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Variable Speed Drives Fixed Center

Selection Process

Replacing a Drive Component

Step 2 Check the dimensional and performance details from the appropriate catalog page for the models you selected to find the best choice. In all replacement decisions, it is very important to consider the pulley style – 1, 2, or 3 (see page VSD-12) to get the best possible fit to the existing drive. Do NOT try to use a Lovejoy variable speed pulley with a belt that is not designed to drive. You will not attain the advertised speed range, and you may experience premature wear. Please keep the above steps in mind, even though they won’t all apply.

Replacing a Variable Speed Pulley

Step 1: Use the Quick Reference List on page VSD-12 and VSD-13 to 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.

Replacing a Companion Sheave Replacing an Adjustable Motor Base

Step 1: For a grooved sheave, determine the outside diameter of the sheave and the belt size. For a flat-faced sheave, measure the outside diameter and the face width. Step 1: Determine the NEMA motor frame size or motor foot-mount dimensions. Step 2: Select the correct sheave from catalog pages VSD-65 and VSD-66. Step 2: Step 3: Select the correct base from the catalog pages VSD-62 through VSD-64. If it is NOT a Lovejoy base that is being replaced, be aware that the base mounting bolt locations may not match, and new holes may need to be drilled to mount the Lovejoy base to the machine. Check overall dimensions to be sure the base will fit the allotted space. Step 3: Replace the bushing (see page SF-17). Step 1: Using the horsepower, driver speed, and required driven speed range information from above, select the appropriate series from Econoline, WB, Hi-Ratio, or Hexadrive. Step 2: Select the correct manual driver pulley by choosing the model that is rated for your motor HP and speed. Be sure the pulley comes with a bore size that fits your motor shaft. Contact Lovejoy Customer Service for the availability of non-standard bores. Step 3: Using the application chart for the pulley you have selected, choose a driven spring-loaded pulley that will handle the HP and torque requirement. Note that all Lovejoy fixed center drives are rated as constant horsepower from the base speed (motor speed) to the maximum driven speed. They are constant torque drives from base speed down to minimum driven speed. The ratings shown are those at the driven pulley.

Selecting a Fixed Center Belt Drive

To select a fixed center package, it is necessary to know the following information:Horsepower and RPM of driver unit. â–  â–  Required speed range at the driven shaft. â–  Torque requirement at the driven shaft. â–  Shaft center-to-center distance. â–  Driver AND driven shaft sizes. â–  The relationship between driver and driven shafts (C vs. Z mount). Refer to the drawing below.Lovejoy makes four types of fixed center drives: Econoline, WB, Hexadrive, and Hi-Ratio. The proper series to use depends on the horsepower rating, the required speed range, and the belt preference, as well as space and economic considerations. Once you have the information listed above and have selected the appropriate series, use the following procedure: Typical Fixed Center DriveC and Z Mounting
VSD Continued

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