Operator Manual Owner manual

T23_AA_Operator Manual_2014 Revised 08/2014
Start Up & Operaon
Speed Compensaon
Speed compensaon is necessary for uniform applicaon of water. The buildup of tube on the spool gives the
spool a larger eecve circumference with each layer. With a constant speed of rotaon, each layer of tube
on the spool makes a signicant increase in the rate of sprinkler cart retracon speed during the irrigaon run.
From the beginning of the irrigaon run to the end of the run the typical speed increase of a hard-hose travel-
er is about 40%. This means that without speed compensaon, if you set the travel speed to apply 1 inch of
water at the beginning of the run, you will get only 0.6 inches at the end of the run. On the average, the depth
is only 0.8 inches. This level of uniformity is unacceptable in most cases.
To beer manage the uniformity of applicaon, the Water-Reels are equipped with a speed compensator.
The compensator slows the rotaon of the spool at approximately the same rate that the tube builds up on
the spool so the velocity of the incoming tube stays relavely constant throughout the irrigaon cycle.
The compensaon system monitors the diameter of the spool by use of a bar that rides on the tube and slows
the drive system to oset the increase in the circumference of the spool. The bar is aached mechanically to
the turbine motor or to the throle of an engine drive system.
For Cruise Control equipped machines, the Cruise Control electronically compensates the rotaon of the
spool. The Cruise Control knows the size of the Water-Reel it is controlling and knows how much tube is on
the spool. It then calculates the diameter of the spool and adjusts the rotaonal speed accordingly. The bar
that rides on the tube is not used for speed compensaon. It is used for shut-o in the event of a mis-wrap or
when the sprinkler cart reaches the machine.
The compensator systems will maintain a reasonably constant sprinkler cart retracon speed throughout the
run.
See the “Maintenance & Adjustments” secon in this manual for more informaon about adjusng the tur-
bine compensators.
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