User's Manual - Minarik

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4Regenerative DrivesMost non-regenerative, variable speed, DC drives controlcurrent flow to a motor in one direction. The direction ofcurrent flow is the same direction as the motor rotation.Non-regenerative drives operate in Quadrant 1, and also inQuadrant 3 if the drive is reversible (Figure 3). Motors muststop before reversing direction. Unless dynamic braking isused, non-regenerative drives cannot oppose an overhaulingload, and cannot decelerate a load faster than coasting to alower speed.Regenerative drives operate in two additional quadrants:Quadrant 2 and Quadrant 4. In these quadrants, motor torqueis in the opposite direction of motor rotation.Regenerative drives can reverse a motor without contactors,switches, brake resistors, and inhibit plugs. They can alsocontrol an overhauling load and decelerate a load faster than itwould take to coast to a lower speed.The RG25U and the RG51UA are regenerative drives. Theyare uncased chassis model drives and designed to be installedin original equipment. The drives are the same electrically.The physical layout and size of these drives are different (seeDimensions section). The RG51UA includes a field supply forshunt wound motors.The RG25U and the RG51UA are half wave rectified DCregenerative drives. Therefore the maximum armature voltage
Regenerative Drives5of these drives is 75 VDC. This means that a 90 VDC motorwill only run at about 83% of rated nameplate speed.The form factor of the RG25U and the RG51UA is 1.77. Thiswill cause a higher-than-normal heating in the motorarmature. To prevent a shorter-than-normal motor life,<strong>Minarik</strong> recommends that the horsepower rating of the motorfor a given application be at least 50% greater than therequired horsepower.Figure 3. Four Quadrant Operation
Page 1 and 2: RG SeriesModels:RG25URG51UASCR, Adj
Page 3 and 4: Safety Warnings• This symbol den
Page 5 and 6: iiiCalibration 19MAX SPD . . . . .
Page 7: vTablesFig Description Page1. Line
Page 10 and 11: 2DimensionsFigure 1. RG25U Dimensio
Page 14 and 15: 6InstallationASSUMPTIONS: Minarik d
Page 16 and 17: 8 InstallationScrew terminal blockC
Page 18 and 19: 10 InstallationRG25U ConnectionsAC
Page 20 and 21: 12 InstallationRG51UA ConnectionsAC
Page 22 and 23: 14Block DiagramFigure 10. RG25U/RG5
Page 24 and 25: 16OperationBefore applying power1.
Page 26 and 27: 18 OperationRegenerative decelerati
Page 28 and 29: 20 CalibrationIf the time it takes
Page 30 and 31: 22CalibrationDBThe deadband trimmer
Page 32 and 33: 24 Application NotesOptional speed
Page 34 and 35: 26 Application NotesConnect two spe
Page 36 and 37: 28 Application NotesUse a single po
Page 38 and 39: 30 TroubleshootingMotor does not ru
Page 40 and 41: 32Replacement PartsReplacement part
Page 42 and 43: 34 Certificate of ComplianceAC Line
Page 44 and 45: 36 Certificate of ComplianceWhether
Page 46 and 47: 38Notes
Page 48: Other drives from Minarik Corporati

User's Manual - Minarik

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