125Z Series Conveyors - QC Industries - #19

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QC Industries 513.753.6000 125 Z Series Drives 86 Service Factor - Chart 86-A Service Factor 5 10 20 30 40 50 60 70 Drive Sizing Technical Data The equivalent load was determined in the conveyor technical data page (page 79). To choose a gear motor combination that works best for the application, the next step is to convert that equivalent load into the torque required and size a drive based upon its use. The user must know the belt speed (in feet per minute), service factor (determined below), and the duty cycle of the application. The steps below guide the user through this process. These steps will utimately compare the torque required to move the load on the conveyor (Required Conveyor Drive Torque) and the torque the drive train is capable of producing (Supplied Drive Train Torque). 1. Calculate Required Conveyor Drive Torque (RCDT) Enter the equivalent load the drive must handle (from page 79). Divide this number by 6. The result equals the torque required for the application, or the required conveyor drive torque (RCDT). Enter RCDT on Line One. Choose the belt speed from page 89, and write down the drive train torque (DTT) for the selected speed. Please note that if you are choosing a top or bottom drive, you may use either a timing belt or a chain. The drive train torque is lower if using a timing belt. Enter the drive train torque on Line Two. Select a service class: Class I - Moderate loads with chain and sprocket or direct drive Class II - Moderate loads with belt and pulley Now select the service factor (SF) from Chart 86-A below based upon hours of operation per day and number of starts and stops per hour. Enter the result on Line Three. Divide the drive train torque (DTT) from #2 by the service factor (SF) from #3. This result equals the supplied drive train torque (SDTT). Enter the result on Line Four. Compare Line 4 (the supplied drive train torque [SDTT]) to Line 1 (the required conveyor drive torque [RCDT]). If the SDTT is equal to or greater than RCDT, then you have selected the proper drive. SDTT .. RCDT. If not, then: A) Slow down the belt speed B) Choose a wider conveyor C) Consult factory Proceed to the next page for instructions on how to use the remaining drive pages. 1. 2. Select Belt Speed & Enter Drive Train Torque (DTT) 2. 3. Select Service Class and Enter Service Factor (SF) 3. 4. Calculate Supplied Drive Train Torque (SDTT) 4. 5. Determine Functionality Starts and Stops per Hour Service Class (I or II) Hours of Operation per Day 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.6 1.5 1.4 1.3 1.2 1.1 1.0 80 90 100 24 16 8 2 2.3 2.2 2.1 2.0 1.9 1.8 1.7 1.8 1.7 1.6 1.5 1.4 1.3 1.2 Class I Class II Example: Equivalent load = 300 (per conveyor technical data page) 300 / 6 = 50.0 (RCDT) 50 FPM (From page 89 - heavy duty bottom drive - fixed speed) 87 inch lbs. of torque (DTT) Class II (using timing belt on a bottom drive) 16 hours per day with (10) starts and stops (Service Factor is 1.7) 87 / 1.7 = 51.1 inch lbs. (SDTT) RCDT = 50.8 SDTT = 51.1 51.1 .. 50.0 (Gearmotor assembly will provide adequate torque)