Danfoss Series 90 Technical Information

Also see for Series 90: Installation Service manual

Contents

Danfoss Series 90 Technical Information Manual pdf 32 page image

Pump Phasing With EDC Manual Operator (MOR)Pump MORRotation Pump FlowtroPtuOnoitatoRCW Towards ConnectorTowards Connector BAWCCP108 498EP108 496EEDC Second StageManual Over Ride (MOR)EDC Pilot Stage (PCP)W WarningUnintended MOR operation will cause the pump to go into stroke.Hydraulic Displacement Control (HDC), Option HFW WarningAvoid designing a system which puts swashplate into full stroke when control operation is blocked bycontamination.OperationThe hydraulic displacement control uses a hydraulic input signal to operate a 4-way servo valve, whichports hydraulic pressure to either side of a double acting servo piston. The servo piston tilts the cradleswashplate, thus varying the pump's displacement from full displacement in one direction to fulldisplacement in the opposite direction.The control has a mechanical feedback mechanism which moves the servo valve in relation to the inputsignal and the angular rotation of the swashplate. The hydraulic displacement control is designed so theangular position of the swashplate (pump displacement) is proportional to the hydraulic input signalpressure. Due to normal operating force changes, the swashplate tends to drift from the position presetby the machine operator. Drift, sensed by feedback linkage system connecting the swashplate to thecontrol valve, activates the valve to supply pressure to the servo piston, maintaining the swashplate in itspreset position.Features and Benefits• The hydraulic displacement control is a high gain control: With only small change of the input signal,the servo valve moves to a full open position porting maximum flow to the servo cylinder.Technical Information Series 90 Axial Piston PumpsControl Options32 520L0603 • Rev 0804 • March 2016