Danfoss 51 Series Service Manual

Also see for 51 Series: Service Kit Instructions Service manual Repair instructions Service manual Service manual

Danfoss 51 Series Service Manual Manual pdf 17 page image

Speed sensor location SAE / DIN flange motorsSpeed sensorMagnetic ringPistonP100 200EThe SAE and DIN flange motors use a flat end speed sensor. Cartridge flange motors use a conical endspeed sensor.ControlsOverviewThere are three basic categories of controls available for Series 51 and Series 51-1:• Two-position controls• Pressure -compensator controls• Proportional controls (Series 51 only)Two-position controlsTwo-position controls shift the motor to only two discrete positions:• maximum displacement• minimum displacement.Control input may be either by hydraulic or electrical signal. To change motor displacement, the controlroutes pilot pressure to one end of the servo piston while draining the other. Series 51-1 controls maydirect pilot pressure to both ends of the servo simultaneously, allowing the differential area of the pistonto stroke the motor to minimum angle.Some two-position controls are available with a Pressure Compensator OverRide (PCOR) feature.The PCOR feature allows normal 2-position control while causing the motor to increase displacementwhen system pressure reaches a set level due to load. The pressure compensator portion of the controloverrides the minimum displacement position commanded by the control input signal. PCOR controlsare available with brake pressure defeat to prevent the pressure compensator from operating duringdynamic braking.Complete functional description, maintenance, and repair procedures for 2-position controls are coveredin detail in these supplements to this manual:• 11009442 Series 51 Hydraulic and Electrohydraulic Two-position ControlsTypes: N2, HZ, E1-E2, F1-F2, G1-G2, S1Service ManualSeries 51 and 51-1 MotorsOperation© Danfoss | March 2016 11008567 | AX00000013en-US0202 | 17