5.3.1. Connecting the power supply
Power is supplied to all models using 12-volt continuous electrical current. For installations
connected to solar panels, generators, or diesel pump motors, the equipment will be connected
to a 12 V battery. In 110 or 230-volt systems, an accessory such as a 90-230 V / 12 V (50-60 Hz)
power supplier is used to connect the equipment. Power supply socket must be easily accessi-
ble.
The power supply intake has an auto-resetting thermal fuse and is also protected against reversed polarity
and overvoltage peaks. The installation must have a separate thermo-magnetic switch to protect the Agrónic 2500;
its output is connected to the general power supply and the transformer that powers the output.
When the diesel motor is running, avoid disconnecting the battery as the alternator will boost the electrical
tension considerably and damage the Agrónic.
5.3.2. Connecting the ground connection
The terminal used for the ground wires is located next to the power supply terminals; its function is to divert to
the ground any possible electrical sparks generated by storms that can enter via the input and output cables. An
arc spark over in the internal gas discharger is produced with 90 volts or more. It is extremely important to connect
up the ground in order to completely safeguard the equipment.
The build-in model has an additional ground connection on the side of the metal box when having to divert
this to the ground.
5.3.3. Connecting the digital sensors
Both the digital sensor inputs and the relay outputs are powered externally to 12 or 24 volts. This point to the
internal wiring has optical and mechanical safety isolation.
The device contacts connected to the digital sensor inputs normally have to be open and free of any voltage.
There are six inputs, listed from D1 to D6, plus a common marked CD.
Each sensor input can occupy a function or operative, and they configured in the section “Parameters - Gen-
erals” [6.3.].
Function list:
IM Irrigation meter
FM Fertilizer meter
SC Cleaning start
TM Temporary malfunction
DM Definitive malfunction
CS Conditional stop
PS Program start
AL Alarm (only with SMS option)
5.3.4. Connecting the outputs
All the outputs are operable at either 12 or 24 volts in alternating or continuous current (do not supply voltage
higher than 30 volts).
To be operative at 24 Vac, an external transformer with a double-insulated 24 Vac output must be installed
according to UNE EN61010 standards. There is an accessory for a 230/24 Vac 50 VA transformer to connect to
the equipment.
The power supply intake for the outputs is marked “R+” and “R-“.
The solenoids on the electrovalves, relays and contactors are connected between the “CR” output common
and the corresponding output between “R1” and “R27”.
The power supplied to the outputs and digital sensors is protected by an auto-resettable thermal fuse. In the
section “Consultation - Agrónic” [10.7.] it indicates whether there is voltage for the outputs or not. When there is a
short circuit in one of the outputs, the fuse will automatically be tripped, limiting the output until the short circuit
has terminated.
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