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Ez guide 500 section control
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tedbear
Posted 4/7/2021 07:37 (#8937605 - in reply to #8937393)
Subject: RE: Ez guide 500 section control


Don't call it a 'gator, it's a Ranger
Artic - 4/7/2021 03:45

Use relays.


As you are aware, the logic for clutches is the opposite of that for running section valves on a sprayer. That is electricity is used to STOP a section from planting. This reversal of logic can be handled with relays.

You would need a relay for each section. The relays need to be able to handle the current requirements of the disconnect clutch which may be considerable. The relays would need to have a Normally Closed terminal. These are referred to as Single Pole Double Throw (SPDT). These relays have 5 terminals. One pair is for the coil as usual. The power handing terminals are called Common, a Normally Open (NO) and a Normally Closed (NC). This means that the Common terminal is always connected to either the Normally Open or the Normally Closed terminal. With no power to the coil, the Common and Normally Closed terminals are connected and the Normally Open terminal just "floats". With power to the coil, the internal contacts move and the Common terminal is connected to the Normally Open terminal. The Normally Closed terminal is now "floats"

One terminal of the coil would go the the section control wire that would control a spray valve. The other coil terminal would go to ground. A heavy wire from the tractor battery would lead to the Common terminal of the relay. A wire from the Normally Closed terminal would be connected to the Clutch. There would be no connection to the Normally Open terminal. The Clutch would need a good ground back to the battery.

This means that while planting, the EZ-Guide will be sending 12V out on both sections wires (which would operate both spray valves on a sprayer) but here would go to the relays causing them to be active. That means that the power coming in on the Common terminal will NOT get to the clutches. The clutches will stay engaged and planting continues. When EZ-Guide decides that a section should turn OFF, it will stop sending 12V out that section wire, the relay relaxes and the Common is connected to the Normally Closed terminal which activates the clutch and planting stops for that or both section.s

Since it is likely that you have a manual clutch control switch box in the cab already, these relays could be installed in the tractor cab so that you can reuse the existing wiring on the planter. Be certain to have a fuse or fuses involved. I would also make an overall Master Power switch for the disconnect clutch power so that the system can be disabled overnight. Otherwise you would need to leave EZ-Guide ON to keep the relays open so that the system wouldn't try to keep the clutches disengaged over night.
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