MODMECA & MODELEC
Contents
1. D C Tachogenerator 7 COMPUTER Recommended configuration PC compatible computer preferably AT with 640kb of RAM hard disk EGA or VGA graphics card MSDOS 3 1 version or later MSDOS is a trademark of Microsoft Corporation IBM PC AT is a trademark of International Business Machines Corporation S cr SOMER 15 INTERFACE The interface transmits data between the measurement modules and the computer See below some possible Interface software combinations INTERFACES SOFTWARE ORPHY GTS from MICRELEC LS PC MULTI 01 from LEROY SOMER MULTISCAN 1 1 from DMS DIDALAB PCMES3 from EUROSMART LS PC MULTI 01 from LEROY SOMER MULTISCAN 1 1 from DMS DIDALAB PHYSCOPE from EUROSMART LAB PC from NATIONAL INSTRUMENT LS PC MULTI 01 LEROY SOMER MULTISCAN 1 1 from DMS DIDALAB PCADC12B 8V from DIGIMETRIE LS PC MULTI 01 LEROY SOMER MULTISCAN 1 1 from DMS DIDALAB MULTI E S from DMS DIDALAB MULTISCAN 1 1 from DMS DIDALAB OPERATION Depending on the sofware used it is possible to plot the characteristics of A C and D C machines study starting problems under constant voltage under adjustable voltage etc study a motor in combination with its power electronics take readings during transient states etc PHYSCOPE is a trademark of EUROSMART LS PC MULTI 01 is a trademark of2. 10 LS SOMER Example the voltage supplied by a voltage chopping device Select rating 50 V It is assumed that the frequency is low enough for primary harmonics to be taken into account st case E 90V gt u 30V E lt 2x50 100V u t the display shows a correct measurement E 2nd case 120 V gt u 40V E gt 2x50 100V the display shows an incorrect measurement JE T Note for D C voltages and the 500 V D C rating it is possible to measure voltages up to 1000 V Current measurement MEAN VALUE For currents less than 2 A e g the excitation current of a D C machine use the black terminal and the red terminal marked with the e symbol For currents which could exceed 2 A e g the armature current of a D C machine use the red and black terminals associated with the knob Select the correct range by turning the knob to 2 A or 20 A Insert the ammeter in the circuit using the black terminal common and the red 2 A or 20 A terminal according to the range selected f the end of range peak factor of 2 is adhered to the measurement is correct otherwise the value shown on the display will be an incorrect measurement Voltage measurement RMS VALUE The electrical module measures the RMS value of the input voltage This measurement takes the D C component into account Select the correct range by turning the knob to
3. Reset button To reset interface IS o SOMER 19 7 DIAGRAM of D C CONNECTIONS between the Electrical and Mechanical Module analogue outputs the R C filter unit and the ORPHY GTS interface for use with LSPC MULTI 02 software T Torque mean Chan lt gt n Speed of rotation n Speed of rotation mean Mechanical power mean Chan EA1 lt gt T Torque T Torque instantaneous Chan EA2 lt gt Uor U RMS or mean n Speed of rotation instantaneous voltage value Chan EA3 lt gt RMS or mean l Mean current current value l RMS current Chan EA lt gt not used i Instantaneous current _ Chan EA5 lt gt Mean electrical U Mean voltage E power value U RMS voltage Chan EA6 lt gt P Mean electrical u Instantaneous voltage E power value n Chan EA7 lt gt le Mean excitation P Mean electrical power current value p Instantaneous electrical power COM lt gt Earth to be connected to le Mean current earth terminals located at the rear of the Modules Wiring example for measuring the mean value of D C voltage and current Analogue outputs BS T Coupleinstantan Instantaneous torque n Vit de tati tantan R fMODMECA rolational speed instantaneous value and U are used to measure mean values N 0000 000 00 T Couple moyen mean torq
4. 4 2 Torque control RAI Ai arl e Eee 5 WIRING DIAGRAM modules brake strain gauge and D C tachogenerator 6 A C CONNECTION DIAGRAM connection for measuring A C U and I 7 D C CONNECTION DIAGRAM connection for measuring D C U and I IS o SOMER pages A A A A 5108 9 to 13 14 14 15 to 16 16 17 18 19 20 1 GENERAL INFORMATION 1 1 Principle MODELEC 3 is a multifunction measurement device with displays enclosed in a plastic case It is used to obtain isolated analogue voltages of 5V which correspond to the electrical values measured MODMECA 3 is used to supply the bridges of force or torque transducers powder brake excitation and for measuring and displaying the mechanical values of rotating electrical machines in the 0 3 and 1 5 kW ranges and is enclosed in a plastic case It is used to read the mechanical values which are required when designing rotating electrical machines The information obtained from the LED displays and from the module analogue outputs can be used in various ways according to the equipment available By reading the displays directly By storage oscilloscope By using a micro PC linked to an A D Interface and application software 1 2 Electrical characteristics Mains power supply voltage Single phase voltage 230V 10 50 to 60 Hz Co
5. 5V analogue outputs electrically isolated corresponding to the parameters measured D C Mean value rating 2 A D C Mean value rating 2 or 20A A C RMS value rating 2 or 20 A D C VOLTAGE Mean value rating 50 or 500 V A C VOLTAGE RMS value rating 50 or 500 V POWER Mean value rating 0 1 1 10 kW There are also 5 V peak image outputs electrically isolated ie CURRENT 1 INSTANTANEOUS CURRENT output 2 or 20 A peak depending on rating VOLTAGE 1 INSTANTANEOUS VOLTAGE output 50 or 500 V depending on rating POWER 1 INSTANTANEOUS POWER output 0 2 2 20 kW depending on rating module power supply protection fuse 1 25 A time delayed e Socket for connecting the power supply cable to the mains 220 V single phase 50 Hz The cable is fitted with a 2 P E 6A plug and is 1 5 m long Note the connection terminals on the rear panel are intended for 4 mm Y plugs 2 2 4 Starting up The device is ready to use after connection to the mains supply 230 V single phase earth 50 Hz It is started up by pressing the on off I O switch Voltage measurement MEAN VALUE Select the correct rating by turning the knob to 50V or 500V Connect one of the cables to the black terminal common and the other to the red 50V or 500 V terminal according to the rating To obtain a correct measurement the peak voltage value should not exceed twice the selected rating LEROY
6. 2 MODMECA 3 Weight 5 kg 255 mm IS o SOMER according to EN 50082 2 conducted and EN 50081 2 conducted Width 370mm height 140mm depth 255 mm 2 MEASUREMENT MODULES 2 1 Electrical measurements MODMECA3 2 1 1 General The module comprises the following elements the device for measuring and reading the speed of rotation n of the driven machine from the voltage supplied by the D C tachogenerator the force transducer display conditioner for power supply measurement and display of torque T the device for measuring and reading the mechanical power P from the speed and torque T data the device for power supply control and servo control of the powder brake 2 1 2 On the front panel there are NE s Los co MEN pre 3 LED displays 13 mm high which correspond respectively to MECHANICAL POWER Pm 20 000 point display in watts Rating 300 or 3 000 W Accuracy lt 3 SPEED OF ROTATION n in revolutions per minute 20 000 point display Rating 2 000 or 6 000 min Accuracy lt 1 TORQUE T expressed in N m 2 000 point display Rating 10 or 40 Nm Accuracy lt 2 e the rate setting potentiometer for speed n e the speed selector switch 2 000 or 6 000 min which is used to modify the voltage image of the analogue output and internal operation of the speed control t
7. 2000 min and 5 V at 6000 min and modifies operation of the internal control mechanism torque measurement Using the cable with 7 pin DIN plugs connect the force or torque transducer to the mechanical measurement module Torque is expressed in N m Set the power selector switch to 0 3 or 3kW according to the type of transducer used LEROY 6 LS SOMER Adjustment of zero An offset potentiometer can be used to adjust the zero setting in the measurement system transducer not involved Calibration A potentiometer can be used to adjust the gain in the torque measurement system A removable torque arm supplied with the module can be used to recalibrate the system according to the instructions in the FP3 10 FP10 15 or FP15 30 electroma gnetic power brake manual mechanical power measurement Mechanical power is measured using an analogue multiplier which obtains the product TQ Power is expressed in Watts mechanical load control The mechanical load made up of the magnetic powder brake is controlled by the mechanical module after connecting the brake output of the module to the powder brake coil terminals A 6 position switch is used to select the operating mode of the device 1st position O the brake is not energized the motor is only subject to the residual torque 2nd position T m manual torque control the braking torque
8. 50 V or 500 V Connect the voltage to be measured between the black terminal and the red 50 V or 500 V terminal according to the range selected f the end of range peak factor of 2 is adhered to the measurement is correct otherwise the value shown on the display will be an incorrect measurement Note For sinusoidal voltages and the 500 V rating it is possible to measure voltages with a maximum RMS value of up to 700 V Current measurement RMS VALUE The electrical module measures the RMS value of the current and takes the D C component into account Select the correct range by turning the knob to 2 A or 20A IS o SOMER 11 Insert the ammeter in the circuit black terminal 0 and red 2 or 20A terminal according to the range selected If the end of range peak factor of 2 is adhered to the measurement is correct otherwise the value shown on the display will be an incorrect measurement Power measurement active and reactive General The electrical module has an analogue multiplier which obtains the product u t x i t then by low pass filtering the D C component corresponding to the mean power received or supplied by a dipole is extracted wattmeter e The voltage drop caused by the ammeter is negligible use a HALL effect current transducer For the voltmeter select the correct range by turning the knob to 50 V or 5
9. LEROY SOMER MultiScan 1 1 is a trademark of DMS DIDALAB 4 EXAMPLE OF USE 3 PHASE INDUCTION MOTOR All the standard readings can be performed with this equipment This section describes experiments which cannot usually be carried out STABLE AND UNSTABLE OPERATION 4 1 Speed control a Experiment having wired up the motor and installed the computer system turn the brake switch to position n m manual speed control Power up the motor at reduced voltage starting it at no load Turn the brake control potentiometer and display on the computer screen the T n characteristic of the machine by decreasing the speed until the motor n cnst locks then increasing it again Only the increasing part ie locking at maxi mum speed is recorded thus obtaining the graph opposite operating point b Interpretation controlling speed comes down to imposing a speed on the rotating set With this type of control the Tr n characteristic of the load is for m a given speed a vertical line By varying the speed a network of Tr n characteristics is obtained whose intersections with the T n characteristic n give the various operating states of the set All these operating states are shown on the screen By joining up all the min points the T n characteristic of the motor can be plotted LEROY 16 LS SOMER 4
10. is adjusted by the manual control potentiometer This control T cnst simulates loads representative of industrial applications for which the torque required to drive the load is independent of the speed with the power remaining proportional to the speed Examples lifting conveyors displacement grinders etc 3rd position n m manual speed control the current supplying the powder brake is controlled in order to define the speed of motor rotation A P I type regulator is inserted in the control loop to ensure that the device is stable Due to this control the whole T n characteristic of the induction motor can be read even its unstable part For n gt 2 000 min set the switch to the 6 000 min position The speed is adjusted via the control potentiometer 4th position T a automatic torque control controlling the mechanical load defines the torque For n greater than 2 000 min set the switch to the 6 000 min position 5th position na automatic speed control Controlling the current in the mechanical load defines the speed of motor rotation Pressing the pushbutton defines the following cycle In this na control mode zero speed is detected This causes the control ramp to rise immediately and avoids operation with a locked rotor To draw the induction motor T n graph select speed control IS o SOMER 7 starting brak
11. position switch of D C or A C power Ratings 100 W 1kW and 10 kW 2 2 2 Front panel 4 x 20 000 point LED displays 13mm high corresponding to current D C rating 2 A Accuracy lt 1 2 terminals current D C rating 2 and 20 A Accuracy lt 1 and A C rating 2 and 20A Accuracy lt 1 1 peak 4 or 40A 3 terminals voltage D C rating 50 and 500V Accuracy lt 1 and A C rating 50 and 500V Accuracy x2 U peak 1000V 3 terminals power D C Accuracy lt 2 and A C Accuracy lt 3 for f lt 200 Hz Passband 5 kHz at 3dB Rating 100 W 1 kW and 10 kW according to the current and voltage ratings 4 position current switch for selecting current type and rating 4 position voltage switch for selecting voltage type and rating Note the sockets are double sink safety type with protection They can take 4 mm safety plugs or 4 mm Y banana plugs IS o T SOMER 2 2 3 On the rear panel there is Intensit moyenne Mean current Intensit efficace RMS current i i RMS voltage i Intensit instantan e instantaneous current instantan e Instantaneous voltage Intensit moyenne Mean current instantan e Instantaneous power w w Y U U u da SORTIES ANALOGIQUES 5V 5V ANALOGIC OUTPUTS 5V 5V e the On Off switch the
12. 00 V and connect the voltage circuit between the black terminal common and the red 50 V or 500 V terminal according to the range selected For the ammeter select the correct range by turning the knob to 2 A or 20 A and connect the current circuit between the black terminal common and the red 2A or 20A terminal according to the range selected The wattmeter operates with D C or A C voltages and currents 3 phase electrical power measurement The electrical power drawn by a 3 phase motor is expressed by P UI V3 cos where U voltage between phases 1 line current lagging between the current passing through a coil and the voltage at the terminals of that coil p is never the lagging between U and I Measuring P with one single device will give either P Ulcos 30 or UI cos 30 For a correct power measurement a phase switch should be combined with the wattmeter to use the 2 wattmeter method P P1 P2 Another method consists of measuring the current in a winding and the voltage at the terminals of the same winding this is the method that is shown below This method enables P active power to be measured and directly recorded with a single device In cases where the motor has a star connection the neutral should be used For a delta connection the motor should be connected according to the following diagram Active power the following scheme enables the active power to be read dir
13. 2 Torque control Experiment A e Turn the brake switch to position T m manual torque control Non outward e Power up the motor at its rated voltage starting it at no load return e Turn the brake control potentiometer and display on the monitor screen the T n characteristic of the machine by increasing the resis tive torque When the torque reaches a certain resistive torque value the motor locks abruptly Decrease the motor load When the torque reaches a new resistive torque value the machine will unlock as abruptly as it locked and then stabilizes at a previously obtained speed n min Interpretation the rate of theT n characteristic of the motor is shown opposite Controlling the torque comes down to imposing a torque on the set T With this type of control the Tr n characteristic of the load is ata M given moment a horizontal line B A Tr On the graph draw a horizontal line It intersects the T n P characteristic at points A and B nominal operating Investigation at point A point Increasing the speed reduces the motor torque T As the resistive torque Tr is constant the difference T Tr is negative and the motor tends to slow down and then stabilize at speed ny Decreasing the speed increases the motor torque T As the resistive N x torque Tr is constant the difference T Tr is positive the rotating set n mt tends to accelerate and then stabilize at s
14. LEROY SOMER MODMECA amp MODELEC Modules for measuring electrical and mechanical values User manual C CERTIFICATION according to the Low Voltage Directive directive 73 23 EEC modified by 93 68 EEC applicable from 1 01 97 Electromagnetic Compatibility EMC conforming to IEC 1000 4 2 EN 50082 2 conducted EN 50081 2 conducted They meet the requirements of standards EN 60 204 and EN 60 309 French decree 88 1056 and the order of 13 December 1988 establishing the special clauses which apply to test platforms and prototype laboratories NOTE LEROY SOMER reserves the right to modify its product characteristics at any time to incorporate the latest technological developments The information contained in this document may therefore be changed without prior warning WARNING OPERATING RECOMMENDATIONS The electrical power supply for the module should be supplied with a differential of 30 mA and have an easily accessible emergency stop Before moving the module always ensure that the power is turned off and that the power supply cable has been disconnected The connecting cables for the double sink sockets should be fitted with corresponding safety plugs INSTALLATION RECOMMENDATIONS The module should be placed in a location which is lit in accordance with the requirements of health and s
15. afety regulations It should be placed on a level surface The user should have within reach a device to disconnect the power supply PRECAUTIONS BEFORE USE Check that the module has been earthed Check that the cabling conforms to the instructions given in the user manual and that the control voltages correspond to the module rating PRECAUTIONS DURING USE Ensure that there is an emergency stop device nearby Before carrying out any work on the module ensure that all power supplies have been disconnected LEROY SOMER declines all responsibility in the event of the above recommendations not being observed IS o SOMER CONTENTS 1 GENERAL INFORMATION Principle inet na n ii ue ce clio alia 1 2 Electrical characteristics i 1 3 Environmental characteristics nea enma nenea 1 4 Weight and dimensions nenea 2 MEASUREMENT MODULES 2 1 Mechanical measurements nennen nennen nnne nnne na 2 2 Electrical measurements nenne eene eren 3 OPERATION 3 1 Traditiorial operation ea o pit Ped 3 2 Operation with analogue plotter eene 3 3 Operation with computer system emen 4 EXAMPLE of OPERATION induction motor 431 Speed Controli 4i decet idad
16. cted to le Mean current earth terminals located at the rear of the Modules Wiring example for measuring the RMS value of A C voltage and current BRE T Coupleinstantan Instantaneous torque Vitesse de rotation instantan e R f MODMECA rotational speed instantaneous value N 0000 000 00 T Couple moyen mean torque je A Vitesse de rotation valeur moyenne ue Am re rotational speed mean value Analogue outputs 230V T P Puissance m canique valeur moyenne n FX 50 Hz Fus 1 25A mechanical power mean value fec anal0wic outp E PG non I and U are used to measure mean values Analogue outputs and U are used to measure RMS values T Intensit moyenne mean current l Intensit efficace RMS current i Intensit instantan e instantaneous current Te Intensit moyenne Mean current U Tension moyenne Mean voltage U Tension efficace RMS voltage Tension instantan e Instantaneous voltage p P Vue Arri re Puissance moyenne Mean power Puissance instantan e Instantaneous power Fus 1 25A 2P E plug computer connection V24 serial link DIN output On off EA4 EA5 EA6 EA Ribbon connection cable between the R C filter and ORPHY ORPHY GTS R ti EDT INTERFACE Transmission
17. der such as an analogue plotter by using a storage oscilloscope by using a micro PC linked to an A D Interface and application software examples below 3 1 Traditional operation The user makes manual adjustments to the current intensity supplying the electromagnetic brake A resistive torque is exerted on the motor shaft He can read the various braking current values from the measurement units and can then plot the machine characteristics 3 2 Operation with plotter The analogue outputs enable an analogue plotter to be used ANALOGUE OUTPUTS analogue plotter LEROY 14 IS SOMER 3 3 Operation with computer system By replacing the plotter with an interface linked to a computer and LS PC MULTI 02 software we obtain a system which ma kes the user s task considerably easier as the computer performs all the tedious tasks such as calculations selecting scales and plotting graphs MOUNTING The computer is linked to the Measurement Module MODMECA and MODELEC transducers via an A D interface See below a synoptic diagram of the system with a loading bank for machines in the 1 5 kW range digital plotter POWER SUPPLY DD 400V TRI PE DO BLOCK TERMINAL BLOCK Powder brake TRANSDUCER TERMINAL MOTOR TERMINAL BLOCK
18. ectly on the P display of the module The wattmeter reading should be multiplied by 3 assuming that the 3 phases are balanced LEROY 12 IS SOMER 3 PHASE ACTIVE POWER MEASUREMENT The following scheme enables the active power to be read directly on the Pu display of the MODELEC The wattmeter reading should be multiplied by 3 assuming that the 3 phases are balanced MOD ELEC ELECTRICAL MEASUREMENT MODULE NOTE 1 a negative value If the power display shows reverse the voltmeter or ammeter connection MAINS b VOLTAGE 7 1 1 230 V 400 V 2 2 tri tri 2 50 Hz 50 Hz 3 3 PHASE STATOR 220 V delta 380 V star delta connection Ul VI WI 3 PHASE STATOR 220 V delta 380 V star star connection Reactive power the following scheme enables the reactive power to be read directly on the P display of the Electrical Measurement module The wattmeter reading should be multiplied by Assuming that the 3 phases balanced Reminder if the reading of the wattmeter W in watts is kq the reactive power drawn by the motor is Q V3 kg in VARs IS o SOMER 13 3 OPERATION The information obtained from the module analogue outputs can be used in various ways according to the equipment available by using an analogue recor
19. he power selector switch 0 3 or 3KW which is used to adapt to the type of force transducer fitted on the powder brake F 20 or 50 kgf or the type of torque transducer used with the loading bank T 210 or 50 Nm the offset potentiometer which is used to adjust the torque measurement zero the calibration or rate setting potentiometer for torque measurement the 6 position switch which is used to select the brake operating mode 1st position zero control 0 2nd position manual torque control T m 3rd position manual speed control n m 4th position automatic torque control T a 5th position automatic speed control n a 6th position torque control via external U T exter IS o T SOMER 5 the button for setting the control potentiometer to manual mode the spring return pushbutton which controls the braking ramp with either speed or torque control in automatic mode the 2 DIN sockets 7 and 5 pin for connecting the cables from the force transducer and the D C tachogenerator the 2 brake terminals for 4mm safety plugs for connection to the powder brake coil 2 1 3 On the rear panel there are MECA3 Couple instantan Instantaneous torque Vitesse instantan e de rotation Instant rotational speed Couple moyen Mean Torque Vitesse moyenne Mean speed Puissance m canique Mechanica
20. ing 5s 15s t lt o i Be 6th position T ext torque control by external voltage 0 to 5 V This external control can be used to adjust the load braking torque using for example the simulation module ref MOD SIM Hence it is possible to simulate loads representative of industrial applications such as a torque increasing in a linear manner relative to the speed resistive torque ratio T kn power varies as the square of the speed Examples dosing pumps agitators mixers etc b torque varying as the square of the speed resistive torque ratio T kn power varies as the cube of the speed Examples centrifugal pumps fans etc c torque varying in a manner inversely proportional to the speed resistive torque ratio T k n output power remains constant whatever the speed Examples turning drilling winder etc The input terminals for the torque ext control are located on the rear panel LEROY 8 IS SOMER 2 2 Electrical measurements MODELEC 3 2 2 1 General The module comprises the following elements Measurements and readings of D C mean value Rating 2 A of D C mean value 2 ratings 2 and 20A or A C RMS value 2 ratings 2 and 20A Reading modified via 4 position switch of D C voltage mean value 2 ratings 50 and 500V or A C RMS value 2 ratings 50 and 500V Reading modified via 4
21. l power Commande ext rieure Y Y Y External control U 2 T T n SORTIES ANALOGIQUES 5V 5V 0 5V JV ANALOGIE OUTPUTS 5V 45V e the 5V isolated analogue outputs which correspond to the parameters measured 2 SPEED outputs 1 mean value output and 1 instantaneous value output 5V at 2000min or 5V at 6000min according to the position of the 2000 6000min switch on the front panel 2 TORQUE outputs 1 mean value output and 1 instantaneous value output 5V 10 N m or 5V 40 N m according to the position of the 0 3 3kW switch on the front panel 1 mean value mechanical POWER output 5V at 1kW or 5V at 4kW according to the position of the 0 3 3kW switch on the front panel 0 5 V analogue input for external torque control the module power supply protection fuse 1 25 A time delayed e socket for connecting the power supply cable to the mains 230V E single phase 50 Hz 2 P E 6 1 5 m Note the connection sockets on the rear panel are designed for 4 mm diameter safety plugs 2 1 4 Preparation speed measurement using the cable with 5 pin DIN plugs connect the D C tachogenerator to the measurement module Speed is expressed in min Calibration a potentiometer is used to calibrate the speed measurement system 2000 or 6000 min switch this only modifies the image of the speed on the analogue output located on the rear panel ie 5 V at
22. nnected to the mains via 1 power supply cable L 1 5m supplied 1A General by 1 5A time delayed fuse Input current Protection Signalling via indicator on front panel Connection Measurement circuit inputs Measurement circuit outputs on female double sink safety sockets on the front panel on female double sink safety sockets on the rear panel on MODMECA 3 powder brake control circuit torque transducer circuit speed transducer circuit on female double sink safety sockets on the front panel on 7 pin DIN socket on the front panel via 1 power supply cable L 1 5m supplied on 5 pin DIN socket on the front panel MODMECA 3 is connected to the force transducer via a cable fitted with a 7 pin DIN plug at each end L 1 5m supplied MODMECA 3 is connected to the speed transducer via a cable fitted with a 5 pin DIN plug at each end L 1 5m supplied 1 3 Environmental characteristics Protection Temperature storage 20 C to 50 C operation transportation 0 C to 40 C e 20 C to 50 C Altitude Less than 1000m Current derating 0 5 per additional 100m Humidity without condensation Conforms to IEC 68 2 3 and IEC 68 2 30 Vibration Conforms to IEC 68 2 61 Electromagnetic compatibility 1 4 Weight and dimensions MODELEC 3 Weight 5 kg Width 370mm height 140mm depth Conforms to IEC 1000 4
23. peed A is a stable operating point All the points in the NM part of T n are stable operating points Investigation at point B Increasing the speed increases the motor torque T As the resistive torque Tr is constant the difference T Tr is positive the rotating set tends to accelerate and then stabilize at speed n Decreasing the speed decreases the motor torque T As the resistive torque Tr is constant the difference T Tr is negative the rotating set locks B is an unstable operating point All the points in the MD part of T n are unstable operating points During this operation starting with zero resistive torque then gradually increasing this resistive torque we have described the stable NM part of the characteristic When the speed corresponding to point M is achieved the motor is in an unstable state and locks It can only restart when the resistive torque value is less than the starting torque In this case as the motor is in an unstable state it accelerates abruptly to reach the stable operating zone where the speed stabilizes IS o SOMER 17 5 WIRING DIAGRAM Example of wiring with the loading bank with powder brake type FP3 10 for machines in the 0 3 kW range between the MODMECA Brake output and the coil of the powder brake on the test bank Connect using cables fitted with double sink safety terminals the DIN outpu
24. t of the torque transducer terminal block on the test bank and the MODMECA 3 torque transducer input Connect using the cable fitted with a 7 pin DIN plug supplied with the MODMECA 3 the DIN output of the D C tachogenerator terminal block and the MODMECA 3 D C tachogenerator input Connect using the cable fitted with a 5 pin DIN plug supplied with the MODMECA 3 MODELEC 3 MODMECA 3 LEROY 18 IS SOMER 6 DIAGRAM of A C CONNECTIONS between the Electrical and Mechanical Module analogue outputs the R C filter unit and the ORPHY GTS interface for use with LSPC MULTI 02 software T Torque mean Chan lt gt n Speed of rotation n Speed of rotation mean P Mechanical power mean Chan EA1 lt gt T Torque T Torque instantaneous Chan EA2 lt gt Uor U RMS or mean n Speed of rotation instantaneous voltage value _ Chan EAS lt gt lori RMS or mean current current value RMS current Chan lt gt not used i Instantaneous current Chan lt gt Mean electrical U Mean voltage u power value U RMS voltage Chan lt gt P Mean electrical u Instantaneous voltage power value Chan EA7 lt gt le Mean excitation P Mean electrical power current value p Instantaneous electrical power COM lt gt Earth to be conne
25. ue Vue Arri re Vitesse de rotation valeur moyenne rotational speed mean value 230V T P Puissance m canique valeur moyenne Analog ue outputs Fae tS 1 mechanical power mean value and U are used to measure RMS values Intensit moyenne mean current Intensit efficace AMS current Intensit instantan e instantaneous current Intensit excit moyenne mean current Tension moyenne mean voltage Tension efficace RMS voltage Tension instantan e Instantaneous voltage SCCI gr Puissance moyenne mean power p Puissance instantan e Instantaneous power ies analogiques O amp halogic outputs p P U u Ua I i 60006090 U Masse V24 serial link DIN output p computer connection On off Ribbon connection cable between ORPHY GTS the RIC filter INTERFACE and ORPHY Transmission Reset button To reset interface LEROY 20 LS SOMER Ref OV orf O LEROY SOMER LEROY SOMER LEROY SOMER LEROY SOMER MOTEURS LEROY SOMER 16015 ANGOULEME CEDEX FRANCE Imprimerie MOTEURS LEROY SOMER RC ANGOULEME B 671 820 223
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