Danfoss 51 Series Service Manual

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Danfoss 51 Series Service Manual Manual pdf 22 page image

System pressure rangebar psiMaximum delta pressure 480 7000Minimum low pressure side 10 145Speed limitsFrame sizeSpeed min-1 [rpm] 060 080 110 160 250Rated speed at maximum displacement 3,600 3,100 2,800 2,500 2,200at minimum displacement 5,600 5,000 4,500 4,000 3,400Maximum speed1 at maximum displacement 4,400 4,000 3,600 3,200 2,700at minimum displacement 7,000 6,250 5,600 5,000 4,2501Contact your Danfoss representative for maximum speed at displacements between maximum and minimum displacement.Theoretical torqueFrame sizeDisplacement condition 060 080 110 160 250at maximumdisplacementN•m/bar[lbf•in/1000 psi]0.955831.287841.7510672.5615633.982428at minimumdisplacementN•m/bar[lbf•in/1000 psi]0.191170.261560.352140.513130.80486Fluid specificationsTemperature range1Calefaction °C °FIntermittent (cold start) - 40 - 40Continuous 104 220Intermittent 115 2401At the hottest point, usually the case drain port.Viscositymm2/s SUSMinimum (intermittent) 7 47Recommended operating range 12-60 70-278Maximum (cold start) 1,600 7,500Fluid cleanlinessCleanliness level and βx-ratioRequired fluid cleanliness level ISO 4406 Class 18/13Recommended βx-ratio for suction filtration β35-45=75 (β10≥2)Recommended βx-ratio for charge pressure filtration β15-20=75 (β10≥10)Recommended inlet screen size for charge pressure filtration 100 μm - 125 μmService ManualSeries 51 and 51-1 MotorsTechnical specifications22 | © Danfoss | March 2016 11008567 | AX00000013en-US0202