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Arrangement 9
Arrangement 9 fans are restricted to a maximum motor frame height. If the motor is larger than this the arrangement will not be available.
See Options-Configuration (Config ID=25)
Note that the motor is always shown with the terminal box on the side
Use the drive arrangement form to set the motor position and calculate the belt centres.
Centrix does not select drive pulleys. Most manufacturers will be using a third party program such as Fenner Select to obtain pulley sizes and belts.
If you are producing detail drawings then you should make your belt selection now.
It is most likely that your pulley selection will result in different belt centres to that calculated by Centrix. You can type in the new centres and calculate the slide rail position. An approximate maximum belt centres is shown to assist in selecting the vee drive.
Being as arrangement 9 fans generally have very small belt centres the stretch is minimal and the take up provided by the slide rails adequate.
Stability
When a motor is mounted on the side of a pedestal the fan can have a tendency to tip over because of the offset motor weight. When motors become large this can lead to a dangerous situation particularly when transporting using fork lift trucks. If the fan is to be mounted on anti vibration mounts it can often become difficult to select mounts with an even compression. Centrix estimates an angle over which the fan would tip over. The higher the tip angle (or stability angle) the more stable is the fan. Warnings are generated if the stability angle is too low.
Extendo Pedestals
When the length of the slide rail is longer than the sloping side of the pedestal an extension to the pedestal side is required.
There are two types of extended pedestals:
Type 1
Uses a plate extension (welded to the top of a folded pedestal) or a shaped side extension. Gussets are positioned behind the extension and welded to the pedestal top plate. Centrix will give a warning if these gussets interfere with the bearing housing (it must be possible to slide the housing from the shaft for maintenance).
Type 2
Uses an angle bracket welded to the side of the pedestal for the full length of the slide rail. This eliminates any problems with bearing removal but does reduce the stability angle slightly.
Check the box to set the option for using angles. This also sets the configuration option (Options-Configuration menu, Config ID=37).
Note: When trying to find stability solutions it may be an advantage to change slide rail suppliers.
It may also be necessary to modify the slide rails with Special Adjusters to give better access.
*.bgd File (Belt guard file)
Click 'NEXT" to continue or if desired, change to arrangement 1 by clicking 'Channel Base'