Topcon A2677 manual Different Valve Types

X20 Sprayer Reference Manual

Different Valve Types

There are three different valve types, which are:

•2-Wire Valve—this refers to an electric section, dump or Regulator Valve

The valve is driven by an electric motor that is able to rotate in both directions. Two wires are connected to this type of valve from the controller. To rotate the motor 12V is applied to one of the wires whilst GND is applied to the other. When opposite voltage is applied to the two wires the motor will rotate in the opposite direction.

Common terms for this system are Reverse Polarity or Bi-Directional.

•3-Wire Valve—this refers to an electric section, dump or Regulator Valve

The valve is driven by an electric motor that is able to rotate in both directions. Unlike the 2-wire valve, the 3-wire valve has in built changeover relays that change the motor direction, depending on whether 12V or 0V is applied to the signal wire.

Contsant 12V and GND are required in addition to the signal wire.

•Solenoid Valve—this refers to electromagnetic coil type valves.

Solenoid Valves usually consist of a coil, that when exposed to voltage produces a magnetic field. The magnetic field draws a needle against a spring away from its seat, to allow liquid to flow.

A2677 Rev 1.5 5-25