Beta Manual 19025(1)

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TACHOMETER FEEDBACKDIST. AUTORIZADO®MEX (55) 53 63 23 31QRO (442) 1 95 72 60MTY (81) 83 54 10 18ventas@industrialmagza.comThe RB1 and RB2 unidirectional controllers have provisions for tachometer feedback built intotheir main PC board. Since the controller requires the proper polarity tach voltage, tach feedbackcannot be used with Beta controllers which permit the motor rotation to be reversed.The electronics are designed so that a 35 VDC/1000 RPM to a 50 VDC/1000 RPM tach can beused without circuit board modification. A 7 VDC/1000 RPM tach can be used by replacing R20with a #20 AWG jumper wire. Refer to Figure 14 for the location of the resistor.R48R47Accel CapOptionD2R18C10R18R13MaxSpdR20R21Tach1 2 3 4 5 6 7Main BoardFigure 14.Unsolder R20 and install a #20 AWGuninsulated jumper wire in its place.In order to use tachometer feedback connect the DC tachometer wires to the main boardsTB2-1 and TB2-2 (observe polarity) and move the jumper from either the 90V or the 180V positionto the tach position. See Figure 15. Moving the jumper breaks the armature feedback circuitand connects the tachometer signal through scaling resistors to the error amplifier’s summingpoint.*A+MainBoardC19R19Accel CapOption+MainBoard90/180VA-180V 90VArmConnect lead toTerminal marked "Tach".Tach1 2TB1TB21 -DCTach+Figure 15.*Broken tach wires or tach coupling may cause the motor to run at a dangerously high speed.20 Doc. No. 19025 • Boston Gear ® Ratiotrol ® DC Motor Speed Control
TACHOMETER FEEDBACK (Con’t)DIST. AUTORIZADO®MEX (55) 53 63 23 31QRO (442) 1 95 72 60MTY (81) 83 54 10 18ventas@industrialmagza.comIn order to calibrate the maximum speed of the controller, follow this procedure:1. Connect a DC voltmeter (adjusted to read 90 VDC or 180 VDC) to the A+ and A- terminalsof the controller.2. Turn the max. speed pot counterclockwise.3. Turn the speed pot counterclockwise.4. Turn the IR COMP pot fully counterclockwise. (IR COMP set clockwise may causeinstability.)5. Apply power and initiate a run command.6. Turn the speed pot clockwise slowly. If the Voltmeter reading reaches or exceedsrated armature voltage, with no adjustment from the motor speed pot, shut down thecontroller and switch the tachometer wires on TB2-1 and TB2-2.7. Adjust the speed pot fully clockwise.8. Turn the max. speed pot clockwise until the voltmeter reads rated armature voltage(90 or 180V).The controller’s maximum speed pot is now calibrated so that no further adjustment isnecessary.LINE STARTINGThe standard Beta controller contains control logic which prevents the controller from restartingautomatically if the AC line is interrupted and then reapplied. This is a safety feature whichrequires the controller be manually restarted after power loss.In some applications it may be desirable to start and stop the controller by applying or removingthe AC power. This would typically be done with a contactor installed in the AC line. The logicwhich requires a manual restart after power loss may be defeated to accommodate a line startingapplication on the RB1 or RB2 chassis mount controllers. The RB3 is not a desirable controllerto receive this modification due to its contactor reversing feature.Main BoardC16R35R39R46D5R40R52R51R41R44C18Q5C9D14UC13C15C11R30R28R25R34R32R33R31C1467469 RevCut LeadInstall & Solder Cap Lead in HoleFigure 16.Doc. No. 19025 • Boston Gear ® Ratiotrol ® DC Motor Speed Control 21
Page 1 and 2: DIST. AUTORIZADO®MEX (55) 53 63 23
Page 3 and 4: TABLE OF CONTENTSDIST. AUTORIZADO®
Page 5 and 6: OPERATOR CONTROLSTable 2. Operator
Page 7 and 8: PERFORMANCE CHARACTERISTICS (Con’
Page 9 and 10: INSTALLATION AND WIRING (Con’t)DI
Page 11 and 12: INSTALLATION AND WIRING (Con’t)DI
Page 13 and 14: DIST. AUTORIZADOMODELS RB1, RB1B, R
Page 15 and 16: HALF VOLTAGE OUTPUTDIST. AUTORIZADO
Page 17 and 18: LIMIT SWITCH REVERSING (Con’t)DIS
Page 19: TORQUE CONTROL (Con’t)DIST. AUTOR
Page 23 and 24: Table 10. TroubleshootingDIST. AUTO
Page 25 and 26: RunStop56ToReversing Bd(Optional)57
Page 27 and 28: +12V R18.2K, 1/2WC21025VD112VIN4742

Beta Manual 19025(1)

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