Service Factor & Selection Procedures - DARALI

1 Service Factor & Selection Procedures Determine OutputSpeed RangeDetermine TorqueRequirements AtMax & Min RPMC alculate HPRequirements Basedon Torque RequirementsDetermineService Factor :Design HP =(Calculated HP) x ( )hp = 630258 EXAMPLE 1:1).Drive Machine: ).Operating Time: 8 hours perday, frequent ).Output Shaft Speed: 12 rpmmaximum, 3 rpm ).Running Load: 10,000 ).Heavy Shock ).Input Method: NEMA C-face,Output Connection: Sprocket.+ From the speed range above andthe rating table, we know we need toselect a variator with 87:1 ratiocycloidal reducer output. This willgive us a ~ output rpmrange. Calculate hp requirementsusing formula shown on the left:EXAMPLE 2:1).Drive Machine: ).Operating Time: 10 hours perday, frequent ).Output Shaft Speed: 600 rpmmaximum, 250 rpm ).

2 Running Load: 200 in-lbs at maxrpm, and 350 in-lbs at min ).Medium Inertial ).Input Method: Free input shaft,Output Mounting: NEMA C-Face.+ From the speed range above andthe rating table, we know we need toselect just the variator with the outputspeed range between 200~1200 hp requirements usingformula shown on the left:hp max=10,000 in-lbs x 3 rpm63025= min=10,000 in-lbs x 12 rpm63025= on the above calculation, youwould select a 5 hp unit (5> ) frompage 12 with 87:1 cycloidal complete part number would be:B17 - 87:1 - DHH - 5 ACQhp max=200 in-lbs x 600 rpm63025= min=350 in-lbs x 250 rpm63025= 5 hp variator unit is desired for thisapplication. The 3 hp unit is too smalldue to insufficient rating at Min. rpm( < ). The part number is:3 AVMR ecommended Service Factor ( )u Selection Of Service Factor - When your applications involve conditions moresevere than the rating basis of the DARALI DISCOV ariators, select the frame size having horse powerrating equal to or larger than the value obtained bymultiplying the actual load by Service Factor .

3 EXAMPLE:An application requires 2 hp to drive. However, theapplication involves medium shock load, frequentstart/stop, and frequent reversal. Based on theRecommended Service Factor ( ) chart on theright, the appropriate Service Factor to apply is the appropriate design hp is :2 hp x = hpAverage Operating HoursLoad Characteristicsper DayUp to 88 ~ 1616 ~ 24 - Uniform load and continuous operation - No - Light Inertia Load - Medium shock, intermittent operation - Frequent start and frequent - Medium inertia load - Heavy shock, intermittent operation - Frequent start and frequent - Heavy inertia loadu Simple Selection ProceduresConstructPart NumberFrom the Service Factor Chart above,we determine that is requiredfor applications running up to 8 hoursper day, and with Heavy Shock the Service Factor Chart above,we determine that is requiredfor applications running 10 hours perday, and with Medium Inertial design-max= x = design-min= x = design-max= x = design-min= x =