a laptop via the rs-232 interface and processed with any software. additional an actuator can be controlled to interrupt a safety light curtain, so that it is not necessary to insert the relay contact into the machine circuit. safety distance the minimum safety distance for 2-hand guards or safety light curtains is calculated as a product of the machine stop-time and a determined maximum hand speed. the definition for the maximum hand speed differs from country to country. the actual valid safety regulations (for example en999) have to be regarded. the stop-time measurement must be made at the worst conditions of the machine to determine the maximum stop-time and the correct safety distance.
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