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
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