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Manual No. 679A

MINSTER

8952-574

SCRB-68

EDDY CURRENT COUPLING CONTROLS

DESCRIPTION
OPERATION
MAINTENANCE
REPAIR PARTS

MINSTER SOLID STATE CONTROLS

$5.00

Summary of Contents for SCRB-68

Page 1: ...Manual No 679A MINSTER 8952 574 SCRB 68 EDDY CURRENT COUPLING CONTROLS DESCRIPTION OPERATION MAINTENANCE REPAIR PARTS MINSTER SOLID STATE CONTROLS 5 00 ...

Page 2: ...Manual No 679A MINSTER 8952 574 SCRB 68 EDDY CURRENT COUPLING CONTROLS DESCRIPTION OPERATION MAINTENANCE REPAIR PARTS MINSTER SOLID STATE CONTROLS 5 00 ...

Page 3: ...controls will be repaired promptly at a reasonable cost If technical assistance is desired please contact the Minster Service Department DESIGN CHANGES Manufacturing methods state of the art and availabil ity of certain components may change Suppliers may discontinue production of certain devices whenever improved types become available to replace them As a result of these changes some components ...

Page 4: ...the Maximum Speed Potentiometer 9 To Adjust the Torque Limit Potentiometer 10 To Adjust Operating Point of Speed Sense Relay 10 To set Relay Operating Point 10 To Adjust the Strokes Per Minute Meter 10 Reference Out PLC analog Inputs 10 CONTROL REPLACEMENT 12 Option A Conversion from a SCRB 52 58 to a SCRB 68 12 Option B Conversion from a SCRB 42 48 to a SCRB 68 14 Option C Conversion from a SCR 2...

Page 5: ...Figure 1 SCRB 68 with cover removed COMPONENT IDENTIFICATION 4 Figure 2 SCRB 68 rear view Terminal Strip Power Switch Indicators ...

Page 6: ...ady brilliance whenever the unit is turned on The other lamps are used to indicate excitation of the eddy current coupling or brake as noted Since the eddy current coupling and brake coils are constantly being pulsed ON and OFF it is normal for the lamps to glow with varying brilliance The SCRB 68 control is usually used in conjunction with an external control in which certain preset speeds can be...

Page 7: ... constant speed motor and rotates at the speed of the motor This drum is the driving member and in prin ciple serves as a series of conductor loops as well as a magnetic flux carrier The position of the drum is such that its inner surface surrounds and partially encloses both field coil and rotor The variable speed output shaft is a part of the rotor assembly and rotates at speeds determined by th...

Page 8: ...portion to the speed of the output shaft This voltage is fed into the SCRB 68 con trol where it is converted from a frequency signal to a voltage This voltage is compared with a reference volt age so that speed control can be constantly main tained A portion of the tachometer voltage is also used to operate the strokes per minute indicator EDDY CURRENT BRAKE Eddy current drive units may be ordered...

Page 9: ...ed across the coupling and brake coils to serve as an indication of coil excitation To accurately measure the amount or presence of a small excitation voltage on the coupling or brake a D C volt meter should be used since a rather large threshold voltage is needed to light neon indicators This excita tion voltage can be signal checked between terminals 3 F2 C2 and 5 F1 C1 signal or terminals 4 B2 ...

Page 10: ...irection will insert additional resistance in the tachometer circuit NOTE The maximum speed potentiometer will in no way increase the maximum speed capabilities of the drive It will not affect trip out of motor overload relays nor will it assist in getting an inoperative control working This potentiometer should not be used as a Stop to reduce max imum speed capabilities since better arrange ments...

Page 11: ...s A D C voltmeter may be used as an indicator to show when the relay is energized Set meter range to the 0 150 volt scale attach negative probe to control terminal 16 K2 signal and positive probe to terminal 15 K1 sig nal When the relay is energized meter reading will be approximately 90 volts D C in the de energized state only about 10 V D C will be indicated To Set Relay Operating Point 1 Start ...

Page 12: ...t full speed Note also that the output voltage must be something less that 13 volts DC since it is internally lim ited to that level With the flywheel only running set the speed control to maximum speed Once full speed is obtained from the drive connect a voltmeter to the terminals on the II board Allow sufficient time when adjusting the output scaling potentiometer for output voltage stabilize Th...

Page 13: ...tion B Conversion from a SCRB 42 48 to a SCRB 68 Option C Conversion from a SCR 22 28 to a SCRB 68 WARNING VOLTAGE THAT COULD BE FATAL TO HUMAN LIFE IS PRESENT WITHIN THE ELECTRICAL CONTROL CIRCUITS ONLY AUTHORIZED EXPERIENCED PERSONNEL SHOULD ATTEMPT THE INSTALLA TION AND SERVICING OF ELECTRICAL EQUIP MENT Option A Conversion from a SCRB 52 58 to a SCRB 68 When replacing a SCRB 52 Control Unit wi...

Page 14: ...als on the SCRB 68 unit Refer to Figure 6 for wiring details NOTE A jumper must be installed between termi nals 5 and 7 on the SCRB 68 Failure to install this jumper will result in an inoperable SCRB 68 6 The fuse holder furnished should be installed as close to the 100 Volt transformer as possible Begin by drilling and tapping two 2 10 24 holes in the control panel to anchor the fuse holder Then ...

Page 15: ... 48 unit The wires will be re connected to the new unit therefore make certain the wires are labeled before disconnecting them Also the correct wire number from the wire being taken off of the SCRB 42 48 should be written into the blanks above the terminals on Figure 7 3 Loosen the four 4 mounting screws that secure the SCRB 42 48 unit to the panel just enough to permit removal of the unit Then re...

Page 16: ... top of the first fuse to terminal Y1 of the 100 Volt transformer Label this wire Y1 9 Remove the wire from terminal Y2 of the trans former and re label it 2Y2 NOTE Re label both ends of the wire Then attach the wire to the bottom side of the second fuse 10 Run a 16 ga MTW grade wire or equivalent from the top of the second fuse to terminal Y2 of the 100 Volt transformer Label this wire 1Y2 11 Aft...

Page 17: ...is different from that of earlier models This difference appears in the eddy current field coil terminology and was the result of the motor manufac turer s changing the designation of these leads from C1 C2 for clutch to F1 F2 for field Late model controls are arranged for the F1 F2 designation The reverse side of the SCR 22 terminal strip also carries the old terminology and may be turned over if...

Page 18: ...ef erence supply may lose its controlled regulation result ing in slight speed changes if the plant voltage changes If the SCRB 68 control installation is to be permanent it is suggested that the 1000 ohm speed control poten tiometer be installed INSTALLATION NOTE A troubleshooting guide is included as a part of this manual to aid technicians in restoring normal control functions should the need o...

Page 19: ... in manual 2 Check for worn speed control potentiometer or loose wiring connections between it and the control terminal strip 3 Operating drive at relatively low output speeds may cause excessive loading and resultant slowdown 4 Check for erratic tachometer feedback voltage A C between terminals 7 G1 signal and 12 G2 signal Rapidly changing voltage here may be caused by loose connections broken or...

Page 20: ...PECIFICATIONS Supply Voltage 100 125VAC Power 900W Frequency 48 to 62 Hz Input Output Characteristics Coupling 90VDC 115VDC 900W Brake 90VDC 115VDC 900W Tachometer 30 60VAC 300 800Hz Relay Output 110VDC 200mA Miscellaneous Dimensions L D H 231mm 9 125 in 140mm 5 5 in 130mm 5 125 in Temperature Range 0 C to 60 C 32 F to 140 F 19 VOLTAGE GUIDE TERMINALS FUNCTION VOLTAGE REQUIRED WITH DRIVE RUNNING 1...

Page 21: ...ADDITIONAL COMMENTS 20 ...

Page 22: ......

Page 23: ...MMC0311 MINSTER The Minster Machine Company Minster Ohio 45865 U S A Phone 419 628 2331 Fax 419 628 3517 Distributors strategically located throughout the world ...

Page 24: ...MMC0311 MINSTER The Minster Machine Company Minster Ohio 45865 U S A Phone 419 628 2331 Fax 419 628 3517 Distributors strategically located throughout the world ...

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