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72
Imms-eT and The aCC ConTroller ............................................
IMMS-ET is central control software, designed to use
a central computer to track the deficits, and schedule
irrigation to replenish only the moisture that has been
lost. The goal is to reduce or eliminate excess watering
and grow healthier plants, without constant adjustment by
the operator.
ET= Evapo-transpiration. This is a technique for
determining how much moisture has been lost from the
soil reservoir for each station (oftenzone”, or valve) of
irrigation, based on climatic data. Natural rainfall may
replenish some or all of this deficit. Automatic irrigation
will provide the balance of the moisture required to keep
plants healthy.
When ACC is in a computer central control system, it can
be used to report ET from a Hunter ET Sensor to the central
computer via IMMS control software. The computer can
use the ET information to create ET-based run times for
many controllers, including the original source controller.
IMMS-ET requires a central computer and
communications to function.
The ET Sensor does not adjust the ACC controller directly
in standalone or offline use, even though you can see the
daily ET displayed.
The computer must perform a full sync for the ET
information to be retrieved, processed, and sent back to
the controller(s).
ET Requirements:
Master Module (part 572000) version 4.0 or higher
(identified by green ET terminal, top left corner of
module, AND the presence of the ET Ready!” sticker).
If the Master Module is an older version (with a red ET
terminal, or a green one without ET Ready displayed),
the ET functions will not be displayed until the module
is updated. The first production release version of the
ET Ready master module is version 4.22.010.
ACC facepack version 4.0xx or higher.
Hunter model ET Sensor. The sensor is connected
directly to the ET terminals, with two 18 AWG/1mm
direct burial wires, color-coded for polarity. Max
distance from sensor to controller is 100" (33 m), and
this distance should not be extended. Note that the
ET Module (from Hunter ET System) is not used, with
IMMS ET. The version number of the ET Sensor needs
to be 1,50.000.
ET SETUP AND OPERATIONS
Turn dial to Advanced Features dial position. If facepack
and master module are updated to versions 4 or later, the
ET Functions selection will appear in the menu selections.
ET FUNCTIONS
The ET functions listed in Advanced Features only apply
when an optional ET Sensor is connected.
After each ET function, it is possible to press the Back
button (controller left arrow key) to return to the ET
Functions menu and select another function.
While in the Advanced Features dial position, arrow down
to "ET FUNCTIONS" and press the + button. If ET has not
been enabled yet the screen will only give you the option
of selecting ET OPERATION.
ET OPERATION
Set to YES to enable ET operation. After turning the dial to
Advanced Features and selecting ET FUNCTIONS, press
the + button with ET OPERATION highlighted. The screen
will then ask you if you want to USE ET SENSOR. If you
have an ET Sensor and a central control IMMS system,
press the + button and set to YES to enable ET operation.
This will cause the controller display to begin showing
Current ET: x.xx” in inches or millimeters, when the dial
is turned back to the Run dial position. Also, with ET
79


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