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Farm Machinery
Precision Farming & GPS
AgOpenGPS RTK Autosteer, How to Guide for £1000
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<blockquote data-quote="Andy26" data-source="post: 9283169" data-attributes="member: 199"><p>The relay with the green line is to power the two lock valves that effectively turn the valve on/off. With no power to the lock valve the valve is isolated from the tractors steering and so safe for road use etc.</p><p>A relay is used rather than wiring direct to the lock solenoids for two reasons, first the PCB could overheat holding the two lock solenoids open for long periods and secondly and most important you can have the relays 12v supply with it's own isolation switch so you can leave the PCB powered up, but have the valve isolated with no risk of it operating when you don't want like on a public road.</p><p>The diode is to cushion the flyback of current you get when turning solenoids coils off.</p><p>Yes each solenoid only uses two of its three terminals. Like most solenoids polarity does not matter.</p><p></p><p>The pin 20, 12v+ is a 1 amp unregulated supply out of the PCB, not normally used.</p><p>The spare ground pin 21 you can use for the steer switch.</p></blockquote><p></p>
[QUOTE="Andy26, post: 9283169, member: 199"] The relay with the green line is to power the two lock valves that effectively turn the valve on/off. With no power to the lock valve the valve is isolated from the tractors steering and so safe for road use etc. A relay is used rather than wiring direct to the lock solenoids for two reasons, first the PCB could overheat holding the two lock solenoids open for long periods and secondly and most important you can have the relays 12v supply with it's own isolation switch so you can leave the PCB powered up, but have the valve isolated with no risk of it operating when you don't want like on a public road. The diode is to cushion the flyback of current you get when turning solenoids coils off. Yes each solenoid only uses two of its three terminals. Like most solenoids polarity does not matter. The pin 20, 12v+ is a 1 amp unregulated supply out of the PCB, not normally used. The spare ground pin 21 you can use for the steer switch. [/QUOTE]
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Farm Machinery
Precision Farming & GPS
AgOpenGPS RTK Autosteer, How to Guide for £1000
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