3
The usable rain in the rain table can be thought of as negative ET, (or negative hold-over). When scheduled irrigation is set to occur,
the controller will subtract the negative hold-over in the rain table from the ET in the ET table, and calculate a run-time with the
reduced ET value. If the negative hold-over is greater than ET, no irrigation will occur, this will continue until all of the negative hold-
over is subtracted from ET, then irrigation will begin again. The amount of time that irrigation is reduced or halted is determined by
the rate and amount of rainfall. Usable rain is determined by the settings programmed at the Rain Bucket Setup screen
(See
Section 7 for more information about Rain Bucket settings)
.
To view the ET table and the rain table (this can only be done if the ET1 controller is in daily-ET mode), press the
STATUS
key, the
ET table will appear. Press the
REVIEW
key to toggle between each table
(See Section 10 for more information about the Status
screen).
7. Setting Up The ET1 Controller For Use In Daily-ET Mode
When programming the ET1 Controller, there are four keys which are used repeatedly, the
CHANGE
key,
UP ARROW
key,
DOWN
ARROW
key and the
ENTER
key. They are used in the following manner:
Press the
CHANGE
key to highlight an item to be changed. It is also used to move the highlighted cursor around the display to
other items (if necessary). Press the
UP ARROW
or
DOWN ARROW
Keys to make a change to the highlighted item. Press
ENTER
after making changes to proceed to the next screen.
Start by accessing the ET1 Set-Up Program. To access Set-Up, a four key code must be entered as follows. Press the
IRRIGATE
ON/OFF
key (this will not be necessary if the controller is already off). Press
STATION UP
, Press
STATION DOWN
then Press the
UP ARROW
key. The following pages describe each screen, and the settings necessary to set-up the ET1 controller in daily-ET
mode.
The ET table stores the last 28 days of ET values. In the example shown on the previous page, the ET table has a combination of
historical ET, actual real-time ET and user edited ET. The letter next to each value indicates how it got into the ET table, h=historical,
g=ET Gage and e=edited.
The upper left hand value is today’s ET, it will remain a historical number until 8:00 PM each night, at which time the controller will
place the total real-time ET from the ET Gage into that position (if an ET Gage is not attached and you are not sharing ET, the value
will remain historical). The total real-time ET value is the amount of ET that has occurred since 8:00 PM the previous night. Scheduled
irrigation occurring after 8:00 PM will use that value to calculate station run-times. At midnight all numbers will shift one place to the
right, a historical number will be placed in today’s position (upper left) and the number from 28 days ago (lower right) will be deleted.
If at the time scheduled irrigation is set to occur, there was no scheduled irrigation the previous night, the controller will combine the
ET values for the last 2 days and calculate station run-times using the total of the two values (if it had been 3 days since the last
scheduled irrigation it would combine the last 3 days of ET values and so on, for up to 28 days of total ET).
6. Rain Table
The rain table is where the controller stores rainfall values (measured in inches). The values in this table can only be generated from
a rain bucket wired to the controller, or shared using the Calsense Command Center program from a rain bucket wired to a
controller. In the example below the rain table has a combination of values. The letter next to the value indicates what the value
represents:
o=original, this value is zero which means it has not been altered, it has no effect on daily-ET
m=below minimum, the below minimum value is measured rain but it is not used to offset daily-ET.
r=usable rain, this value is rain that is used to offset daily-ET.
0.00 Rain Amounts From 10/29/2001 Back
Mon
Sun
Sat
Fri
T h u
Wed
Tue
o .00
o. 00
m .06
o .00
r .23
r .18
o. 00
o .00
o .00
o .00
o .00
o .00
o .00
o .00
o .00
o .00
o .00
o .00
o .00
o .00
o .00
o .00
o .00
o .00
o .00
o .00
o .00
o .00
( push <review> to see ET table )
Daily ET Section :
USE DAILY ET TO CALCULATE RUN-TIMES ?
NO
After Entering Set-Up, Press the
ENTER
key repeatedly to proceed through each screen until the first DAILY ET screen appears
(shown above). To enable daily-ET, Press the
UP ARROW
key to change the highlighted selection from NO to YES.
