|
<< Click to Display Table of Contents >> Loading Considerations |
  
|
|
<< Click to Display Table of Contents >> Loading Considerations |
|
When calculating belt tensions and power requirements, the program considers only the loading scenario as described by the user in the input data. The user must determine what cases to consider in the design of the conveyor; loading, temperature and friction multipliers are often varied to test for the extremes of tension and power requirement.
Some of the typical loading cases to consider are:
•Full loading or no loading on all flight segments often represents the most expected operating conditions.
•Full loading the inclined and level flight segments with the temperature at its expected coldest often results in the highest belt tensions and power requirements.
•Full loading the declining flight segments with the temperature at its expected warmest often results in the lowest power requirements (possibly regeneration which also maybe the largest power requirement) and perhaps some low belt tensions.
•Loading the conveyor flight-by-flight from loading point to discharge is a typical start loading sequence. Unloading the conveyor flight-by-flight from loading point to discharge is a typical stopping sequence.
•Fully loading the belt cross-section to review the impact of overloading the conveyor.
The users choice of loading cases may also be influenced by operating considerations such as loading source, potential for overloading, etc..
The standard procedure for entering the loading by flight is:
•Go to the ”Flights” tab on main screen (3rd from top).
•Select the ”Flight Input Data” tab.
•Enter the ”Percent Load” (% of design capacity) for each flight segment.
There are a number of short-cuts to selecting typical loading patterns that can be accessed from the Design Options menu.
•"Change All Flights" sub menu item changes each entree in the "Percent Loaded" column in the ”Flights” tab to the selected percent.
•The "Inclines Loaded 100%", "Declines Loaded 100%" sub menu items change the appropriate entrees in the "Percent Loaded" column in the ”Flights” tab to full loading.
•The Load On and Off sub menu activates a dialog box that initiates an automatic sequence where the conveyor loads off and then loads on. The program completes all calculations for each successive loading condition. The user can choose a lag time of one to ten seconds between each successive load-on load-off sequence.
•There are sub menu access to several loading choices for review of conveyor performance
o "100% CEMA Loading" temporarily sets the loading to maximum recommended by CEMA base on edge distance,
o"Edge-to-Edge Loading" temporarily sets the loading to a full belt with no fee edge distance,
o"Motor Nameplate Power" temporarily sets the loading to a level requiring the full nameplate power of the motors.