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<< Click to Display Table of Contents >> Breakaway Torque |
  
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<< Click to Display Table of Contents >> Breakaway Torque |
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The percent torque required for starting a conveyor from zero speed is shown in the Drive table as the Required Breakaway Torque. To get the % torque for a fully loaded conveyor, the conveyor loading defined it the Profile table need to be fully loaded. If the selected conveyor load is empty, then it will show the required breakaway torque for an empty conveyor.
The Average Starting Torque can be an input or an output. For example, if input is a 30 second starting time, then BA will output the average starting torque required to achieve a 30 second start time. Conversely, if input is 150% average starting torque, BA will output the starting time if is was to average 150% torque.
The user should try to get as much information possible from the motor manufacturer (and other component manufacturers for fluid couplings, VFDs, etc) and figure out what torque is available. Typically for VFDs (variable frequency drives) the max torque is 150%, so the required breakaway torque should be less than 150% and probably less than 135% to give some safety factor. For fluid couplings, the max torque can vary a lot, so be sure to ask the fluid coupling manufacturer for all the information. For across-the-line, or directly coupled starting, to be safe assume the pull-up (lowest) torque of the motor be greater than the breakaway torque.
The Belt Analyst calculation is based on a static analysis of average starting toques. Dynamic Analyst uses an inputted motor torque curve and defined starting algorithm to refine this evaluation.
Belt Analyst utilizes the Breakaway Friction Multiplier included in the Defaults > Drive table. The Required Breakaway value will turn yellow as a warning if the value is greater the Peak Motor Torque on the same table.