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38
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Special case
– when a fertilizer meter gets out of order and cannot be used for
some time, the user should do the following steps:
STEP 1
- Delete the connection point of the fertilizer meter from the inputs
connections list.
STEP 2
- Set the RATIO in the table to be equal to the amount of fertilizer injected
by the specific injector within the specified pulse length. If for example the injector's
flow is 100 liter/hour then for a pulse of 5 sec the injection will be (5/3600) x 100 =
0.138 liters/pulse.
After having those steps done, the system will continue fertilizing as before (without
having to change the volumetric fert dosages) but instead of waiting for pulses from
the fertilizer meter it will generate the pulses itself based on the knowledge of the
injectors flow as supplied in step 2 above.
8.7
Filter Sites Constants
Each filter site may have the following parameters defined:
DP Delay
–
defines the period the DP
contact has to remain closed in order
for it to cause a flushing cycle to be
started.
Looping limit
–
defines the number of
consecutive flushing cycles caused by
the DP indication, after which an
"Endless looping" problem is declared.
8.7.1
What happens with the irrigation during backflushing?
This question is answered by the selection made in the last column. The options are:
Continue
– irrigation continues
Wait
– irrigation will be waiting
HLT fert
– fertilization will be halted
Notice that:
By default backflushing will start always with the first filter station on site.
However there is an option to request (through the
DEALERS
DEFINITIONS
) that the flushing will start with the filter following the one
that was the last to be flushed at the end of the previous cycle.
At the
DEALERS DEFINITIONS
it can be decided whether the DP indication
should be respected or ignored during the line filling delay.
