Sistemes Electrònics Progrés s.a. AGRONIC 2500, Instruction Manual, Page: 16 / 40

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5.4.3. Latch option
The low power consumption in this option allows facilities to operate where the power is supplied by a single
battery and a solar charger that uses a small battery attached to a 2- to 10-W solar panel, thus not having to
charge it manually.
Latch electrovalve, also called of impulse, function by hydraulically locking its open or close position, con-
suming energy only in the moment they change positions.
The installer can set up the equipment to use latch electrovalves in the two or three-wire format and a 12 or
22-volt trip voltage. See the “Parameters - Installer” section [6.8.].
If installing 3-wire models, it will be necessary to incorporate a diode box to the installation to connect the
start and stop commons. This is unnecessary in 2-wire models.
2-WIRE LATCH CONNECTIONS:
One of the two wires is con-
nected to the “CR” output com-
mon and the other to the corre-
sponding output between “R1”
and “R27”.
If the electrovalve activates
hydraulically in the opposite di-
rection than the order given by
the equipment, this order will be
inverted going to “Parameters
Installer - Various” [6.8.].
3-WIRE LATCH CONNECTIONS:
This electrovalve
model has two commons;
the one for starting (nor-
mally red) will be brought
to the diode box, to one
of the terminals marked
“Start”. The stop common
(normally black) is con-
nected to a terminal
marked “Stop”; the other
wire (normally white) is
connected to the corre-
sponding output between
“R1” and “R27”.
On the other hand, it
will be necessary to con-
nect the CM start and the
CP stop commons on the
equipment to the diode
box.