Beta Manual 19025(1)

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MAINTENANCEDIST. AUTORIZADO®MEX (55) 53 63 23 31QRO (442) 1 95 72 60MTY (81) 83 54 10 18ventas@industrialmagza.comMaintenance consists of keeping the controller clean and dry. Refer to maintenance instructionssupplied by the motor manufacturer. If the motor does rotate, check the fuse on top of thecontroller. The fuse type is shown on the controller data label.CAUTIONSUBSTITUTE FUSES CAN CAUSE CONTROLLER DAMAGE.WARNINGBE SURE THE AC INPUT POWER IS REMOVED BEFORE WORKING ON THECONTROLLER. High voltage within the controller can cause electric shockresulting in personal injury or loss of life.Beta ModificationsFull Wave FieldTable 7.The standard half wave field supply may be converted to a full wave field supply. This modificationdoubles the field voltage that would otherwise be available. The table below shows therelationship.Standard Half Wave Full Wave Field VoltageAC Line Volts Field Voltage After Modification115 VAC 50 VDC 100 VDC230 VAC 100 VDC 200 VDCIn order to obtain the increased filed voltage, two diodes must be installed in the PC board.These diodes together with the two diodes in the power bridge form a full wave rectifier circuit.Figure 8 shows the location of the diodes. Observe the orientation of the band marking on thedevices when installing them. Use IN5399 diodes or similar 1.5A, 1000V diodes. Remove theexisting jumper as shown in Figure 8 and install #20 insulated wire between the holes connectedby the dotted line.Install Two Diodes(Note orientation ofband on diode)R8R9R10R11D17Main BoardD16R12R13 HighR14VoltageField OptionE4 E5 E6 E7BlkYelTB1Install and solder wirebetween holes connectedby dotted line.A+ A- F- F+ L1Figure 8. Full Wave FieldUnsolder wire fromPC board.14 Doc. No. 19025 • Boston Gear ® Ratiotrol ® DC Motor Speed Control
HALF VOLTAGE OUTPUTDIST. AUTORIZADO®MEX (55) 53 63 23 31QRO (442) 1 95 72 60MTY (81) 83 54 10 18ventas@industrialmagza.comWhen the Beta controller is calibrated for 230 VAC, the armature voltage is adjustable from 0to 180 VDC. It is possible to reduce this range to 0 to 90 VDC by moving the feedback jumperon the main board from its 180V position to the 90V position. This effectively doubles the armaturefeedback signal to the controller’s error amplifier, thus reducing the armature voltage byhalf. Although the armature voltage is reduced, the field voltage remains at 100 VDC.Furthermore, the controller must now be calibrated for horsepower as if it were a 115 VAC unit.Because the armature voltage is reduced by half, the gain of the system has doubled. Thismay cause instability at certain loads or speeds. Another consideration is the controller/motorform factor. The form factor is much higher when obtaining 90 VDC from a 230 VAC controllerthan it would be if the 90 VDC were obtained from 115 VAC. This will increase motor heating tosome extent and may cause commutation difficulties. Therefore, the suitability of this mode ofoperation should be confirmed by testing or consulting the motor manufacturer.INCREASED ACCELERATION TIMEThe time it takes the Beta controller to bring the motor to full speed may be increased from thestandard 0.3 second time to a maximum of 2.5 minutes. This is done by installing a 25V, axiallead electrolytic capacitor on the PC board. The value of the capacitor in microfarads determinesthe time the motor will take to reach full speed. The following table shows standard valuesof capacitors and the acceleration time obtained with each. The time listed is approximatedue to the tolerance of the capacitor and is specified at the point the armature voltage reaches95% of its final value. Although values larger than 1000 MFD may be used, it is not recommended.Larger values may prohibit the controller from reaching full speed.Table 8. Capacitor Values/AccelerationCapacitance (MFD) Time (SEC.)30 550 8100 15150 23200* 301000* 2.5 min.*These caps may not fit into the space provided on the PCboard. In this case the caps leads may be insulated and bent sothat they reach the holes provided.Capacitor values for other acceleration times may be obtained by using the following formula:(6.66 x Time) -2 is approximate equal to capacitance in MFDSelect a standard capacitor value which is close to the calculated result.Example:Compute the value of capacitance required for an acceleration time of two seconds:(6.66 x 2) -2 = 11.3 MicrofaradsTherefore, a 10 MFD capacitor would be installed on the Beta controller’s main board.Doc. No. 19025 • Boston Gear ® Ratiotrol ® DC Motor Speed Control 15
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: DIST. AUTORIZADOMODELS RB1, RB1B, R
Page 17 and 18: LIMIT SWITCH REVERSING (Con’t)DIS
Page 19 and 20: TORQUE CONTROL (Con’t)DIST. AUTOR
Page 21 and 22: TACHOMETER FEEDBACK (Con’t)DIST.
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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