4 Follows Engine Speed No Over Speed w/ Over Speed Protection Protection On / Off Independently Variable 2 Speed 9 Cost Noise 7 Temperature control Efficiency TOTALS An On / Off will be most likely to fit your needs for your hydraulic fan drive system. Of course, other system parameters may override this choice. Selecting The Best System For Your Needs The system drivers shown on the "Y" axis generally provide an initial indication of the basic type of fan drive system to pursue: INSTRUCTIONS: 1. Choose your most important drivers (cost, noise, temperature control or efficiency) for determining the appropriate fan drive system. You may choose any number of these drivers. 2. Assign a number between 1 and 10 for importance to the drivers you have chosen (10 being the highest importance). 3. Place these numbers in the boxes to the left of the drivers. 4. Multiply the importance number by the number in each circuit column. (ex. check valve circuit: 5, 1, 1, 1, etc.) Then put that product into the box to the right. 5. Total the numbers in the boxes for each circuit column. The highest total represents the system that will most likely fit your needs. Matrix of criteria vs. type of hydraulic fan drive systems. Select two drivers. Follows Engine Speed No Over Speed w/ Over Speed Protection Protection On / Off Independently Variable 2 Speed Cost Noise Temperature control Efficiency TOTALS 5 1 1 1 4 2 2 2 3 3 4 4 1 5 5 5 2 4 3 3 EXAMPLE: Assuming Cost and Temperature Control are the most important drivers. Cost is ranked as a 9 and Temperature Control as a 7. (See scenario below.) 5 45 1 1 7 1 52 4 36 2 2 14 2 50 3 27 3 4 28 4 55 1 9 5 5 35 5 44 2 18 4 3 21 3 39 quality products for mechanical & fluid power jbj Techniques Limited, www.jbj.co.uk quality products for mechanical & fluid power ~ jbj Techniques Limited, www.jbj.co.uk UK distributor for Concentric Hydraulics
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