Control Group

The electrical control group comprises an electrical pressure regulator, an electrically operated main shut-off valve, a pressure gauge and a pressure filter mounted on the left front side of the machine.

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The pressure regulator (A) has three functions:

• Setting the required spraying pressure
• Maintaining the set pressure at a constant level
• Safety valve

The pressure regulator has a capacity of 300 liters/min. and works indirectly via a diaphragm, so that the pressure can be set very accurately within a range of 0- 15 bar.

Never set the pressure higher than 15 bar, due to the maximum permissible pressure of the machine.

The pressure regulator is fitted with a 12V electrical motor to allow for remote control. On the control panel, the working pressure can be raised or lowered by setting the AUTO/MAN toggle switch (3) to manual mode (MAN) and by raising or lowering the pressure by pushing switch 2 up (+) or down (-).

A damaged diaphragm or incorrect fitting of a diaphragm will result in leakage. This becomes apparent when liquid flows out of the leakage hole (B) on the spring holder.

Operation of the main shut-off valve takes place from the control box in the cab. The main shut-off valve is an electrically operated ball valve (C).

When the MASTER switch "M" is in the open position (switch 25 up), the liquid is pumped at the set pressure via the pressure filter to the boom section valves. The liquid not sprayed out is returned to the solution tank via the pressure regulator and return line. The red LED on the control box above the Master valve is ON.

When the MASTER switch "M" is in the closed position (switch 25 down), the liquid is circulated at low pressure and flows back to the solution tank. The LED on the control box above the Master valve is OFF.

A-Pressure regulator
B-Leakage hole
C-Electrically operated ball valve

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The spraying pressure is shown digitally on the GreenStar 2 display. The machine can be fitted with a digital pressure sensor (A), which is mounted to the rear centre of the spray boom.

If the application rate control system is fitted with a flow sensor instead of a pressure sensor, the calculated spraying pressure will be shown on the display.

Another option is a pressure sensor and a flow sensor installed on the machine. In this case the measured pressure of the pressure sensor will be shown on the display. Also refer to GreenStar 2™ Sprayer Control System.

A-Digital pressure sensor
B-Flow sensor
C-Pressure gauge connection

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The analogue pressure gauge (A) fitted to the front of the machine is for monitoring purposes only. The pressure gauge is located near the pressure regulator and displays the pressure at that point (in bar). The spraying pressure given on the GreenStar 2 display is very accurate and is always lower during spraying due to pressure losses in the line. Depending on the output, the spraying pressure at the nozzles will always be slightly lower than the pressure on the display due to pressure losses in the lines and the presence of diaphragm non-return valves in the nozzle holders. Make allowances for this when calibrating the spray nozzles.

A glycerine damped pressure gauge with a 100 mm housing and a phased scale of 0- 10/25 bar is fitted as standard. The scale is divided into four color zones. Make sure the pressure is always set in the green zone (1-10 bar). From 0-10 bar, the scale is divided into steps of 0.2 bar (accuracy: 1.0% of 10 bar, i.e. 0.1 bar).

A-Analogue pressure gauge

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The pressure filter (A) is important for spraying without blockages, and provides the last central filtering before the liquid is moved to the nozzles.

A 50 mesh filter (red) is fitted as standard. This filter has a mesh width of 280 micron (0.28 mm) and is suitable for flat fan nozzles of the 02 type (or comparable sizes) and larger. A finer 80 mesh filter (blue) can be fitted for smaller nozzles. This filter has a mesh width of 180 micron (0.18 mm).

The filter must be cleaned regularly (in any case after each use; see also the safety guidelines from chemical manufacturer). This can be done simply by unscrewing the filter cup (C) and removing the filter element (B). Regular cleaning of the filter will prevent silting up, which could break the filter.

NOTE: Please refer to recommendation on label of chemical product used for cleaning and operator safety.

A-Pressure filter
B-Filter element
C-Filter cup

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The pressure filter (A) is important for spraying without blockages, and provides the last central filtering before the liquid is moved to the nozzles.

A 50 mesh filter (red) is fitted as standard. This filter has a mesh width of 280 micron (0.28 mm) and is suitable for flat fan nozzles of the 02 type (or comparable sizes) and larger. A finer 80 mesh filter (blue) can be fitted for smaller nozzles. This filter has a mesh width of 180 micron (0.18 mm). To activate the continuous rinsing process during spraying open valve (C). This enables the liquid to flow into the tank. If the machine is equipped with VRS there is a non return check valve mounted in the return line.

The filter must be flushed and cleaned regularly (in any case after each use; see also the safety and rinsing guidelines from the chemical manufacturer). This can be done simply by unscrewing the filter cup (B) and removing the filter element out of the cup. Regular cleaning and opening the valve of the filter will prevent silting up, which could break the filter.

NOTE: Please refer to recommendation on label of chemical product used for cleaning and operator safety.

A-Pressure filter
B-Filter cup
C-Valve

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