JW JW JW JIS JIS JIS CJ CJ CJ SF SF SF MC MC MC Variable Speed Drives G G G In This Section: ■■ Econoline Series HP HP HP ■■ Aluminoline Series ■■ WB Series GD GD GD ■■ Hi-Ratio Series ■■ Adjusta-Sheave Series D D D ■■ Hexadrive Series ■■ Adjustable Motor Bases T T T SP SP UJ UJ UJ ■■ Belts SP ■■ Companion Sheaves VSD VSD VSD R R R SLD SLD SLD ED ED ED www.lovejoy-inc.com 341 VSDVSD-1

CJ CJ SF SF SF CJ JIS JIS JIS JW JW JW Variable Speed Drives MC MC MC Safety Warning G G G HP HP HP GD GD GD When using Lovejoy products, you must follow these instructions and take the following precautions. Failure to do so may cause the power transmission product to break and parts to be thrown with sufficient force to cause severe injury or death. Refer to this Lovejoy Catalog for proper selection, sizing, horsepower, torque range, and speed range of power transmission products, including elastomeric elements for couplings. Follow the installation instructions included with the product, and...

Variable Speed Drives JIS CJ SF MC G Common Mounting Methods 1) Adjustable Center Drives This type of belt drive consists of one pulley and one sheave. The pulley is spring-loaded and is usually mounted on the driver shaft. The driver is most often an electric motor which is mounted on an adjustable motor base that can be moved toward or away from the driven sheave. The springs in the pulley take up any slack in the belt when an adjustment is made. HP When the base is adjusted, moving the pulley toward the sheave, the RPM at the sheave increases. Likewise, when the base is adjusted away from...

Variable Speed Drives Overview JW JW Note that the axial position of the belt on the flat-faced companion sheave changes as the drive moves through the speed range. This illustrates the need for a flat-faced companion sheave when using a wide variable speed belt and a one-side moveable variable speed pulley. JIS JIS CJ CJ The Adjustable Center Angle Mount Drive figure shows a more unusual mounting, with a one-side moveable pulley driving a grooved sheave. The motor base must be offset at an angle to keep the belt in line. MC MC An alternate mounting method may be used when the spring-loaded pulley...

Variable Speed Drives Lovejoy offers the most complete line of non-enclosed variable speed belt drives from fractional through 30 horsepower. Each component is made with the quality and reliability that Lovejoy builds into all of its power transmission products. Features JIS JIS Variable Speed Pulley Product Preview JW JW Overview Econoline Series SF SF ■■Allows the user to find the ideal speed without changing sheaves and belts. This is especially important on applications where final driven speed is critical and difficult to attain with two fixed-diameter sheaves. Speed range within the ratio...

Variable Speed Drives Overview JW JW WB Series JIS JIS Pulleys in the WB series use wide variable speed belts for the most efficient transmission of torque through the widest possible speed range. This two-side moveable pulley series offers the best possible belt alignment when used with a grooved companion sheave. WB pulleys provide maximum service when lubricated through a convenient grease fitting and offer sizes ranging from 6 to 13 inches in diameter, with the largest model capable of 15 HP. All models greater than 1 HP feature durable cast iron flanges (Models 245 and 260 are made with...

Variable Speed Drives Adjustable Center JIS Torque and Horsepower: Variable speed drives with constant torque loads can usually be selected by matching the variable speed pulley rating to that of the driver. Drive selection begins by matching the HP ratings, but final selection is based on torque, HP and RPM at the driven sheave. The application charts in this catalog specify driven speeds and torque ratings at the driven sheave for each pulley/sheave combination. JIS CJ CJ Factors to Consider JW JW Selection Process As a general rule, an adjustable center drive can attain a maximum driven speed...

Variable Speed Drives Fixed Center Selection Process JW JW Replacing a Drive Component Please keep the above steps in mind, even though they won’t all apply. JIS CJ Step 1: se the Quick Reference List on page VSD-12 and VSD-13 to U narrow down your choices based on the information you have. For example, if you know the pulley diameter and belt size, check the appropriate columns in the list and pick out all models that match. CJ Step 2 heck the dimensional and performance details from the C appropriate catalog page for the models you selected to find the best choice. In all replacement decisions,...

Variable Speed Drives Adjustable Center Example JIS CJ SF Step 5: pecify the Lovejoy Model 501 Torque Arm Bracket to prevent S rotation of the manual pulley handwheel so that it can be adjusted while the motor is running. This item is NOT required for MLA or HLA driver pulleys. Step 6: or remote control or linear actuation of the manual pulley, refer F to the appropriate section in the Econoline (MLA), Hi-Ratio, or Hexadrive (HEC, HLA) section of this catalog. Selection Examples: Adjustable Center Drives MC MC not shown in the chart, refer to the formulas in the Variable Speed Engineering Data...

Variable Speed Drives Fixed Center Example Selection Process Step 4: The belt selection chart shows 7.9 inches as the minimum distance for a 160 pulley and a 6 inch sheave. Moving across to the left in that chart, the belt for that center distance is an A33. You can see that the Model 160 pulley requires 2.7 inch travel to achieve full speed range, so the maximum center distance will be Step 5: A suitable motor base must be selected based on the NEMA motor frame size. For a 56 frame motor, there are several choices: the Model 48/56 economy base, the Model 200 tilting base, the SMB-143 steel sliding...

Variable Speed Drives Quick Reference List Selection Data Variable Speed Drives Quick Reference List-Adjustable Center Drives

Variable Speed Drives Quick Reference List Selection Data Variable Speed Drives Quick Reference List-Adjustable Center Drives Variable Speed Drives Quick Reference List-Fixed Center Drives