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description u bea--250059-en-03 en web tension measuring amplifier cv 2201 1. safety instructions 2 2. function 3 3. transport 3 4. assembly 4 5. installation 4 6. commissioning 5 7. troubleshooting / repair 9 8. disassembly 10 9. wiring diagram 10 10. technical data 12 free datasheet http:///
web tension measuring amplifier cv 2201 bea--250059-en-03 u 2/12 1. safety instructions 1.1 description keep this description in a safe place and accessible for the personnel at all times. the description is part of the items supplied and is to be read carefully prior to starting assembly, operation or maintenance. the documentation for an e+l system essentially comprises the high- er level system description (a), the individual descriptions of the com- ponents (b, c, ... w), spare part lists (x) and the circuit diagrams (z). proceed in accordance with the instructions in the system description. all important processes are described in the system description. where necessary, reference is made to the descriptions of the individ- ual components. 1.2 intended use the measuring amplifier is only allow ed to be used to amplify e+l load cell signals. the measuring amplifier is only allowed to be installed in the custom- er's machine as defined by e+l. the measuring amplifier is not allowed to be modified. the measuring amplifier is built to the state-of-the-art. nevertheless, during operation ? hazards for the user's health or ? damage to property may occur. only use the measuring amplifier ? if in correct working order, ? paying due attention to safety and hazards while observing the lo- cally applicable, statutory and custom ary safety regulations as well as the regulations for the prevention of accidents. 1.3 user groups all the activities in this description are only allowed to be undertaken by the user groups listed in the following with the stated qualifications. activities user groups qualification transport/assembly, commissioning, troubleshooting/repair, maintenance, dis- assembly specialist personnel technicians, industrial mechanics, fitters etc. installation, disassembly specialist personnel electrical connection only by electricians operation specialist personnel, unskilled personnel, trainees instruction by the operating organization free datasheet http:///
web tension measuring amplifier cv 2201 bea--250059-en-03 u 3/12 1.4 explanation of symbols danger! signifies that death or serious injury will occur immediately if the relat- ed safety measure is not taken. warning! signifies that death or serious injury may occur if the related safety measure is not taken. caution! signifies that minor injury may occur if the related safety measure is not taken. notice signifies that a malfunction or dam age may occur if the related mea- sure is not taken. ? jobs to be performed. 2. function 2.1 purpose the measuring amplifier is part of the web tension system eltens from e+l. it provides the supply vo ltage for the load cells pd (max. 2 pieces), and amplifies their signals. a voltage from 0 to max. 20 mv at the inputs of the amplifier is ampli- fied to an output voltage from 0 to 10 v (or 0 to 20 ma or 4 to 2 ma). 3. transport ? only transport measuring amplifier in the original packaging. ? observe the transport instructions on the original packaging. ? dispose of packaging material correctly. ? check measuring amplifier for damage. free datasheet http:///
web tension measuring amplifier cv 2201 bea--250059-en-03 u 4/12 4. assembly ? mount measuring amplifier near the load cells. 5. installation warning! electric shock! live parts can cause an electric shock. ? never touch live parts. ? connect electrical cables as per the circuit diagram, during this task pay attention to the information on cross-section and screen- ing. ? ensure the insulation is not damaged and the cables are properly fixed and protected. 5.1 supply voltage the supply voltage for the measuring amplifier is 24 v dc. 5.2 load cell ? lay signal cable separate from c ables carrying interference or high currents (for example motor cables). ? connect signal cables directly to the measuring amplifier without intermediate terminals. ? ensure the screening on signal cables is only connected to ground at the measuring amplifier. notice the connecting cables between the load cells and the measuring am- plifier should be kept as short as possible. 5.3 earth and ground connections notice all e+l components must be at the same ground potential as the entire machine. cables not procured from e+l must be the same as the e+l cables, that is they must also be screened so that all connections can be made as shown in the wiring diagrams. free datasheet http:///
web tension measuring amplifier cv 2201 bea--250059-en-03 u 5/12 ? make earth and ground connections as shown in the wiring dia- grams. see also emc leaflet. 6. commissioning 6.1 measuring roller notice the measuring rollers must be mounted free of mechanical stress and move freely. 6.2 safety barriers notice in conjunction with safety barriers, the bridge voltage u b must be ad- justed from 10 v dc to the maximum using the potentiometer r40 (right stop). r 40 free datasheet http:///
web tension measuring amplifier cv 2201 bea--250059-en-03 u 6/12 6.3 web tension measuring amplifier ? switch on supply voltage and check whether the led (1) on the measuring amplifier illuminates. ? connect digital voltmeter (measuring range 15 v dc) to the termi- nals for the output voltage u direct . see wiring diagram or chapter connection. ? set switch s11 for the gain range to position 2. 6.3.1 tare calibration notice the measuring roller must be without load. external interfering factors that could affect the measured result, such as the roller weight, are compensat ed using tare adjustment (zero cal- ibration). ? adjust output voltage u direct as accurately as possible to 0.0 v or less than 0.05 v with the aid of the potentiometer for coarse (r 41) and fine adjustment (r42). 6.3.2 calibration notice the amplifier can be calibrated with or without a test weight. we recommend undertaking calibration with a test weight, as this method is considerably more accurate. in conjunction with safety barriers or load cells of types pd 15.. and pd 25.., calibration without a test weight is not possible. s11 1 r41 r42 free datasheet http:///
web tension measuring amplifier cv 2201 bea--250059-en-03 u 7/12 the resultant web tension in the measuring direction should not signif- icantly exceed the nominal measuring force so that, in case of asym- metrical web tension distribution, th e individual load cells continue to operate in the linear range. 6.3.2.1 calibrating with test weight fig. 6-1: 1. belt 2. measuring roller 3. amplifier 4. test weight ? determine maximum web tension. this aspect was defined during planning. if this is not the case, determine web tension empirically. ? place a belt over the middle of t he measuring roller in the same way as the web will be positioned subsequently (see figure). ? hang the test weight on this belt; the weight should correspond to the web tension, as far as possible. ? measure signal voltage u e from the load cell at the amplifier's in- put. if the signal voltage is higher than the maximum range stated in the technical data for the load cell, the load cell is overloaded. ? change wrapping angle or measuring direction. ? if necessary, use heavier duty load cell. ? measure output voltage u direct . ? adjust amplifier using the potentiometer r43. turning clockwise will increase the amplification factor. ? in the case of a test weight that corresponds to the maximum web tension, the signal voltage from the load cell must be am- plified to an output voltage u direct of 10 v. ? in case of a smaller test weight, the output voltage must be set correspondingly lower. example: if the maximum web tension to be measured is 1000 n and there is a test weight of 750 n hanging over the measuring roller, the output voltage u direct must be 7.5 v. stated as a formula: 2 3 1 4 r43 u direct frce de t tet eit 10 lt i e tei free datasheet http:///
web tension measuring amplifier cv 2201 bea--250059-en-03 u 8/12 notice if the required output voltage is not achieved, the gain range must be changed using switch s11. if the output voltage is too low, set gain range 0, if the output voltage is too high, set gain range 1 or 3. if the required output voltage can still not be achieved, contact e+l service. ? once the output voltage is set, remove calibration weight and belt. the commissioning of the measuring amplifier is then complete. 6.3.2.2 calibrating without test weight notice in case of calibration without a test weight, a reference voltage is ap- plied to the amplifier's input instead of the signal from the load cell. ? determine maximum web tension. this aspect was defined during planning. if this is not the case, determine web tension empirically. ? then calculate the following data: ? resultant web tension in measuring direction (f r ) at maximum web tension ? output voltage u direct s11 f 1 f c f 2 = f x cos f r = f 1 + f 2 u direct = f n x 10 v x 1 (mv/v) f r k (mv/v) v = f n x 1000 x 1 (mv/v) f r k (mv/v) f = f 1 , f 2 = f r = f n = u direct = v = k = web tension web tension component f in measuring direction (n) resultant web tension in measuring direction (n) nominal load cell measuring force (n) note: in case of measurement on both sides (1 load cell on the right and one load cell on the left of the measuring roller) the nominal mea- suring force f n is to be doubled. output voltage (v) amplification factor nominal characteristic (sensitivity) of the load cell (e.g. 1 mv/v or 2 mv/v, see technical data for the load cell) f f f f f r f 1 f 2 f 2 free datasheet http:///
web tension measuring amplifier cv 2201 bea--250059-en-03 u 9/12 notice calibration without a test weight is only possible if the output voltage u direct calculated is < 12.5 v. ? press button s10 and keep pressed. button s10 simulates a nominal characteristic of 1mv/v. ? measure output voltage u direct . ? adjust gain using potentiometer r43 until the output voltage u direct calculated is displayed. turning clockwise will increase the amplifi- cation factor. ? release button s10. notice if the required output voltage is not achieved, the gain range must be changed using switch s11. if the output voltage is too low, set gain range 0, if the output voltage is too high, set gain range 1 or 3. if the required output voltage can still not be achieved, contact e+l service. the commissioning of the measuring amplifier is then complete. 7. troubleshooting / repair if a fault should occur in the measuring amplifier, it is necessary to re- place the device and send it to the factory. no parts can be replaced on-site. ? for information on disassembly of the measuring amplifier, see chapter "disassembly". r43 s10 s11 free datasheet http:///
web tension measuring amplifier cv 2201 bea--250059-en-03 u 10/12 8. disassembly warning! risk of injury! disassembly is only allowed to be undertaken with the machine switched off. ? switch off machine. ? secure machine against switching back on. ? disassemble in the reverse order of assembly as described in chapter "assembly". during this process follow all inst ructions given in the chapters "as- sembly" and "installation". 9. wiring diagram notice for the exact connection assignment for the installation of the inputs and outputs, refer to the wiring diagram. u filter u direct i direct pd.. pd.. free datasheet http:///
web tension measuring amplifier cv 2201 bea--250059-en-03 u 11/12 9.1 outputs the web tension is available in three different signals: ? filter output u filter (0 to 10 v/10 ma, rise time 2 s) for instruments. ? direct output u direct (0 to 10 v/10 ma, rise time 5 ms) for fast measured value acquisition and fo r downstream control circuits. ? current output i direct (0 to 20 ma or 4 to 20 ma, rise time 5 ms) for measured value transmission over longer distances. sliding switch in position 1: 4 to 20 ma sliding switch in position 2: 0 to 20 ma (works setting) notice make sure that the load (current sensing resistor) does not exceed a value of 600 ohm! the current output is only active with a positive voltage on the amplifi- er's input. should the load cell output a negative signal voltage, the connections for the bridge supply voltage +u b and -u b are to be swapped. free datasheet http:///
erhardt+leimer gmbh albert-leimer-platz 1 86391 stadtbergen, germany phone +49(0)821/2435-0 www.erhardt-leimer.com info@erhardt-leimer.com bea--250059-en-03 u 12/12 10.technical data subject to technical change without notice accuracy class 0.1 amplification range switch s11 0: 990 - 3400 1: 400 - 1250 2: 600 - 2050 3: 300 - 1025 input voltage u e 0 to 20 mv output - voltage - filtered voltage - current 0 to 10 v (rise time 5 ms) 0 to 10 v (rise time 2 s) 0 to 20 ma or 4 to 20 ma (rise time 5 ms) nominal temperature range 0 c to +60 c temperature coefficient characteristic value zero signal bridge supply voltage 0.3 %/10 k 0.3 %/10 k 0.04 %/10 k operating voltage nominal value nominal range 24 v dc 20 to 30 v dc (ripple included) current consumption 0.2 a bridge supply voltage nominal value nominal range 10 v dc 9 to 13 v dc protection class rail mounting in acc. with din en 50022 ip 00 dimensions see dimension drawing free datasheet http:///

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