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FEEDER information display
Recycle Weighed by Recycle Scale Conveyor - TM-5-3895-374-10_216

TM-5-3895-374-10 Paving Machine Bituminous Material: Crawler Mounted Diesel Engine Driven Manual
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TM 5-3895-374-10 ......................................................................................................................................................FEEDER information display NOTE:   This computer is compatible with many different types of feeder control and measuring equipment.  Not all of the following options will apply to any given equipment. See also the section on FEEDER OPTIONS. Volumetric Determined by Desired Rate  __________________________ If the rate is shown in parenthesis, i.e.  (xxx), then the rate is not measured but is the desired rate as determined from the target  rate  and  mix  formula.    All  calculations  based  on  bin  rate  such  as  material  usage  totals  and  material  blends  are calculated from this derived value.  This is the most basic operational scheme and no simpler backup option is provided. If the  rate  shown  is  not  in  parenthesis,  it  is  the  rate  as  actually  measured  by  the  equipment  described  on  the  FEEDER OPTIONS sheet.  The material total accumulated for this bin is calculated from this measured rate. Volumetric Measured by Motor Tach _____________________________ This scheme uses a tachometer mounted directly on the feeder drive motor.  Most usually this is a pulse pickup and ’gear’ mounted on the motor ’C’ face.  The output of this tach is assumed to be directly proportional to the volumetric output of the feeder.  This approach assumes there is no slippage in the drive or feeder belt.  This scheme sometimes uses the Desired Rate approach as a backup option. Volumetric Measured by Tailshaft Tach ___________________________ Some systems use a tachometer mounted on the feeder tail shaft.  This tachometer measures the feeder belt speed and not the motor speed so is unaffected by minor drive and feeder belt slippage.  To operate properly it is important that the tachometer  be  mounted  securely  to  the  tailshaft,  be  properly  restrained  from  extraneous  movement  and  run  smoothly without excessive wobble.  This scheme often uses the Desired Rate approach as a backup option. Weighed by Feeder Mounted Scale ______________________________ Some  systems  incorporate  a  belt  conveyor  scale  directly  in  the  feeder  belt  and  cojnstantly  weigh  the  feeder  output.    To convert  this  weight  signal  to  tons  per  hour  a  feed  belt  speed  pickup  is  also  required.    This  speed  pickup  may  be  either motor mounted or tailshaft mounted.  This scheme usually has some other simpler approach as a backup option. page F - 13 SYSTEMS Equipment Corp 8/31/89 Page (7)







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