Special useTM 5-3895-374-24-1Unidirectional speedMeasurement of the actual motor speed with a tachogenerator allows the speed to be regulatedregulationThis being the case, automatic slip compensation depending on the load incorporated in the ALTIVARATV-452 is cancelled and replaced by the speed regulation loopWhen the motor is used in one direction only, the tachogenerator can be connected to the speedcontroller via a simple adaptation circuitUtilization safety measures- Comply with the polarities shown for the tachogenerator connections- The SN+ terminal voltage must be < + 5V- Link PN to OVN- Use the controller in the forward direction only (terminal FW)- Connect the tachogenerator using twisted cablesCAUTION: neither this adaptation circuit, nor that of the tachogenerator are isolated from thesupplyAccuracy + 0,1 % of the maximum speed for - a torque variation from 0,2 Tn to Tn,- a speed range from 1 to 50/60Calculation of R1 calculate the maximum voltage provided by the tachogeneratorEXAMPLE motor 1500 rpm at 50 Hztachogenerator 0,06 V/rpm \ U = 0,06 x 1500 x 67= 120,6 Vfrequency range 67 Hz50R2 slide in median position R1 = 1,5 x 120,6- 2 = 34 kW Use 33 kW5AdjustmentsConnect a voltmeter to the tachogenerator terminalsAdjust the R2 potentiometer to its minimum setting, in fully anti-clockwise positionStart the motor and set the maximum speed using the reference potentiometerTurn R2 clockwise until the corresponding voltage is obtained(page 3-211)
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