J&D MAnufacturing JDN4-5, Руководство пользователя

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IS255 ‐ 21A J
&D Manufacturing •
Eau Claire, WI 54701
•
1 ‐ 800 ‐ 998 ‐ 2398
• www.jdmfg.com P a g e | 27
What is the dryoff time
Now you will learn about the dryoff time. The dryoff time is how long the controller waits until it may spray
again. The cow is supposed to dryoff before she gets wet again. How quickly the cows dries off really varies
with the temperature. As it gets warmer, your cows will dryoff sooner. To accommodate this, the default
dryoff time ramps lower and lower as the temperature increases. This makes your sprinklers spray more often
as the day gets warmer.
Adjusting dryoff
The dryoff time default is 15 minutes at 70° and 5 minutes at 90°. This is what the industry feels is a good
number to begin using your system. However, if your cows are not drying in the default time, you can change
it.
To change the dryoff time, Parameter “P42” sets the 70° dryoff time. Parameter “P43” sets the 90° dryoff
time.
Effective temperature
When you have an extra hot day, and it cools at night, your cow needs extra time to cool down.
For optimum production and breeding, the JDN4 ‐ 5 calculates an effective temperature. The effective
temperature is patterned after your cow’s body temperature. It makes your fans and sprinklers run longer
after a hot day.
Effective temperature keeps a running average of the past 12 hours temperature readings. Then, if the
average is above 75°, it assumes the cows need more time to cool. This assumption, adds 5° to the ambient
temperature. This is the Effective temperature. The fans and sprinkler use it.
You can adjust the 12 hours, the 75° and 5°.
P52 is the 75°, the temperature at which it assumes cows are overheated
P53 is the 5°, how much the controller adds to the ambient°
P54 is 12 hours, how many hours of temperature readings are being considered.
C12 allows you turn the effective temperature off for the sprinklers. (See configuration menu Table 2 )
Parameter ID Description Default Min Max
P52 Running average temperature at which
controller assumes it has been extra hot
74º 1º 120º
P53 Degrees added to ambient temperature to
calculate Effective temperature
6° 0° 20°
P54 Hours of temperature readings included in
running average
12 1 24
Table 6